urgent:override a jrame

[oghenekaro EFEKODO]

need help in making my application dispaly with the dialog box appearing at the center.The "InputDialog.java" contains the dialog i want to appear at the center of th "FoodFrame.java" class.pls somebody help me out.

codes:
//InputDialog.java

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import static javax.swing.GroupLayout.Alignment.*;
import java.sql.*;
 
public class InputDialog extends JDialog {
private JTextField infield,ddF,wkF,mmF,yyF;
private JLabel inlabel;
final ButtonGroup group,group1;
private JRadioButton dd,wk,mm,yy,addweight,lossweight,stress,diabietic,gn;
private JButton ok;

//private FoodFrame ff;

public InputDialog(JFrame f){
super(f,"",true);

JPanel p1 = new JPanel();
p1.setLayout(null);
p1.setPreferredSize(new Dimension(180,45));
p1.setBorder(BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder(),"",TitledBorder.CENTER,TitledBorder.TOP));

inlabel = new JLabel();
inlabel.setText("Amount To Spend");
inlabel.setBounds(60,10,140,30);
p1.add(inlabel);

infield = new JTextField(10);
infield.setBounds(170,10,80,25);
p1.add(infield); 

JPanel p2 = new JPanel();
p2.setLayout(null);
p2.setPreferredSize(new Dimension(200,110));
p2.setBorder(BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder(),"",TitledBorder.CENTER,TitledBorder.TOP));

dd = new JRadioButton("Number of Day Plan");
//dd.addItemListener(this);
dd.setBounds(10,20,140,20);
p2.add(dd);

ddF = new JTextField();
ddF.setBounds(160,20,30,20);
p2.add(ddF);

wk = new JRadioButton("Number of Week Plan");
wk.setBounds(10,45,150,20);
p2.add(wk);

wkF = new JTextField();
wkF.setBounds(160,45,30,20);
p2.add(wkF);

mm = new JRadioButton("Number of Month Plan");
mm.setBounds(10,70,150,20);
p2.add(mm);

mmF = new JTextField();
mmF.setBounds(160,70,30,20);
p2.add(mmF);

yy = new JRadioButton("Year Plan");
yy.setBounds(10,90,100,20);
p2.add(yy);

yyF = new JTextField();
yyF.setBounds(90,90,30,20);
p2.add(yyF);

group = new ButtonGroup();
group.add(dd);
group.add(wk);
group.add(mm);
group.add(yy);

JPanel p3 = new JPanel();
p3.setBorder(BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder(),"",TitledBorder.CENTER,TitledBorder.TOP));
p3.setPreferredSize(new Dimension(150,105));
p3.setLayout(null);

addweight = new JRadioButton("Add Weight Diet");
addweight.setBounds(5,15,120,15);
p3.add(addweight);

lossweight = new JRadioButton("Loss Weight Diet");
lossweight.setBounds(5,35,140,15);
p3.add(lossweight);

stress = new JRadioButton("Manage Stress Diet");
stress.setBounds(5,55,140,15);
p3.add(stress);

diabietic = new JRadioButton("Diabietics Diet");
diabietic.setBounds(5,75,140,15);
p3.add(diabietic);

gn = new JRadioButton("General Food");
gn.setBounds(5,95,140,15);
p3.add(gn);

group1 = new ButtonGroup();
group1.add(addweight);
group1.add(lossweight);
group1.add(stress);
group1.add(diabietic);
group1.add(gn);

JPanel pan = new JPanel();
GroupLayout layout = new GroupLayout(pan);
layout.setAutoCreateGaps(true);
layout.setAutoCreateContainerGaps(true);
pan.setLayout(layout);

layout.setHorizontalGroup(layout.createSequentialGroup()
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addComponent(p2)
)
.addPreferredGap(LayoutStyle.ComponentPlacement.RELATED,GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
 
.addComponent(p3)
)

);
layout.setVerticalGroup(layout.createSequentialGroup()

.addGroup(layout.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(p2)
.addComponent(p3)
)

);

JPanel okpanel = new JPanel();
okpanel.setPreferredSize(new Dimension(200,30));
okpanel.setLayout(null);

ok = new JButton("OK");
ok.setBorder(BorderFactory.createEmptyBorder(0,0,0,0));
ok.setRolloverEnabled(false);
ok.setBounds(150,0,60,20);
ok.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
//if(dd.isSelected() )
//System.out.println(ddF.getText()+"  Day" );
//new FoodFrame();
//ff.southPanel(currentamountfield.setText(infield.getText()));
}
});

okpanel.add(ok);


