advanced calculator

[Maya Naga]

hi friends...
am now preparing a calculator software.. i like to add some advanced things like calendar view, graphs etc..
can you give some idea about overall design and related functions???
thank you

[Maneesh Godbole]

For calender view I prefer JCalendar You might find others if you Google.
For graphs and charts I prefer JFreeChart Again, you will find more if you Google.
Without knowing what your advanced calculator is supposed to do, it is very difficult for us to provide ideas.

[Maya Naga]

thanks Maneesh... actually i have already included arithmetic and logic functions.
i just need to enhance it little bit by showing calenders while clicking an button in calculator.
thats it.

[Ulf Dittmer]

I'm a bit confused: what is the use of a calendar in a calculator?

[Maneesh Godbole]

Maybe date/time calculations?

[Maya Naga]

i said it was just an additional thing like viewing date and time..

[Maya Naga]

hi.. i want to display the actual formula for the calculations done by the user in a text field..
do any one have idea about it..

[Maya Naga]

help me

[Ulf Dittmer]

What is "the actual formula for the calculations"? Regular calculators only display numbers; more advanced ones display anything the user types (like parentheses, operators etc.) - is the latter what you intend to do? If so, just put anything in the text field the user types. You can use a KeyListener for that.

If you meant something else, please provide more detail.

[Maya Naga]

import java.awt.*;
import java.awt.event.*;
import java.awt.Dimension;
import javax.swing.ImageIcon;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.JLabel;

public class calculator extends JFrame implements ActionListener

{
// variables declaration
JLabel frmlbl;
double temp,temp1,result,a,b;
static double m1,m2;
int k=1,x=0,y=0,z=0;
char ch;
String com="";
JTextField jtx;
JTextArea txt;
JButton one,two,three,four,five,six,seven,eight,nine,zero,clr,pow2,pow3,exp;
JButton plus,min,div,lg,rec,mul,eq,plmi,poin,mr,mc,mp,mm,sqrt,sin,cos,tan;
JMenuBar bar;
JMenu view;
JMenuItem calendar,exit;
JRadioButtonMenuItem standard,scientific;
JSeparator jp;
ButtonGroup bg;
Container cont;
JPanel textPanel,syntpanel,buttonpanel,formpanel;

// constructor
calculator()
{
cont=getContentPane();
cont.setLayout(new BorderLayout());
JPanel textpanel=new JPanel();
//JPanel lblpanel=new JPanel();
Font font=new Font("Arial",Font.PLAIN,18);
ImageIcon icon = new ImageIcon("home/ambiga/java/Java Programs/Java Theoritical Notes-Good/course/course/week9/sun.gif ");

textpanel.setLayout(new GridLayout(0,2,3,2));
frmlbl=new JLabel(" ",icon, JLabel.RIGHT);
frmlbl.setFont(font);
frmlbl.setHorizontalAlignment(SwingConstants.CENTER);
frmlbl.setBackground(Color.white);
frmlbl.setForeground(Color.black);
frmlbl.setBorder(BorderFactory.createLineBorder(Color.black));
frmlbl.setOpaque(true);
//frmlbl.setIcon(new javax.swing.ImageIcon("home/ambiga/java/Java Programs/Java Theoritical Notes-Good/course/course/week9/sun.gif"));

jtx=new JTextField(17);
jtx.setFont(font);
jtx.setHorizontalAlignment(SwingConstants.CENTER);
jtx.setBackground(Color.black);
jtx.setMaximumSize(jtx.getPreferredSize() );
jtx.setForeground(Color.orange);
//jtx.setBorderPainted(false)
jtx.setBorder(BorderFactory.createLineBorder(Color.black));


//adding actions to the keys
jtx.addKeyListener(new KeyAdapter()
{
public void keyPressed(KeyEvent keyevent)
{
char c=keyevent.getKeyChar();
if(c>='0' && c<='9')
{
}
else
{
keyevent.consume();
}
}
});
//lblpanel.add(frmlbl);
textpanel.add(frmlbl);
textpanel.add(jtx);

buttonpanel=new JPanel();
buttonpanel.setLayout(new GridLayout(5,0,2,2));

syntpanel=new JPanel();
syntpanel.setLayout(new GridLayout(6,0,2,1));

bar=new JMenuBar();
view=new JMenu("View");
view.setMnemonic(KeyEvent.VK_V);

standard =new JRadioButtonMenuItem("Standard",true);
standard.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,ActionEvent.ALT_MASK));
standard.addItemListener(new radiohandler());

scientific =new JRadioButtonMenuItem("Scientific");
scientific.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,ActionEvent.ALT_MASK));
scientific.addItemListener(new radiohandler());

//using separator between design and exit
jp=new JSeparator();

exit=new JMenuItem("Exit");
exit.setMnemonic('E');
exit.addActionListener(this);

// creating button groups
bg=new ButtonGroup();
bg.add(standard);
bg.add(scientific);
view.add(standard);
view.add(scientific);
view.add(jp);
view.add(exit);
bar.add(view);
setJMenuBar(bar);

//standard

mr=new JButton("MR");
mr.setForeground(Color.orange);
mr.setBackground(Color.DARK_GRAY);
mr.setBorderPainted(false);
buttonpanel.add(mr);
mr.addActionListener(this);

seven=new JButton("7");
seven.setForeground(Color.orange);
seven.setBackground(Color.GRAY);
seven.setBorderPainted(false);
seven.setOpaque(true);
buttonpanel.add(seven);
seven.addActionListener(this);

eight=new JButton("8");
eight.setForeground(Color.orange);
eight.setBackground(Color.GRAY);
eight.setBorderPainted(false);
buttonpanel.add(eight);
eight.addActionListener(this);

nine=new JButton("9");
nine.setForeground(Color.orange);
nine.setBackground(Color.GRAY);
nine.setBorderPainted(false);
buttonpanel.add(nine);
nine.addActionListener(this);

clr=new JButton("AC");
clr.setForeground(Color.orange);
clr.setBackground(Color.GRAY);
clr.setBorderPainted(false);
buttonpanel.add(clr);
clr.addActionListener(this);

mc=new JButton("MC");
mc.setForeground(Color.orange);
mc.setBackground(Color.DARK_GRAY);
mc.setBorderPainted(false);
buttonpanel.add(mc);
mc.addActionListener(this);

four=new JButton("4");
four.setForeground(Color.orange);
four.setBackground(Color.GRAY);
four.setBorderPainted(false);
buttonpanel.add(four);
four.addActionListener(this);

five=new JButton("5");
five.setForeground(Color.orange);
five.setBackground(Color.GRAY);
five.setBorderPainted(false);
buttonpanel.add(five);
five.addActionListener(this);

six=new JButton("6");
six.setForeground(Color.orange);
six.setBackground(Color.GRAY);
six.setBorderPainted(false);
buttonpanel.add(six);
six.addActionListener(this);

mul=new JButton("*");
mul.setForeground(Color.orange);
mul.setBackground(Color.GRAY);
mul.setBorderPainted(false);
buttonpanel.add(mul);
mul.addActionListener(this);

mp=new JButton("M+");
mp.setForeground(Color.orange);
mp.setBackground(Color.DARK_GRAY);
mp.setBorderPainted(false);
buttonpanel.add(mp);
mp.addActionListener(this);

one=new JButton("1");
one.setForeground(Color.orange);
one.setBackground(Color.GRAY);
one.setBorderPainted(false);
buttonpanel.add(one);
one.addActionListener(this);

two=new JButton("2");
two.setForeground(Color.orange);
two.setBackground(Color.GRAY);
two.setBorderPainted(false);
buttonpanel.add(two);
two.addActionListener(this);

three=new JButton("3");
three.setForeground(Color.orange);
three.setBackground(Color.GRAY);
three.setBorderPainted(false);
buttonpanel.add(three);
three.addActionListener(this);

min=new JButton("-");
min.setForeground(Color.orange);
min.setBackground(Color.GRAY);
min.setBorderPainted(false);
buttonpanel.add(min);
min.addActionListener(this);

mm=new JButton("M-");
mm.setForeground(Color.orange);
mm.setBackground(Color.DARK_GRAY);
mm.setBorderPainted(false);
buttonpanel.add(mm);
mm.addActionListener(this);

zero=new JButton("0");
zero.setForeground(Color.orange);
zero.setBackground(Color.GRAY);
zero.setBorderPainted(false);
buttonpanel.add(zero);
zero.addActionListener(this);

plmi=new JButton("+/-");
plmi.setForeground(Color.orange);
plmi.setBackground(Color.GRAY);
plmi.setBorderPainted(false);
buttonpanel.add(plmi);
plmi.addActionListener(this);

