Scroll panel problems

[Manny Ruiz]

Hello I am having alot of problems getting this scroll panel to work. Specifically I have the [panel on my GUI, but I cant figure out how to get the text area to populate it. Can someone please tell me what I a,m doing wrong here.

These are the code portions that pertain to the scroll panel only.

	private JTextArea jtextarea1;//define textarea
	private JScrollPane scrollpane1;

		scrollpane1 = new JScrollPane(jtextarea1);//creates new textarea
			addelement(contentpanel, scrollpane1, 10, 200, 350, 300);//loc for area on the panel
			jtextarea1=new JTextArea();
			addelement(scrollpane1, jtextarea1, 10, 200, 350, 300);
		    jtextarea1.setText("Month\tPrinciple Paid\tInterest Paid\tBalance\r\n");
		    jtextarea1.setEditable(false);

And here is the code as a whole.

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

import java.text.DecimalFormat;


public class mortcalwk4 extends JFrame {//begin mortcalui class

	private JLabel jlabel1, jlabel2, jlabel3, jlabel4;//defines jlabels
	private JTextField jtextfield1, jtextfield2, jtextfield3, jtextfield4;//defines jtextfields
	private JTextArea jtextarea1;//define textarea
	private JScrollPane scrollpane1;
	private JButton jbutton1, jbutton2, jbutton3; //defines buttons
    private JMenuBar menubar;//defines menu bar
    private JMenu menu;
    private JRadioButtonMenuItem ritem, ritem2, ritem3, ritem4;//defines menu radio buttons
	private JPanel contentpanel;//defines panel
	private String p,i,t;//defines string variables
    double interest[] = {5.35, 5.5, 5.75};//interest rate array
    int term[] = {84, 180, 360};//term array
    private ActionListener listener;//defines action listener
    DecimalFormat currency= new DecimalFormat ("#0.00");
    
	private void addelement(Container c, Component e, int x, int y, int h, int w){//GUI layout dimensions
		e.setBounds(x, y, h, w);
		c.add(e);
	}

	mortcalwk4(){//GUI layout
		contentpanel = (JPanel)getContentPane();
			contentpanel.setLayout(null);
		menubar=new JMenuBar(); //creates the menu bar
		menu = new JMenu ("Options");//names the menu bar
		menubar.add(menu);//adds menu bar to the gui
		    	ritem = new JRadioButtonMenuItem ("7 years at 5.35%");//title of radio button
		    		ritem.addActionListener(new ActionListener(){//event handler for ritem
		    			public void actionPerformed(ActionEvent e){
		    				jtextfield2.setText("5.35");
		    				jtextfield3.setText("7");
		    				jtextfield2.setEditable(false);
		    				jtextfield3.setEditable(false);
		    			}
		    		});
		    	ritem2 = new JRadioButtonMenuItem ("15 years at 5.5%");//title of radio button
		    		ritem2.addActionListener(new ActionListener(){//event handler for ritem2
		    			public void actionPerformed(ActionEvent e){
		    				jtextfield2.setText("5.5");
		    				jtextfield3.setText("15");
		    				jtextfield2.setEditable(false);
		    				jtextfield3.setEditable(false);
		    			}
		    		});
		    	ritem3 = new JRadioButtonMenuItem ("30 years at 5.75%");//title of radio button
		    		ritem3.addActionListener(new ActionListener(){//event handler for ritem3
		    			public void actionPerformed(ActionEvent e){
		    				jtextfield2.setText("5.75");
		    				jtextfield3.setText("30");
		    				jtextfield2.setEditable(false);
		    				jtextfield3.setEditable(false);
		    			}
		    		});
		    	ritem4 = new JRadioButtonMenuItem ("Custom Rate & Term");//title of radio button
		    		ritem4.addActionListener(new ActionListener(){//event handler for ritem4
		    			public void actionPerformed(ActionEvent e){
		    				jtextfield2.setText("");
		    				jtextfield3.setText("");
		    				jtextfield2.setEditable(true);
		    				jtextfield3.setEditable(true);
		    			}
		    		});
		    	menu.add(ritem);//adds radio button
		    	menu.add(ritem2);//adds radio button
		    	menu.add(ritem3);//adds radio button
		    	menu.add(ritem4);//adds radio button
		    	ritem.addActionListener(listener);
		    	ritem2.addActionListener(listener);
		    	ritem3.addActionListener(listener);
		    	ritem4.addActionListener(listener);
		    ButtonGroup option = new ButtonGroup();//groups buttons-only one can be selected at at time
		    	option.add(ritem);
		    	option.add(ritem2);
		    	option.add(ritem3);
		    	option.add(ritem4);
		jlabel1 = new JLabel ("Loan Amount");//name for label 1
			addelement(contentpanel, jlabel1, 0,0,100,20);//loc for label1 on the panel
		jlabel2 = new JLabel ("Interest Rate");//name for label 2
			addelement(contentpanel, jlabel2, 0,30,100,20);//loc for label2 on the panel
		jlabel3 = new JLabel ("Years");//name for label 3
			addelement(contentpanel, jlabel3, 0,60,100,20);//loc for label3 on the panel
		jlabel4 = new JLabel ("Payment Amount");//name for label 4
			addelement(contentpanel, jlabel4, 0,90,100,20);//loc for label4 on the panel
		jtextfield1 = new JTextField();//creates new textfield
			addelement(contentpanel, jtextfield1, 105, 0, 100, 20);//loc for field on the panel
			jtextfield1.addActionListener(listener);
		jtextfield2 = new JTextField("Choose options");//creates new textfield
			addelement(contentpanel, jtextfield2, 105, 30, 100, 20);//loc for field2 on the panel
			jtextfield2.addActionListener(listener);
			jtextfield2.setEditable(false);
		jtextfield3 = new JTextField("Choose options");//creates new textfield
			addelement(contentpanel, jtextfield3, 105, 60, 100, 20);//loc for field3 on the panel
			jtextfield3.addActionListener(listener);
			jtextfield3.setEditable(false);
		jtextfield4 = new JTextField();//creates new textfield
			addelement(contentpanel, jtextfield4, 105, 90, 100, 20);//loc for field4 on the panel
		scrollpane1 = new JScrollPane(jtextarea1);//creates new textarea
			addelement(contentpanel, scrollpane1, 10, 200, 350, 300);//loc for area on the panel
			jtextarea1=new JTextArea();
			addelement(scrollpane1, jtextarea1, 0, 0, 350, 300);
		    jtextarea1.setText("Month\tPrinciple Paid\tInterest Paid\tBalance\r\n");
		    jtextarea1.setEditable(false);