JPanel container = new JPanel();
container.setPreferredSize(new Dimension(420,290));

GroupLayout lyn = new GroupLayout(container);
container.setLayout(lyn);

lyn.setAutoCreateGaps(true);
lyn.setAutoCreateContainerGaps(true);
lyn.setHorizontalGroup(lyn.createSequentialGroup()
.addGroup(lyn.createParallelGroup(GroupLayout.Alignment.LEADING)
.addComponent(p1)
.addComponent(pan)
.addComponent(okpanel)
)

);
lyn.setVerticalGroup(lyn.createSequentialGroup()
.addGroup(lyn.createParallelGroup(GroupLayout.Alignment.LEADING)
.addGroup(lyn.createSequentialGroup()
.addGroup(lyn.createParallelGroup(GroupLayout.Alignment.BASELINE)
.addComponent(p1)
)
.addComponent(pan)
.addComponent(okpanel)
)
)
);
add(container);

setSize(420,290);
setLocationRelativeTo(f);
toFront();
setVisible(true);
//setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
}
/*public void itemStateChanged(ItemEvent e){
if(dd.isSelected() )
System.out.println(ddF.getText()+"  Day" );
}
public static void main(String[] arg){
SwingUtilities.invokeLater(new Runnable(){
public void run(){
new InputDialog().setVisible(true);
}
});
}*/
}    

code 2:
//FoodFrame.java

  
 import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.table.*;
import java.sql.*;
import java.util.*;
 
public class FoodFrame extends JFrame{
private Connection con;
private Statement st;
private ResultSet rs;
private JButton printbutton,deletebutton;
private int ii;
private JList foodlist;
private DefaultListModel listmodel;
private JComboBox items;
private JTextField field;
private JTable table;
private DefaultTableModel tablemodel;
public FoodFrame(){

try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con = DriverManager.getConnection("jdbc :-o	 dbc:food","","");
}
catch(Exception e){
JOptionPane.showMessageDialog(this,e,"",JOptionPane.INFORMATION_MESSAGE);
}
 
JPanel pp = new JPanel();
pp.setLayout(null);
pp.setPreferredSize(new Dimension(300,50));

printbutton = new JButton("Print");
printbutton.setRolloverEnabled(false);
printbutton.setBounds(30,20,80,30);
pp.add(printbutton);

deletebutton = new JButton("Delete");
deletebutton.setRolloverEnabled(false);
deletebutton.setBounds(115,20,80,30);
pp.add(deletebutton);

JPanel ps = new JPanel();
ps.setBorder(BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder(),"",TitledBorder.CENTER,TitledBorder.TOP));
ps.setPreferredSize(new Dimension(300,250));
ps.add(BorderLayout.NORTH,eastpanel());
ps.add(BorderLayout.SOUTH,pp);

JPanel p = new JPanel();
p.setBorder(BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder(),"",TitledBorder.CENTER,TitledBorder.TOP));
p.setLayout(new BoxLayout(p,BoxLayout.X_AXIS));
p.setPreferredSize(new Dimension(550,260));
p.add(westpanel());
p.add(ps);

Container c = getContentPane();
c.setLayout(new BoxLayout(c,BoxLayout.Y_AXIS));
c.add(p);
c.add(southpanel());

new InputDialog(new JFrame() );

setSize(640,450);
toBack();
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
public JPanel westpanel(){

String[] qtybox={"--select--","cup(s)","mudu(s)","bottle(s)","1/2bag","bag(s)","tuber(s)","Unit(s)","Loaf(s)"};

JPanel listpanel = new JPanel();
listpanel.setLayout(null);
listpanel.setPreferredSize(new Dimension(80,250));
listpanel.setBorder(BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder(),"",TitledBorder.CENTER,TitledBorder.TOP));

listmodel = new DefaultListModel();
foodlist = new JList(listmodel);
foodlist.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        foodlist.setSelectedIndex(0);
        foodlist.setVisibleRowCount(5);
        
        JScrollPane pane = new JScrollPane(foodlist);
        pane.setBounds(20,20,155,220);
        listpanel.add(pane);
        