poin=new JButton(".");
poin.setForeground(Color.orange);
poin.setBackground(Color.GRAY);
poin.setBorderPainted(false);
buttonpanel.add(poin);
poin.addActionListener(this);

plus=new JButton("+");
plus.setForeground(Color.orange);
plus.setBackground(Color.GRAY);
plus.setBorderPainted(false);
buttonpanel.add(plus);
plus.addActionListener(this);

rec=new JButton("1/x");
rec.setForeground(Color.orange);
rec.setBackground(Color.DARK_GRAY);
rec.setBorderPainted(false);
buttonpanel.add(rec);
rec.addActionListener(this);

sqrt=new JButton("sqrt");
sqrt.setForeground(Color.orange);
sqrt.setBackground(Color.DARK_GRAY);
sqrt.setBorderPainted(false);
buttonpanel.add(sqrt);
sqrt.addActionListener(this);

lg=new JButton("log");
lg.setForeground(Color.orange);
lg.setBackground(Color.DARK_GRAY);
buttonpanel.add(lg);
lg.setBorderPainted(false);
lg.addActionListener(this);

div=new JButton("/");
div.addActionListener(this);
div.setForeground(Color.orange);
div.setBackground(Color.GRAY);
div.setBorderPainted(false);
buttonpanel.add(div);

eq=new JButton("=");
eq.setForeground(Color.orange);
eq.setBackground(Color.GRAY);
eq.setBorderPainted(false);
buttonpanel.add(eq);
eq.addActionListener(this);

//scientific
sin=new JButton("Sin");
sin.setForeground(Color.white);
sin.setBackground(Color.gray);
sin.setBorderPainted(false);
syntpanel.add(sin);
sin.addActionListener(this);

cos=new JButton("Cos");
cos.setForeground(Color.white);
cos.setBackground(Color.gray);
cos.setBorderPainted(false);
syntpanel.add(cos);
cos.addActionListener(this);

tan=new JButton("Tan");
tan.setForeground(Color.white);
tan.setBackground(Color.gray);
tan.setBorderPainted(false);
syntpanel.add(tan);
tan.addActionListener(this);

pow2=new JButton("x^2");
pow2.setForeground(Color.white);
pow2.setBackground(Color.gray);
pow2.setBorderPainted(false);
syntpanel.add(pow2);
pow2.addActionListener(this);

pow3=new JButton("x^3");
pow3.setForeground(Color.white);
pow3.setBackground(Color.gray);
syntpanel.add(pow3);
pow3.setBorderPainted(false);
pow3.addActionListener(this);

exp=new JButton("Exp");
exp.setForeground(Color.white);
exp.setBackground(Color.gray);
exp.setBorderPainted(false);
syntpanel.add(exp);
exp.addActionListener(this);

cont.add("Center",buttonpanel);
cont.add("North",textpanel);

this.setTitle("Swing Calculator");
this.setSize(450,250);
this.setLocation(300,300);
this.setResizable(true);
this.setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Clear();
}
class radiohandler implements ItemListener
{
public void itemStateChanged(ItemEvent ie)
{
AbstractButton button=(AbstractButton)ie.getItem();
String label=button.getText();

if(label.equals("Standard"))
{
cont.remove(syntpanel);
validate();
}
if(label.equals("Scientific"))
{
cont.add("West",syntpanel);
validate();
}

}
}
public void actionPerformed(ActionEvent e)
{
String s=e.getActionCommand();
if(s.equals("Exit"))
{
System.exit(0);
}
if(s.equals("1"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"1");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"1");
z=0;
}
}
if(s.equals("2"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"2");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"2");
z=0;
}
}
if(s.equals("3"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"3");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"3");
z=0;
}
}

if(s.equals("4"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"4");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"4");
z=0;
}
}

if(s.equals("5"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"5");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"5");
z=0;
}
}

if(s.equals("6"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"6");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"6");
z=0;
}
}

if(s.equals("7"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"7");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"7");
z=0;
}
}

if(s.equals("8"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"8");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"8");
z=0;
}
}

if(s.equals("9"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"9");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"9");
z=0;
}
}

if(s.equals("0"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"0");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"0");
z=0;
}
}

if(s.equals("AC"))
{
jtx.setText("");
frmlbl.setText("");
x=0;
y=0;
z=0;
}

if(s.equals("log"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
frmlbl.setText("Log of "+jtx.getText()+" : ");
a=Math.log(Double.parseDouble(jtx.getText()));
jtx.setText("");
jtx.setText(jtx.getText() + a);
}
}

if(s.equals("1/x"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
frmlbl.setText("1/x of "+jtx.getText()+" : ");
a=1/Double.parseDouble(jtx.getText());
jtx.setText("");
jtx.setText(jtx.getText() + a);
}
}

if(s.equals("Exp"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
frmlbl.setText("Exp of "+jtx.getText()+": ");
a=Math.exp(Double.parseDouble(jtx.getText()));
jtx.setText("");
jtx.setText(jtx.getText() + a);
}
}

if(s.equals("x^2"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
frmlbl.setText("Square of "+jtx.getText()+" : ");
a=Math.pow(Double.parseDouble(jtx.getText()),2);
jtx.setText("");
jtx.setText(jtx.getText() + a);
}
}

if(s.equals("x^3"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
frmlbl.setText("Cube of "+jtx.getText()+" : ");
a=Math.pow(Double.parseDouble(jtx.getText()),3);
jtx.setText("");
jtx.setText(jtx.getText() + a);
}
}

if(s.equals("+/-"))
{
if(x==0)
{
jtx.setText("-"+jtx.getText());
x=1;
}
else
{
jtx.setText(jtx.getText());
}
}

if(s.equals("."))
{
if(y==0)
{
jtx.setText(jtx.getText()+".");
y=1;
}
else
{
jtx.setText(jtx.getText());
}
}

if(s.equals("+"))
{
if(jtx.getText().equals(""))
{

jtx.setText("");
temp=0;
ch='+';
}
else
{

temp=Double.parseDouble(jtx.getText());
com+=jtx.getText()+" and ";
frmlbl.setText(com);
frmlbl.setText("");
jtx.setText("");

ch='+';
y=0;
x=0;
}
jtx.requestFocus();
}

if(s.equals("-"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
temp=0;
ch='-';
}
else
{
x=0;
y=0;
temp=Double.parseDouble(jtx.getText());
com=jtx.getText();//+" from "+com;
frmlbl.setText("");
//frmlbl.setText(com);
frmlbl.setText("");
jtx.setText("");
ch='-';
}
jtx.requestFocus();
}

if(s.equals("/"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
temp=1;
ch='/';
}
else
{
x=0;
y=0;
temp=Double.parseDouble(jtx.getText());
com=com+jtx.getText()+" by ";
frmlbl.setText("");
frmlbl.setText(com);
frmlbl.setText("");
ch='/';
jtx.setText("");
}
jtx.requestFocus();
}

if(s.equals("*"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
temp=1;
ch='*';
}
else
{
x=0;
y=0;
temp=Double.parseDouble(jtx.getText());
com=com+jtx.getText()+" * ";
frmlbl.setText("");
frmlbl.setText(com);
frmlbl.setText("");
ch='*';
jtx.setText("");
}
jtx.requestFocus();
}

if(s.equals("MC")) [b]

(problem starts here)