		jbutton1 = new JButton ("Payment");
			addelement(contentpanel, jbutton1, 0, 120, 100, 20 );
			jbutton1.addActionListener(new ActionListener(){//event handler for jbutton1
            	public void actionPerformed(ActionEvent e){
                	mortcal();//calls mortcal method
            	}
        	});//ends event handler for jbutton1

		jbutton2 = new JButton ("Clear");
			addelement(contentpanel, jbutton2, 0, 160, 80, 20 );
			jbutton2.addActionListener(new ActionListener(){//event handler for jbutton2
            	public void actionPerformed(ActionEvent e){
            	    jtextfield1.setText("");
                	jtextfield2.setText("");
                	jtextfield3.setText("");
                	jtextfield4.setText("");
                	jtextarea1.setText("");
            	}//clears all fields
        	});//ends event handler for jbutton2

		jbutton3 = new JButton ("Exit");
			addelement(contentpanel, jbutton3, 100, 160, 80, 20 );
			jbutton3.addActionListener(new ActionListener(){//event handler for jbutton3
            	public void actionPerformed(ActionEvent e){
                	System.exit(0);//exits the program
            	}
        	});//end event handler for jbutton3

		setTitle("Mortgage Payment Calculator");//set the jframe title
		setJMenuBar(menubar);
		setSize(400, 600);//set the jframe dimensions
		setLocation(new Point(150,150));//set the loc for jframe
		setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);//exit jframe
		setVisible(true);//makes jframe visible
	}//end GUI layout

	private void mortcal() {//begin mortcal method
   	 	p = jtextfield1.getText();
   	 	i = jtextfield2.getText();
   	 	t = jtextfield3.getText();
   		double loan = Double.parseDouble(p);
   		double rate = Double.parseDouble(i);
  		int month = Integer.parseInt(t)* 12;
   		double payment = (loan* ((rate / 100) / 12) / (1 - (1 / Math.pow(1 + ((rate / 100) / 12), month))));
   	
        double ipaid = 0;
        double ppaid = 0;
        double balance = 0;
   		
        for (int a=1; a < month ; a++){
   			ipaid = loan * (rate/100)/ 12; 
   			ppaid = payment - ipaid;
   			balance = loan - ppaid;
   			loan = balance;
   			
  	  	  jtextarea1.append(a + "\t" + currency.format(ppaid) 
  	  	  	+ "\t" +  currency.format(ipaid) 
  	  	  	+ "\t" +  currency.format(balance) + "\r\n"); 
   			
   		}

   	jtextfield4.setText(String.valueOf(currency.format(payment)));//outout monthly payment amounts
        }//end mortcal mathod

	public static void main(String args []){//begin main method
		new mortcalwk4();
	}//end main method
}//end mortcalui class

I am, almost done with this I just need to get the scroll panel to work. Please can someone help me out.

[Darryl Burke]

Don't use a null layout and hardcoded bounds. Use a layout manager or a combination of layout managers to achieve your layout.
http://download.oracle.com/javase/tutorial/uiswing/layout/index.html

[Darryl Burke]

This appears to be continued from https://coderanch.com/t/522325/GUI/java/Event-problems