        JLabel qty = new JLabel("Quantity");
        qty.setBounds(10,260,60,20);
        listpanel.add(qty);
        
        field = new JTextField();
        field.setBounds(65,260,30,20);
        listpanel.add(field);
        
        items = new JComboBox(qtybox);
        items.setBounds(95,260,80,20);
        items.addActionListener(new ActionListener(){
        public void actionPerformed(ActionEvent e){
        if(e.getSource()==items){
        showfood();
        }
        }
        });
        listpanel.add(items);
        
        //
        showfood();            
        
        return listpanel;
}
public JScrollPane eastpanel(){


tablemodel = new DefaultTableModel();
tablemodel.addColumn("Number");
tablemodel.addColumn("Food Item");
tablemodel.addColumn("Quantity");
tablemodel.addColumn("Price");
tablemodel.addColumn("Description");

table = new JTable(tablemodel);

TableColumn column = null;
for (int i = 0; i < 5; i++) {
    column = table.getColumnModel().getColumn(i);
    
    if(i==0){
        column.setPreferredWidth(65);
    }
    else if(i==1){
        column.setPreferredWidth(100);
    }
    else if(i==2){
        column.setPreferredWidth(65);
    }
    else if(i==3){
        column.setPreferredWidth(65);
    }
    else{
        column.setPreferredWidth(100);
    }
}

JScrollPane scroll = new JScrollPane(table);
scroll.setPreferredSize(new Dimension(400,230));

//showfood(tablemodel);
return scroll;
}
public JPanel southpanel(){
JButton finish;
JTextField currentamountfield,amountspentfield;
JLabel currentamountlabel,amountspentlabel;

JPanel panel = new JPanel();
panel.setPreferredSize(new Dimension(550,40));
panel.setLayout(null);

finish = new JButton("Finish");
finish.setRolloverEnabled(false);
finish.setBounds(190,10,80,30);
panel.add(finish);

currentamountlabel = new JLabel("Current Amount");
currentamountlabel.setBounds(350,5,120,20);
panel.add(currentamountlabel);

currentamountfield = new JTextField();
currentamountfield.setEnabled(false);
currentamountfield.setBounds(450,5,50,20);
panel.add(currentamountfield);

amountspentlabel = new JLabel("Amount Spent");
amountspentlabel.setBounds(360,30,120,20);
panel.add(amountspentlabel);

amountspentfield = new JTextField();
amountspentfield.setEnabled(false);
amountspentfield.setBounds(450,30,50,20);
panel.add(amountspentfield);

return panel;
}
//public void showfood(){
//showfood(DefaultListModel listmodel,JComboBox items,JTextField field,JList foodlist,DefaultTableModel tablemodel);
//}
public void showfood(){
 try{
        st = con.createStatement();
        rs = st.executeQuery("select tbl_food.food_name from tbl_food");
        while(rs.next()){
        listmodel.addElement(rs.getString(1));
        }
        ii =ii+1;
        Vector<Object> data = new Vector<Object>();
        data.addElement(ii);
        data.addElement(foodlist.getSelectedValue());
        data.addElement(field.getText()+"  "+items.getSelectedItem());
        data.addElement("");
        data.addElement("");
        tablemodel.addRow(data);
        
         }catch(Exception ex){}
}
public static void main(String[] arg){
new FoodFrame().setVisible(true);
}
} 

[Rob Spoor]

InputDialog dialog;
FoodFrame frame;
 
dialog.setLocation(
    frame.getX() + frame.getWidth() / 2 - dialog.getWidth() / 2,
    frame.getY() + frame.getHeight() / 2 - dialog.getHeight() / 2
);

frame.getX() + frame.getWidth() / 2 is the horizontal center of the frame. You then subtract half of the dialog width, so its left and right are both half of the dialog width off the center. In other words, the dialog is centered.

Please make sure you don't pack() your dialog or frame after centering, otherwise the centering size will not be the actual size on screen.

[Maneesh Godbole]

You can also try using dialog.setLocationRelativeTo(Component comp)
If comp is null, the window is displayed centered on the screen, else the window is displayed centered on the comp.

[Nathan Pruett]

Swing/AWT actually has a built in method for this now...

Window.setLocationRelativeTo(Component)

if you pass null into it it will center the Window/JFrame/JDialog on the screen (based on size). If you call:

dialog.setLocationRelativeTo(frame);

it will center the dialog over the center of the frame (the frame has to be visible at the time this is called for it to work).

[Gregg Bolinger]

Ease Up. We'd appreciate it if you would edit your post and remove Urgent from the subject.