[/b]
{
try
{
m1=0;
jtx.setText("");
}
catch(Exception ee)
{
System.out.println("Error:"+ee);
}
}

if(s.equals("MR"))
{
try
{
//jtx.setText("");
jtx.setText(jtx.getText() );
}
catch(Exception me)
{
System.out.println("Error:"+me);
}
}

if(s.equals("M+"))
{
if(k==1)
{
m1=Double.parseDouble(jtx.getText());
k++;
}
else
{
m1+=Double.parseDouble(jtx.getText());
jtx.setText(""+m1);
}
}

if(s.equals("M-"))
{
if(k==1)
{
m1=Double.parseDouble(jtx.getText());
k++;
}
else
{
m1-=Double.parseDouble(jtx.getText());
jtx.setText(""+m1);
}
} (ends with here)

if(s.equals("sqrt"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
frmlbl.setText("Square Root of "+jtx.getText()+" = ");
a=Math.sqrt(Double.parseDouble(jtx.getText()));
jtx.setText("");
jtx.setText(jtx.getText() + a);
}
}

if(s.equals("Sin"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
frmlbl.setText("Sin ( "+jtx.getText()+" ) = ");
a=Math.sin(Double.parseDouble(jtx.getText()));
jtx.setText("");
jtx.setText(jtx.getText() + a);
}
}

if(s.equals("Cos"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
frmlbl.setText("Cos ( "+jtx.getText()+" ) = ");
a=Math.cos(Double.parseDouble(jtx.getText()));
jtx.setText("");
jtx.setText(jtx.getText() + a);
}
}

if(s.equals("Tan"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
frmlbl.setText("Tan ( "+jtx.getText()+" ) = ");
a=Math.tan(Double.parseDouble(jtx.getText()));
jtx.setText("");
jtx.setText(jtx.getText() + a);
}
}

if(s.equals("="))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
temp1 = Double.parseDouble(jtx.getText());
switch(ch)
{
case '+':

result=temp+temp1;
frmlbl.setText("");
com=com+temp1+"=";
frmlbl.setText("Addition of "+com);
break;

case '-':
result=temp-temp1;
frmlbl.setText("");
com= temp1 + " from " + com + "=";
frmlbl.setText("Subtraction of "+ com);
break;

case '/':
result=temp/temp1;
frmlbl.setText("");
com=com+temp1+"=";
frmlbl.setText("Division of "+com);
break;

case '*':
result=temp*temp1;
frmlbl.setText("");
com=com + temp1 +"=";
frmlbl.setText("Multipliaction of "+com);
break;
}

jtx.setText("");
jtx.setText(jtx.getText() + result);
//to clear previous and display next value
com="";
z=1;
}
}
jtx.requestFocus();

}

public static void main(String args[])
{
calculator n=new calculator();

}

}


this s my swing calculator.. everything is going fine except MR,M+ functions.. anyone have idea about how to solve it..

[Rob Spoor]

Ambika, please use code tags. You can edit your post to add them properly.

[Maya Naga]

Ambika Nagalakshmi wrote:import java.awt.*;
import java.awt.event.*;
import java.awt.Dimension;
import javax.swing.ImageIcon;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.JLabel;

public class calculator extends JFrame implements ActionListener

{
// variables declaration
JLabel frmlbl;
double temp,temp1,result,a,b;
static double m1,m2;
int k=1,x=0,y=0,z=0;
char ch;
String com="";
JTextField jtx;
JTextArea txt;
JButton one,two,three,four,five,six,seven,eight,nine,zero,clr,pow2,pow3,exp;
JButton plus,min,div,lg,rec,mul,eq,plmi,poin,mr,mc,mp,mm,sqrt,sin,cos,tan;
JMenuBar bar;
JMenu view;
JMenuItem calendar,exit;
JRadioButtonMenuItem standard,scientific;
JSeparator jp;
ButtonGroup bg;
Container cont;
JPanel textPanel,syntpanel,buttonpanel,formpanel;

// constructor
calculator()
{
cont=getContentPane();
cont.setLayout(new BorderLayout());
JPanel textpanel=new JPanel();
//JPanel lblpanel=new JPanel();
Font font=new Font("Arial",Font.PLAIN,18);
ImageIcon icon = new ImageIcon("home/ambiga/java/Java Programs/Java Theoritical Notes-Good/course/course/week9/sun.gif ");

textpanel.setLayout(new GridLayout(0,2,3,2));
frmlbl=new JLabel(" ",icon, JLabel.RIGHT);
frmlbl.setFont(font);
frmlbl.setHorizontalAlignment(SwingConstants.CENTER);
frmlbl.setBackground(Color.white);
frmlbl.setForeground(Color.black);
frmlbl.setBorder(BorderFactory.createLineBorder(Color.black));
frmlbl.setOpaque(true);
//frmlbl.setIcon(new javax.swing.ImageIcon("home/ambiga/java/Java Programs/Java Theoritical Notes-Good/course/course/week9/sun.gif"));

jtx=new JTextField(17);
jtx.setFont(font);
jtx.setHorizontalAlignment(SwingConstants.CENTER);
jtx.setBackground(Color.black);
jtx.setMaximumSize(jtx.getPreferredSize() );
jtx.setForeground(Color.orange);
//jtx.setBorderPainted(false)
jtx.setBorder(BorderFactory.createLineBorder(Color.black));


//adding actions to the keys
jtx.addKeyListener(new KeyAdapter()
{
public void keyPressed(KeyEvent keyevent)
{
char c=keyevent.getKeyChar();
if(c>='0' && c<='9')
{
}
else
{
keyevent.consume();
}
}
});
//lblpanel.add(frmlbl);
textpanel.add(frmlbl);
textpanel.add(jtx);

buttonpanel=new JPanel();
buttonpanel.setLayout(new GridLayout(5,0,2,2));

syntpanel=new JPanel();
syntpanel.setLayout(new GridLayout(6,0,2,1));

bar=new JMenuBar();
view=new JMenu("View");
view.setMnemonic(KeyEvent.VK_V);

standard =new JRadioButtonMenuItem("Standard",true);
standard.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,ActionEvent.ALT_MASK));
standard.addItemListener(new radiohandler());

scientific =new JRadioButtonMenuItem("Scientific");
scientific.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,ActionEvent.ALT_MASK));
scientific.addItemListener(new radiohandler());

//using separator between design and exit
jp=new JSeparator();

exit=new JMenuItem("Exit");
exit.setMnemonic('E');
exit.addActionListener(this);

// creating button groups
bg=new ButtonGroup();
bg.add(standard);
bg.add(scientific);
view.add(standard);
view.add(scientific);
view.add(jp);
view.add(exit);
bar.add(view);
setJMenuBar(bar);

//standard

mr=new JButton("MR");
mr.setForeground(Color.orange);
mr.setBackground(Color.DARK_GRAY);
mr.setBorderPainted(false);
buttonpanel.add(mr);
mr.addActionListener(this);

seven=new JButton("7");
seven.setForeground(Color.orange);
seven.setBackground(Color.GRAY);
seven.setBorderPainted(false);
seven.setOpaque(true);
buttonpanel.add(seven);
seven.addActionListener(this);

eight=new JButton("8");
eight.setForeground(Color.orange);
eight.setBackground(Color.GRAY);
eight.setBorderPainted(false);
buttonpanel.add(eight);
eight.addActionListener(this);

nine=new JButton("9");
nine.setForeground(Color.orange);
nine.setBackground(Color.GRAY);
nine.setBorderPainted(false);
buttonpanel.add(nine);
nine.addActionListener(this);

clr=new JButton("AC");
clr.setForeground(Color.orange);
clr.setBackground(Color.GRAY);
clr.setBorderPainted(false);
buttonpanel.add(clr);
clr.addActionListener(this);

mc=new JButton("MC");
mc.setForeground(Color.orange);
mc.setBackground(Color.DARK_GRAY);
mc.setBorderPainted(false);
buttonpanel.add(mc);
mc.addActionListener(this);

four=new JButton("4");
four.setForeground(Color.orange);
four.setBackground(Color.GRAY);
four.setBorderPainted(false);
buttonpanel.add(four);
four.addActionListener(this);

five=new JButton("5");
five.setForeground(Color.orange);
five.setBackground(Color.GRAY);
five.setBorderPainted(false);
buttonpanel.add(five);
five.addActionListener(this);

six=new JButton("6");
six.setForeground(Color.orange);
six.setBackground(Color.GRAY);
six.setBorderPainted(false);
buttonpanel.add(six);
six.addActionListener(this);

mul=new JButton("*");
mul.setForeground(Color.orange);
mul.setBackground(Color.GRAY);
mul.setBorderPainted(false);
buttonpanel.add(mul);
mul.addActionListener(this);

mp=new JButton("M+");
mp.setForeground(Color.orange);
mp.setBackground(Color.DARK_GRAY);
mp.setBorderPainted(false);
buttonpanel.add(mp);
mp.addActionListener(this);

one=new JButton("1");
one.setForeground(Color.orange);
one.setBackground(Color.GRAY);
one.setBorderPainted(false);
buttonpanel.add(one);
one.addActionListener(this);

two=new JButton("2");
two.setForeground(Color.orange);
two.setBackground(Color.GRAY);
two.setBorderPainted(false);
buttonpanel.add(two);
two.addActionListener(this);

three=new JButton("3");
three.setForeground(Color.orange);
three.setBackground(Color.GRAY);
three.setBorderPainted(false);
buttonpanel.add(three);
three.addActionListener(this);

min=new JButton("-");
min.setForeground(Color.orange);
min.setBackground(Color.GRAY);
min.setBorderPainted(false);
buttonpanel.add(min);
min.addActionListener(this);

mm=new JButton("M-");
mm.setForeground(Color.orange);
mm.setBackground(Color.DARK_GRAY);
mm.setBorderPainted(false);
buttonpanel.add(mm);
mm.addActionListener(this);

zero=new JButton("0");
zero.setForeground(Color.orange);
zero.setBackground(Color.GRAY);
zero.setBorderPainted(false);
buttonpanel.add(zero);
zero.addActionListener(this);

plmi=new JButton("+/-");
plmi.setForeground(Color.orange);
plmi.setBackground(Color.GRAY);
plmi.setBorderPainted(false);
buttonpanel.add(plmi);
plmi.addActionListener(this);

poin=new JButton(".");
poin.setForeground(Color.orange);
poin.setBackground(Color.GRAY);
poin.setBorderPainted(false);
buttonpanel.add(poin);
poin.addActionListener(this);

plus=new JButton("+");
plus.setForeground(Color.orange);
plus.setBackground(Color.GRAY);
plus.setBorderPainted(false);
buttonpanel.add(plus);
plus.addActionListener(this);

rec=new JButton("1/x");
rec.setForeground(Color.orange);
rec.setBackground(Color.DARK_GRAY);
rec.setBorderPainted(false);
buttonpanel.add(rec);
rec.addActionListener(this);

sqrt=new JButton("sqrt");
sqrt.setForeground(Color.orange);
sqrt.setBackground(Color.DARK_GRAY);
sqrt.setBorderPainted(false);
buttonpanel.add(sqrt);
sqrt.addActionListener(this);

lg=new JButton("log");
lg.setForeground(Color.orange);
lg.setBackground(Color.DARK_GRAY);
buttonpanel.add(lg);
lg.setBorderPainted(false);
lg.addActionListener(this);

div=new JButton("/");
div.addActionListener(this);
div.setForeground(Color.orange);
div.setBackground(Color.GRAY);
div.setBorderPainted(false);
buttonpanel.add(div);

eq=new JButton("=");
eq.setForeground(Color.orange);
eq.setBackground(Color.GRAY);
eq.setBorderPainted(false);
buttonpanel.add(eq);
eq.addActionListener(this);

//scientific
sin=new JButton("Sin");
sin.setForeground(Color.white);
sin.setBackground(Color.gray);
sin.setBorderPainted(false);
syntpanel.add(sin);
sin.addActionListener(this);

cos=new JButton("Cos");
cos.setForeground(Color.white);
cos.setBackground(Color.gray);
cos.setBorderPainted(false);
syntpanel.add(cos);
cos.addActionListener(this);

tan=new JButton("Tan");
tan.setForeground(Color.white);
tan.setBackground(Color.gray);
tan.setBorderPainted(false);
syntpanel.add(tan);
tan.addActionListener(this);

pow2=new JButton("x^2");
pow2.setForeground(Color.white);
pow2.setBackground(Color.gray);
pow2.setBorderPainted(false);
syntpanel.add(pow2);
pow2.addActionListener(this);

pow3=new JButton("x^3");
pow3.setForeground(Color.white);
pow3.setBackground(Color.gray);
syntpanel.add(pow3);
pow3.setBorderPainted(false);
pow3.addActionListener(this);

exp=new JButton("Exp");
exp.setForeground(Color.white);
exp.setBackground(Color.gray);
exp.setBorderPainted(false);
syntpanel.add(exp);
exp.addActionListener(this);

cont.add("Center",buttonpanel);
cont.add("North",textpanel);

this.setTitle("Swing Calculator");
this.setSize(450,250);
this.setLocation(300,300);
this.setResizable(true);
this.setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Clear();
}
class radiohandler implements ItemListener
{
public void itemStateChanged(ItemEvent ie)
{
AbstractButton button=(AbstractButton)ie.getItem();
String label=button.getText();

if(label.equals("Standard"))
{
cont.remove(syntpanel);
validate();
}
if(label.equals("Scientific"))
{
cont.add("West",syntpanel);
validate();
}

}
}
public void actionPerformed(ActionEvent e)
{
String s=e.getActionCommand();
if(s.equals("Exit"))
{
System.exit(0);
}
if(s.equals("1"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"1");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"1");
z=0;
}
}
if(s.equals("2"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"2");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"2");
z=0;
}
}
if(s.equals("3"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"3");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"3");
z=0;
}
}

if(s.equals("4"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"4");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"4");
z=0;
}
}

if(s.equals("5"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"5");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"5");
z=0;
}
}

if(s.equals("6"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"6");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"6");
z=0;
}
}

if(s.equals("7"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"7");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"7");
z=0;
}
}

if(s.equals("8"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"8");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"8");
z=0;
}
}

if(s.equals("9"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"9");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"9");
z=0;
}
}

if(s.equals("0"))
{
if(z==0)
{
jtx.setText(jtx.getText()+"0");
}
else
{
jtx.setText("");
jtx.setText(jtx.getText()+"0");
z=0;
}
}

if(s.equals("AC"))
{
jtx.setText("");
frmlbl.setText("");
x=0;
y=0;
z=0;
}

if(s.equals("log"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
frmlbl.setText("Log of "+jtx.getText()+" : ");
a=Math.log(Double.parseDouble(jtx.getText()));
jtx.setText("");
jtx.setText(jtx.getText() + a);
}
}

if(s.equals("1/x"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
frmlbl.setText("1/x of "+jtx.getText()+" : ");
a=1/Double.parseDouble(jtx.getText());
jtx.setText("");
jtx.setText(jtx.getText() + a);
}
}

if(s.equals("Exp"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
frmlbl.setText("Exp of "+jtx.getText()+": ");
a=Math.exp(Double.parseDouble(jtx.getText()));
jtx.setText("");
jtx.setText(jtx.getText() + a);
}
}

if(s.equals("x^2"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
frmlbl.setText("Square of "+jtx.getText()+" : ");
a=Math.pow(Double.parseDouble(jtx.getText()),2);
jtx.setText("");
jtx.setText(jtx.getText() + a);
}
}

if(s.equals("x^3"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
frmlbl.setText("Cube of "+jtx.getText()+" : ");
a=Math.pow(Double.parseDouble(jtx.getText()),3);
jtx.setText("");
jtx.setText(jtx.getText() + a);
}
}

if(s.equals("+/-"))
{
if(x==0)
{
jtx.setText("-"+jtx.getText());
x=1;
}
else
{
jtx.setText(jtx.getText());
}
}

if(s.equals("."))
{
if(y==0)
{
jtx.setText(jtx.getText()+".");
y=1;
}
else
{
jtx.setText(jtx.getText());
}
}

if(s.equals("+"))
{
if(jtx.getText().equals(""))
{

jtx.setText("");
temp=0;
ch='+';
}
else
{

temp=Double.parseDouble(jtx.getText());
com+=jtx.getText()+" and ";
frmlbl.setText(com);
frmlbl.setText("");
jtx.setText("");

ch='+';
y=0;
x=0;
}
jtx.requestFocus();
}

if(s.equals("-"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
temp=0;
ch='-';
}
else
{
x=0;
y=0;
temp=Double.parseDouble(jtx.getText());
com=jtx.getText();//+" from "+com;
frmlbl.setText("");
//frmlbl.setText(com);
frmlbl.setText("");
jtx.setText("");
ch='-';
}
jtx.requestFocus();
}

if(s.equals("/"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
temp=1;
ch='/';
}
else
{
x=0;
y=0;
temp=Double.parseDouble(jtx.getText());
com=com+jtx.getText()+" by ";
frmlbl.setText("");
frmlbl.setText(com);
frmlbl.setText("");
ch='/';
jtx.setText("");
}
jtx.requestFocus();
}

if(s.equals("*"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
temp=1;
ch='*';
}
else
{
x=0;
y=0;
temp=Double.parseDouble(jtx.getText());
com=com+jtx.getText()+" * ";
frmlbl.setText("");
frmlbl.setText(com);
frmlbl.setText("");
ch='*';
jtx.setText("");
}
jtx.requestFocus();
}

 [color=red] [size=12] my problem starts here  

  if(s.equals("MC"))
          {
		try
		{             
			 m1=0;
        	         jtx.setText("");
		}
		catch(Exception ee)
		{
			System.out.println("Error:"+ee);
		}
          }

        if(s.equals("MR"))
        {
		try
		{             
			//jtx.setText("");
        	        jtx.setText(jtx.getText() );
		}
		catch(Exception me)
		{
			System.out.println("Error:"+me);
		}
        }

        if(s.equals("M+"))
        {
                if(k==1)
                {
                m1=Double.parseDouble(jtx.getText());
                k++;
                }
                else
                {
                m1+=Double.parseDouble(jtx.getText());
                jtx.setText(""+m1);
                }
        }

        if(s.equals("M-"))
        {
                if(k==1)
                {
                m1=Double.parseDouble(jtx.getText());
                k++;
                }
                else
                {
                m1-=Double.parseDouble(jtx.getText());
                jtx.setText(""+m1);
                }
         }                        
[/color] [/size]   

if(s.equals("sqrt"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
frmlbl.setText("Square Root of "+jtx.getText()+" = ");
a=Math.sqrt(Double.parseDouble(jtx.getText()));
jtx.setText("");
jtx.setText(jtx.getText() + a);
}
}

if(s.equals("Sin"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
frmlbl.setText("Sin ( "+jtx.getText()+" ) = ");
a=Math.sin(Double.parseDouble(jtx.getText()));
jtx.setText("");
jtx.setText(jtx.getText() + a);
}
}

if(s.equals("Cos"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
frmlbl.setText("Cos ( "+jtx.getText()+" ) = ");
a=Math.cos(Double.parseDouble(jtx.getText()));
jtx.setText("");
jtx.setText(jtx.getText() + a);
}
}

if(s.equals("Tan"))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
frmlbl.setText("Tan ( "+jtx.getText()+" ) = ");
a=Math.tan(Double.parseDouble(jtx.getText()));
jtx.setText("");
jtx.setText(jtx.getText() + a);
}
}

if(s.equals("="))
{
if(jtx.getText().equals(""))
{
jtx.setText("");
}
else
{
temp1 = Double.parseDouble(jtx.getText());
switch(ch)
{
case '+':

result=temp+temp1;
frmlbl.setText("");
com=com+temp1+"=";
frmlbl.setText("Addition of "+com);
break;

case '-':
result=temp-temp1;
frmlbl.setText("");
com= temp1 + " from " + com + "=";
frmlbl.setText("Subtraction of "+ com);
break;

case '/':
result=temp/temp1;
frmlbl.setText("");
com=com+temp1+"=";
frmlbl.setText("Division of "+com);
break;

case '*':
result=temp*temp1;
frmlbl.setText("");
com=com + temp1 +"=";
frmlbl.setText("Multipliaction of "+com);
break;
}

jtx.setText("");
jtx.setText(jtx.getText() + result);
//to clear previous and display next value
com="";
z=1;
}
}
jtx.requestFocus();

}

public static void main(String args[])
{
calculator n=new calculator();

}

}

thanks maneesh.. i have coded my problem..

[Maya Naga]

help me

[Maneesh Godbole]

Did you preview your post before you submitted your last post? Half is using Code tags whereas half is using the Quote tags. If you want people to help you, you can take some efforts to help them help you.
I do not think anybody is interested in going through so many lines of code. What you need to do is post a SSCCE code
Please do take out time to go through the link I have provided to understand what SSCCE code means.

[Campbell Ritchie]

Using things like if (f.equals("cos")) . . . looks dreadful to me. You are using a non-object-oriented style and that code would be really difficult to maintain.

[Maya Naga]

hi everyone thanks for the help...

i have entirely changed the code that uses both mouse and key listener..
its working perfect..
the problem now is that i want to include next and previous button to display last 5 calculations.
here in this program i have used labels to show calculations.
so i need to store these label values and i want to display it in textfield..

can any help which collection method in java i have to use..

am new to collection...

   
class nextListener extends MouseAdapter 	
	{
		
		public void mouseClicked(MouseEvent e)
		{
				try
				{
					itr = pn.listIterator();
   					 while (itr.hasNext())
					{
					      System.out.println(itr.next());
					}										
				}
				catch(EmptyStackException ie)
				{
					System.out.println("Error:"+ie);
					
				}
				
		}		
	}
			
	class previousListener extends MouseAdapter 	
	{
		
		public void mouseClicked(MouseEvent e)
		{
	/*			try
				{
					itr = arraylist.listIterator();
   					 while (itr.hasPrevious())
					{
					      System.out.println(itr.previous());
					}						
				}
				catch(EmptyStackException ie)
				{
					System.out.println("Error:"+ie);
					
				}*/
				
		}		
	}
 

this is the next and previous buttons mouse listener..
i need to display when we click these buttons

i have attached entire program...

thanks

[Maya Naga]

   
import java.awt.*;
import java.awt.event.*;
import javax.swing.KeyStroke;
import javax.swing.*;
import java.util.*;

import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.ButtonGroup;
import javax.swing.JMenuBar;

import java.util.ArrayList;
import java.util.ListIterator;



public class calculator implements ActionListener, ItemListener, KeyListener		
{

	

	// Defining and initializing the frame,labels,panels, textfield.......
	// JFrame 	: frame.
	// JPanel's	: calculation, buttons, all, backspace
	// JButtons	: 0 to 9, + to /, =, sqrt, sin, cos, tan, 1/x, exp, log
	// JTextField	: tdispaly
	// JLabel	: firstvalue, operator, secondvalue, equal, result
	// JCheckbox	: standard, scientific and showing labels
	// JMenu	: file, view, help
	// JMenuItem	: Reset, exit, about.

	
	JFrame frame = new JFrame("Sample Calculator" );
	JPanel all_pnl, backsp_pnl,  button_pnl, calc_pnl;
	JLabel lblnum1, lblope, lblnum2, lbleql, lblres;
	JTextField txtresult;
	JButton buttons[] = new JButton[30];
	JMenuBar Menu = new JMenuBar();
	JMenu file, view, help;
	JMenuItem reset, exit, about;
	JCheckBoxMenuItem showcal;

	ListIterator itr;
	String txtnum;
	String sign;
	String label;
	String R;
	String txtstring;
	String s,s1,s2,s3,s4,t,string;
	
	Vector pn=new Vector();
	//Vector v=new Vector();
					
	String str;
	ArrayList<String> arraylist=new ArrayList<String>();


	double num1, num2, result;

	boolean decimalvalue, secondnumber, secondvaluetrue, lblsecondnum, secondequal, error;

	static int input = 30;

	static float divide_by_zero = (float)-.00000672;

	static float Error = (float)-.00000456;

	
	// Calculator constructor

	calculator() 

	{

		//setting frame size and visibility

		frame.setSize(308, 254);

		frame.setLocation(470, 290);

		frame.setLayout(new BorderLayout());

		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		frame.setResizable(false);

		frame.setBackground(Color.black);
		// defining menu and menu items

		file = new JMenu("File");
		file.setMnemonic(KeyEvent.VK_F);

		view = new JMenu("View");

		view.setMnemonic(KeyEvent.VK_V);
		help = new JMenu("Help");

		help.setMnemonic(KeyEvent.VK_H);
		reset = new JMenuItem("Reset");
		reset.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_R, ActionEvent.ALT_MASK));

		exit = new JMenuItem("Exit");
	       exit.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_E, ActionEvent.ALT_MASK));

		showcal = new JCheckBoxMenuItem("Show Calculations");

		about = new JMenuItem("Calculator");

		about.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A, ActionEvent.ALT_MASK));
	
		//adding menu items to main menu
		Menu.add(file);         

		Menu.add(view);

		Menu.add(help);

		file.add(reset);

		file.add(exit);

		view.add(showcal);

		help.add(about);

		reset.addActionListener(this);

		exit.addActionListener(this);

		showcal.addItemListener(this);

		about.addActionListener(this);


		// assigning buttons to panels
		// calc_pnl 	: holds all labels for calculation done
		// button_pnl	: holds all buttons (not ce, c, backspace)
		// all_pnl	: holds all other panels
		// backsp_pnl	: holds ce, c, backspace buttons

		all_pnl 	= new JPanel();

		backsp_pnl 	= new JPanel();

		button_pnl 	= new JPanel();

		calc_pnl 	= new JPanel();

		

		//Setting Layouts 

		all_pnl.setLayout(new BorderLayout());


		button_pnl.setLayout(new GridLayout(5, 0, 2, 2));
		button_pnl.setBackground(Color.black);


		backsp_pnl.setLayout(new GridLayout(2,0, 2, 2));
		backsp_pnl.setBackground(Color.black);

		calc_pnl.setLayout(new FlowLayout(FlowLayout.CENTER));
		calc_pnl.setBackground(Color.black);
		all_pnl.setBackground(Color.black);

		

		//Making Labels 

		lblnum1 	= new JLabel();
		lblnum1.setForeground(Color.orange);

		lblope 		= new JLabel();

		lblope.setForeground(Color.orange);

		lblnum2 	= new JLabel();

		lblnum2.setForeground(Color.orange);

		lbleql 		= new JLabel();

		lbleql.setForeground(Color.orange);

		lblres 		= new JLabel();

		lblres.setForeground(Color.orange);

		
		calc_pnl.add(lblnum1);

		calc_pnl.add(lblope);

		calc_pnl.add(lblnum2);

		calc_pnl.add(lbleql);

		calc_pnl.add(lblres);

		

		//Text Field 

		txtresult = new JTextField("0");

		txtresult.setEditable(false);	

		txtresult.setHorizontalAlignment(JTextField.RIGHT);

		txtresult.setBackground(Color.black);

		txtresult.setForeground(Color.orange);

		txtresult.setOpaque(true);

		txtresult.addKeyListener(this);
		

		//Making Buttons and adding to Panel 

		buttons[0] = new JButton("0");

		buttons[10] = new JButton(".");

		buttons[11] = new JButton("=");

		buttons[12] = new JButton("/");

		buttons[13] = new JButton("*");

		buttons[14] = new JButton("-");

		buttons[15] = new JButton("+");

		buttons[16] = new JButton("sqrt");

		buttons[17] = new JButton("%");

		buttons[18] = new JButton("1/x");

		buttons[19] = new JButton("+/-");

		for(int i=7; i<10; i++)	

		{

			buttons[i] = new JButton(String.valueOf(i));

			button_pnl.add(buttons[i]);

		}

		button_pnl.add(buttons[12]);

		button_pnl.add(buttons[16]);

		for(int i=4; i<7; i++)	

		{

			buttons[i] = new JButton(String.valueOf(i));

			button_pnl.add(buttons[i]);

		}

		button_pnl.add(buttons[13]);

		button_pnl.add(buttons[17]);

		

		for(int i=1; i<4; i++)	

		{

			buttons[i] = new JButton(String.valueOf(i));

			button_pnl.add(buttons[i]);

		}

		button_pnl.add(buttons[14]);

		button_pnl.add(buttons[18]);

		button_pnl.add(buttons[0]);

		button_pnl.add(buttons[10]);

		button_pnl.add(buttons[11]);

		button_pnl.add(buttons[15]);

		button_pnl.add(buttons[19]);

		

		buttons[23]=new JButton("sin");

		buttons[24]=new JButton("cos");

		buttons[25]=new JButton("tan");

		buttons[26]=new JButton("x^2");

		buttons[27]=new JButton("x^3");

		buttons[28]=new JButton("<<");
		buttons[29]=new JButton(">>");


		buttons[28].setToolTipText("Click this button to get previous calculation.");
		buttons[29].setToolTipText("Click this button to get next calculation.");		



		//mouse listener for previous and next button
		MouseListener previouslistener = new previousListener();
		buttons[28].addMouseListener(previouslistener);
	
		MouseListener nextlistener = new nextListener();
		buttons[29].addMouseListener(nextlistener);
	
		for(int i=23;i<30;i++)

		{

		button_pnl.add(buttons[i]);

		}

		


		//Creating Backspace, CE, C Button 

		buttons[20] = new JButton("BackSpace");

		buttons[21] = new JButton("CE");

		buttons[22] = new JButton(" C ");

		
		backsp_pnl.add(buttons[20]);

		backsp_pnl.add(buttons[21]);

		backsp_pnl.add(buttons[22]);

		backsp_pnl.add(buttons[28]);
		backsp_pnl.add(buttons[29]);

		

		//add actionlistener and color to every buttons	

		

		for(int i=0; i<buttons.length; i++)	

		{

			buttons[i].addActionListener(this);

			if(i<16) 

			{

				buttons[i].setBackground(Color.black);

				buttons[i].setForeground(Color.red);

			}

			else
			{
				buttons[i].setBackground(Color.DARK_GRAY);

				buttons[i].setForeground(Color.orange);

	
			}

		}

		

		//add panels to frame



		all_pnl.add(txtresult, BorderLayout.NORTH);

		all_pnl.add(backsp_pnl,BorderLayout.WEST);

		all_pnl.add(button_pnl, BorderLayout.SOUTH);

		frame.add(Menu, BorderLayout.NORTH);

		frame.add(calc_pnl);

		frame.add(all_pnl, BorderLayout.SOUTH);

		frame.setVisible(true);

		calc_pnl.setVisible(false);

		

		Clear();

	}

	

	public void actionPerformed(ActionEvent e)	
	{

		//	numbers

		for(int i=0; i<10; i++)
		{

			if(e.getSource() == buttons[i])

				addDigit(String.valueOf(i));

		}

		//	 Decimal Point 

		if(e.getSource() == buttons[10])	
		{

			if(!decimalvalue)	
			{

				addDigit(".");

				decimalvalue = true;

			}

		}

		for(int i=11; i<buttons.length; i++)	
		{

			if(e.getSource() == buttons[i])	
			{

				switch(i)	
				{

					case 11:

						Calculate("=");

						break;

					case 12:

						Calculate("/");

						break;

					case 13:

						Calculate("*");

						break;

					case 14:

						Calculate("-");

						break;

					case 15:

						Calculate("+");

						break;

					case 16:

						sqrt();

						break;

					case 17:

						percent();

						break;

					case 18:

						divideByX();

						break;

					case 19:

						signChange();

						break;

					case 20:

						Backspace();

						break;

					case 21:

						ClearExisting();

						break;

					case 22:

						Clear();

						break;

					case 23: 

						sinfn();

						break;

					case 24: 

						cosfn();

						break;

					case 25: 

						tanfn();

						break;

					case 26: 

						sqr_x();

						break;

					case 27: 

						xcube();

						break;
					

				}

			}

		}

		if(!(buttons[11] == e.getSource()))

			secondnumber = false;

		
		//Reset option

		if(e.getSource() == reset)	
		{

			Clear();

			frame.setSize(308, 254);

			calc_pnl.setVisible(false);

			showcal.setState(false);

			JOptionPane.showMessageDialog(null, "Reseted Successfully!!" 

			, "Reset", JOptionPane.INFORMATION_MESSAGE);

		}

		
		// Exit option

		if(e.getSource() == exit)	
		{

			System.exit(0);

		}


		// About option

		if(e.getSource() == about)	
		{

			showAboutDialog();

		}

		txtresult.requestFocus();

	}



	// make visible of scientific and calculation labels
	public void itemStateChanged(ItemEvent e)	{

		if(e.getSource() == showcal)	{

			if(e.getStateChange() == ItemEvent.SELECTED)	{

				frame.setSize(308, 290);

				calc_pnl.setVisible(true);

			}	else {

				frame.setSize(308, 250);

				calc_pnl.setVisible(false);

			}

		}

	}

	

	public void keyPressed(KeyEvent e)
	{

		int key = e.getKeyChar();

		if(!(key == KeyEvent.VK_ENTER))

			secondequal = false;

		switch(key)	{

			case KeyEvent.VK_0:

				addDigit("0");

				break;

			case KeyEvent.VK_1:

				addDigit("1");

				break;

			case KeyEvent.VK_2:

				addDigit("2");

				break;

			case KeyEvent.VK_3:

				addDigit("3");

				break;

			case KeyEvent.VK_4:

				addDigit("4");

				break;

			case KeyEvent.VK_5:

				addDigit("5");

				break;

			case KeyEvent.VK_6:

				addDigit("6");

				break;

			case KeyEvent.VK_7:

				addDigit("7");

				break;

			case KeyEvent.VK_8:

				addDigit("8");

				break;

			case KeyEvent.VK_9:

				addDigit("9");

				break;

			case KeyEvent.VK_PERIOD:

				if(!decimalvalue)	{

					addDigit(".");

					decimalvalue = true;

				}

				break;

			case KeyEvent.VK_ENTER:

				Calculate("=");

				break;

			case KeyEvent.VK_SLASH:

				Calculate("/");

				break;

			case 42:

				Calculate("*");

				break;

			case KeyEvent.VK_MINUS:

				Calculate("-");

				break;

			case 43:

				Calculate("+");

				break;

			case KeyEvent.VK_BACK_SPACE:

				Backspace();

				break;

			case KeyEvent.VK_ESCAPE:

				Clear();

				break;

			case KeyEvent.VK_DELETE:

				ClearExisting();

				break;

		}

	}

	public void keyTyped(KeyEvent e)	{}

	public void keyReleased(KeyEvent e)	{}

	

	//adding number buttons to frame and setting zero to display box if we enter zero	

	public void addDigit(String digit)	
	{

		if(!error)	
		{

			if(txtnum.equals("") && digit.equals("0"))	
			{

				txtresult.setText("0");

					txtnum = "";

				if(lblsecondnum)

					lblnum2.setText("0");

				else	
				{

					lblnum1.setText("0");

					lblnum2.setText("_");

					lblres.setText("_");

				}

			}	
			else if(txtnum.length() < input)	
			{

				txtnum += digit;

				if(txtnum.charAt(0) == '.')

					txtnum = "0" + txtnum;

				txtresult.setText(txtnum);

				if(secondvaluetrue)

					secondnumber = true;

				checkLabels();

			}

			secondequal = false;

		}

	}

	

	// Calculation
	public void Calculate(String operator)	
	{	
		
		if(!error)	
		{

			decimalvalue = false;

			if(operator.equals("="))	
			{

				if(secondequal)	
				{	

					num1 = result;
					//Equal(= (ie) enter key) Pressed Twice or more						
					result = Process();			

					Display(result);				

				}	
				else
				{				

					num2 = Double.parseDouble(txtresult.getText());	

					setSecondLabel();
					//Equal(=) Sign Pressed Once
					result = Process();

					Display(result);								

					num1 = result;		

					secondequal = true;								

				}								

				secondnumber = false;
				secondvaluetrue = false;

				lblsecondnum = false;

				//putting the values into stack


				s	= lblnum1.getText();
				s1	= lblope.getText();
				s2	= lblnum2.getText();
				s3	= lbleql.getText();
				s4	= lblres.getText();
				string	= s+s1+s2+s3+s4;
				str=string;
				try
				{
				pn.add(str);
				}
				catch(Exception e)
				{
				}
				System.out.println(string);
		


			}	
			else 
			{

				if(secondnumber)	
				{	

					num2 = Double.parseDouble(txtresult.getText());

					setSecondLabel();	

					result = Process();

					Display(result);

					//2nd part
					num1 = result;	

					lblnum2.setText("_");	

					lblres.setText("_");	

					lblope.setText("opr");	

					setFirstLabel(String.valueOf(result));

					secondnumber = false;		

				}	
				else 
				{			

					num1 = Double.parseDouble(txtresult.getText());	

					secondvaluetrue = true;										

					setFirstLabel();

					lblnum2.setText("_");
					//First Part

					lblres.setText("_");	

					lblope.setText("opr");

					lblsecondnum = true;
			



				}						

				sign = operator;	

				secondequal = false;
				//s=lblnum1.getText()+""+lblope.getText()+""+lblnum2.getText()+""+lbleql.getText()+""+lblres.getText();	

			}

			lblope.setText(sign);

			txtnum = "";
			
		}

	}

	

	//process method : result in textfield

	public double Process()	
	{

		if(sign.equals("*"))

			return (num1 * num2);

		else if(sign.equals("-"))

			return (num1 - num2);

		else if(sign.equals("+"))

			return (num1 + num2);

		else if(sign.equals("/"))	
		{

			if(num2 == 0)

				return divide_by_zero; 
			else

				return (num1 / num2);

		}

		else

			return Error;	

	}

	

	//Displays() method

	public void Display(double num)
	{


		if(num == divide_by_zero)	
		{

			R = "Cannot Divide by Zero!";

			error = true;

		}

		else if(num == Error)	
		{

			R = "Invalid Input for Function!";

			error = true;

		}

		else	
		{

			R = String.valueOf(num);

			if((R.charAt((R.length()) -1) == '0') && (R.charAt((R.length()) -2) == '.'))

			R = R.substring(0, R.length() - 2);

		}

		txtresult.setText(R);

		lblres.setText(R);

		setFirstLabel();

	}

	

	// sqrt()

	public void sqrt()	
	{

		if(!error)	
		{

			txtstring = txtresult.getText();

			try 
			{
				result = Math.sqrt(Double.parseDouble(txtstring));
			}
			catch(Exception e) 
			{
				result = Error;
			}

			if(txtstring.indexOf("-") == 0)

				result = Error;

			lblnum2.setText("sqrt ( " + txtstring + " )");

			Display(result);
			//result=Process();

			lblnum1.setText("");

			lblope.setText("");

			secondnumber = false;

			secondvaluetrue = false;

			lblsecondnum = false;

			txtnum = "";

		}

	}

	

	// sin function (sinfn)

	public void sinfn()

	{

		if(!error)

		{

			txtstring=txtresult.getText();

			try

			{

				result=Math.sin(Double.parseDouble(txtstring));

			}

			catch(Exception e)

			{

				result=Error;

			}

			if(txtstring.indexOf("_")==0)

				result=Error;

			lblnum2.setText("Sin (" + txtstring + " )");

			Display(result);

			lblnum1.setText("");

			lblope.setText("");

			secondnumber=false;

			secondvaluetrue=false;

			lblsecondnum=false;

			txtnum="";

		}

	}

	

	// cos function (cosfn)

	public void cosfn()

	{

		if(!error)

		{

			txtstring=txtresult.getText();

			try

			{

				result=Math.cos(Double.parseDouble(txtstring));

			}

			catch(Exception e)

			{

				result=Error;

			}

			if(txtstring.indexOf("_")==0)

				result=Error;

			lblnum2.setText("Cos (" + txtstring + " )");

			Display(result);

			lblnum1.setText("");

			lblope.setText("");

			secondnumber=false;

			secondvaluetrue=false;

			lblsecondnum=false;

			txtnum="";

		}

	}


	// tan function (tanfn)

	public void tanfn()

	{

		if(!error)

		{

			txtstring=txtresult.getText();

			try

			{

				result=Math.tan(Double.parseDouble(txtstring));

			}

			catch(Exception e)

			{

				result=Error;

			}

			if(txtstring.indexOf("_")==0)

				result=Error;

			lblnum2.setText("Tan (" + txtstring + " )");

			Display(result);

			lblnum1.setText("");

			lblope.setText("");

			secondnumber=false;

			secondvaluetrue=false;

			lblsecondnum=false;

			txtnum="";

		}

	}

	
	

	

	//square function sqr_x()

	public void sqr_x()

	{

		if(!error)

		{

			txtstring=txtresult.getText();

			try

			{

				result=Math.pow(Double.parseDouble(txtstring),2);

			}

			catch(Exception e)

			{

				result=Error;

			}

			if(txtstring.indexOf("_")==0)

				result=Error;

			lblnum2.setText("Square (" + txtstring + " )");

			Display(result);

			lblnum1.setText("");

			lblope.setText("");

			secondnumber=false;

			secondvaluetrue=false;

			lblsecondnum=false;

			txtnum="";

		}

	}

	

	//cube function xcube()

	public void xcube()

	{

		if(!error)

		{

			txtstring=txtresult.getText();

			try

			{

				result=Math.pow(Double.parseDouble(txtstring),3);

			}

			catch(Exception e)

			{

				result=Error;

			}

			if(txtstring.indexOf("_")==0)

				result=Error;

			lblnum2.setText("Cube (" + txtstring + " )");

			Display(result);

			lblnum1.setText("");

			lblope.setText("");

			secondnumber=false;

			secondvaluetrue=false;

			lblsecondnum=false;

			txtnum="";

		}

	}

	

	

	

	// (%)fn

	public void percent()	
	{

		if(!error)	
		{

			txtstring = txtresult.getText();

			try 
			{
				result = (Double.parseDouble(txtstring) / 100);
			}
			catch(Exception e) 
			{
				result = Error;
			}

			Display(result);

			setFirstLabel(txtstring);

			lblope.setText("/");

			setSecondLabel("100");

			secondnumber = false;

			secondvaluetrue = false;

			lblsecondnum = false;

			txtnum = "";

		}

	}

	

	//1 Divide by X function (1/x)

	public void divideByX()	
	{

		if(!error)	
		{

			txtstring = txtresult.getText();

			if(txtstring.equals("0"))

				result = divide_by_zero;

			else

				try 
				{
					result = 1 / Double.parseDouble(txtstring);
				}
				catch(Exception e) 
				{
					result = Error;
				}

			setSecondLabel(txtstring);

			Display(result);

			setFirstLabel("1");

			lblope.setText("/");

			secondnumber = false;

			secondvaluetrue = false;

			lblsecondnum = false;

			txtnum = "";

		}

	}

	

	// +/- method

	public void signChange()		
	{

		if(!error)	
		{

			txtstring = txtresult.getText();

			if(txtstring.equals("0"))	

			{

				/* Do Nothing*/

			}
			else
			{

				if(txtstring.charAt(0) == '-')

					txtnum = txtnum.substring(1, txtnum.length());

				else

					txtnum = "-" + txtstring;

				
				txtresult.setText(txtnum);

				checkLabels();

			}

		}

	}

	

	// used to check whether the entered value by user is valid or not
	
	public void checkLabels()	
	{

		if(txtnum.equals(""))	
		{

			if(lblsecondnum)	
			{

				setFirstLabel();

				lblnum2.setText("_");	
			}

			else	
			{

				lblnum1.setText("_");

				lblnum2.setText("_");

				lblres.setText("_");

				lblope.setText("?");

			}

		} 
		else	
		{

			if(lblsecondnum)

				lblnum2.setText(txtnum);

			else	
			{

				lblnum1.setText(txtnum);

				lblnum2.setText("_");

				lblres.setText("_");

				lblope.setText("!!");

			}

		}

	}

	

/* lblnum1, gets and set the number1 without the .0 at the end.

Sets lblnum1 to whatever number1 is depending on where it is needed.*/

	
	public void setFirstLabel()	
	{

		label = String.valueOf(num1);

		if(label.length() > 2)	
		{

			if(label.charAt(label.length() - 1) == '0' && label.charAt(label.length() - 2) == '.')

				label = label.substring(0, label.length() - 2);

		}

		lblnum1.setText(label);

	}


	public void setFirstLabel(String f)	
	{

		if(f.length() > 2)	
		{

			if(f.charAt(f.length() - 1) == '0' && f.charAt(f.length() - 2) == '.')

				f = f.substring(0, f.length() - 2);

		}

		lblnum1.setText(f);

	}


//for second label (lblnum2)

	public void setSecondLabel()	
	{

		label = String.valueOf(num2);

		lblres.setText("_");

		if(label.length() > 2)	
		{

			if(label.charAt(label.length() - 1) == '0' && label.charAt(label.length() - 2) == '.')

				label = label.substring(0, label.length() - 2);

		}

		lblnum2.setText(label);

	}

	
	public void setSecondLabel(String s)
	{

		if(s.length() > 2)	
		{

			if(s.charAt(s.length() - 1) == '0' && s.charAt(s.length() - 2) == '.')

				s = s.substring(0, s.length() - 2);

		}

		lblnum2.setText(s);

	}

	

	//Backspace

	public void Backspace()
	{

		if(!error)	
		{

			if(txtresult.getText().length() < 2)	
			{

				txtnum = "";

				txtresult.setText("0");

			} 
			else
			{

				if((txtresult.getText().charAt(txtresult.getText().length() - 1) == '.' && 

				txtresult.getText().charAt(txtresult.getText().length() - 2) == '0') ||

				(txtresult.getText().length() == 2 && txtresult.getText().charAt(0) == '-'))	
				{

					txtnum = "";

					txtresult.setText("0");

					decimalvalue = false;

				}	
				else	
				{

					if(txtresult.getText().charAt(txtresult.getText().length() - 1) == '.')

					decimalvalue = false;

						txtnum = txtresult.getText().substring(0, txtresult.getText().length() - 1);

						txtresult.setText(txtnum);

				}

			}

			checkLabels();

		}

	}

	

	//Clears everything

	public void ClearExisting()
	{

		txtnum = "";

		txtresult.setText("0");

		decimalvalue = false;

		checkLabels();

		error = false;

	}

	

	//Resets everything 

	public void Clear()	
	{

		txtnum 		= "";
		sign 		= "0"; 
		txtstring 	= ""; 

		label 		= ""; 
		R		= "";

		num1 		= 0.0; 
		num2 		= 0.0; 
		result 		= 0.0;

		decimalvalue 	= false; 	
		secondnumber 	= false; 
		secondvaluetrue = false;

		lblsecondnum	= false; 
		secondequal 	= false; 
		error 		= false;

		txtresult.setText("0");

		lblnum1.setText("_");

		lblope.setText("!!");

		lblnum2.setText("_");

		lbleql.setText("=");

		lblres.setText("_");

	}

	
	


	// about dialog box
	public void showAboutDialog()	
	{

		JOptionPane.showMessageDialog(null, "This is a Swing Calculator", "Welcome", JOptionPane.INFORMATION_MESSAGE);
	}

 

here i want to add any collection method to display previous and next calculations  
	class nextListener extends MouseAdapter 	
	{
		
		public void mouseClicked(MouseEvent e)
		{
				try
				{
					itr = pn.listIterator();
   					 while (itr.hasNext())
					{
					      System.out.println(itr.next());
					}										
				}
				catch(EmptyStackException ie)
				{
					System.out.println("Error:"+ie);
					
				}
				
		}		
	}
			
	class previousListener extends MouseAdapter 	
	{
		
		public void mouseClicked(MouseEvent e)
		{
	/*			try
				{
					itr = arraylist.listIterator();
   					 while (itr.hasPrevious())
					{
					      System.out.println(itr.previous());
					}						
				}
				catch(EmptyStackException ie)
				{
					System.out.println("Error:"+ie);
					
				}*/
				
		}		
	}

 

public static void main(String[] args)
{

new calculator();

}

}

hi everyone thanks for the help...

i have entirely changed the code that uses both mouse and key listener..
it is working perfect..
the problem now is that i want to include next and previous button to display last 5 calculations.
here in this program i have used labels to show calculations.
so i need to store these label values and i want to display it in text field..

can any one help which java collection method in i have to use..

am new to collection...




here is the next and previous buttons mouse listener..
i need to display when we click these buttons

i have entire program here and coded where i have to do changes...

thanks[

[Maneesh Godbole]

Ambika,
Do you really think anyone would go through so many lines of your code? Would you?
Did you check out what SSCCE means? I had provided you a link in one of my previous post.

More about collections can be found here http://java.sun.com/docs/books/tutorial/collections/index.html

[Maya Naga]

i attached just to get some idea about my program.
i have added code where am storing the string value of all labels that i want to display in text field using next and previous buttons

just give some idea what collection method i want to use ....

                         public void Calculate(String operator)	
	              {		
		if(!error)	
		{

			decimalvalue = false;

			if(operator.equals("="))	
			{

				if(secondequal)	
				{	

					num1 = result;
					//Equal(= (ie) enter key) Pressed Twice or more						
					result = Process();			

					Display(result);				

				}	
				else
				{				

					num2 = Double.parseDouble(txtresult.getText());	

					setSecondLabel();
					//Equal(=) Sign Pressed Once
					result = Process();

					Display(result);								

					num1 = result;		

					secondequal = true;								

				}								

				secondnumber = false;
				secondvaluetrue = false;

				lblsecondnum = false;

				//putting the values into stack

				s	= lblnum1.getText();
				s1	= lblope.getText();
				s2	= lblnum2.getText();
				s3	= lbleql.getText();
				s4	= lblres.getText();
				string	= s+s1+s2+s3+s4;
			       try
				{
					
						str=string;
						arraylist.add(str);
						
					//System.out.println(str.length());
					//System.out.println(pn);				
				}
				catch(Exception e)
				{
				}
				System.out.println(string);
			}	
			else 
			{

				if(secondnumber)	
				{	

					num2 = Double.parseDouble(txtresult.getText());

					setSecondLabel();	

					result = Process();

					Display(result);

					//2nd part
					num1 = result;	

					lblnum2.setText("_");	

					lblres.setText("_");	

					lblope.setText("opr");	

					setFirstLabel(String.valueOf(result));

					secondnumber = false;		

				}	
				else 
				{			

					num1 = Double.parseDouble(txtresult.getText());	

					secondvaluetrue = true;										

					setFirstLabel();

					lblnum2.setText("_");
					//First Part

					lblres.setText("_");	

					lblope.setText("opr");

					lblsecondnum = true;
			



				}						

				sign = operator;	

				secondequal = false;
				//s=lblnum1.getText()+""+lblope.getText()+""+lblnum2.getText()+""+lbleql.getText()+""+lblres.getText();	


			}

			lblope.setText(sign);

			txtnum = "";			
		}

	}
	

	

this is next and previous buttons mouse listener

class nextListener extends MouseAdapter 	
	{
		
		public void mouseClicked(MouseEvent e)
		{
				try
				{
					itr = arraylist.listIterator();
//   					System.out.println(arraylist.length());
					while(itr.hasNext())-)
					      System.out.println(itr.next()); 
															
				}
				catch(EmptyStackException ie)
				{
					System.out.println("Error:"+ie);
					
				}
				
		}		
	}
			
	class previousListener extends MouseAdapter 	
	{
		
		public void mouseClicked(MouseEvent e)
		{
	/*			try
				{
					itr = arraylist.listIterator();
   					 while (itr.hasPrevious())
					{
					      System.out.println(itr.previous());
					}						
				}
				catch(EmptyStackException ie)
				{
					System.out.println("Error:"+ie);
					
				}*/
				
		}		
	}

thanks maneesh..