Let classes talk to one another

Question

Hi,
I am doing a project in java but first I wanted to do a simple program that has three class - class with main, class for displaying buttons and a class that has a jtextarea. When you click on a button it then displays a message in the textarea.
I am having trouble letting the classes communicate. I want to have the main program as the overall controller. Please help asap.
This is the code
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.event.ActionListener;
public class project
public static void main(String[] args)
// Time time = new Time();
// System.out.println(time.getTime());
right r = new right();
left l = new left();
JPanel p = new JPanel();
JPanel p2 = new JPanel();
JPanel p3 = new JPanel();
JFrame aFrame = new JFrame();
aFrame.setTitle("Swing 3");
aFrame.setBounds(0, 0, 700, 500);
Container contentPane = aFrame.getContentPane();
p.add(l);
p.add(r);
p3.add(p);
//p3.add(p2);
contentPane.add(p3);
aFrame.setVisible(true);
class left extends project implements ActionListener
private JButton redButton,greenButton,blueButton,yellowButton;
public left()
///this.r=r;
JPanel pp = new JPanel();
setLayout(new BorderLayout());
redButton = new JButton("Red");
redButton.addActionListener(this); // step 4
greenButton = new JButton("Green");
greenButton.addActionListener(this);
blueButton = new JButton("Blue");
blueButton.addActionListener(this);
yellowButton = new JButton("Yellow");
yellowButton.addActionListener(this);
pp.add(redButton);
pp.add(greenButton);
pp.add(blueButton);
pp.add(yellowButton);
add(pp,BorderLayout.NORTH);
public void actionPerformed(ActionEvent e)
// e.getSource() // returns name of the button
if (e.getSource() == redButton){
r.textArea.setText("red");
if (e.getSource() == greenButton)
r.textArea.setText("green");
if (e.getSource() == blueButton)
r.textArea.setText("blue");
if (e.getSource() == yellowButton)
r.textArea.setText("yellow");
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.event.ActionListener;
class right extends project
JButton oneButton,twoButton;
JTextArea textArea;
public right()
JPanel jp = new JPanel();
setLayout(new BorderLayout());
oneButton = new JButton("one");
twoButton = new JButton("two");
textArea = new JTextArea();
// add(textArea,BorderLayout.SOUTH);
jp.add(oneButton);
jp.add(twoButton);
add(jp,BorderLayout.SOUTH);
add(textArea,BorderLayout.NORTH);
}

Answer 1

Hi,
I am doing a project in java but first I wanted to do
a simple program that has three class - class with
main, class for displaying buttons and a class that
has a jtextarea. When you click on a button it then
displays a message in the textarea.Google for MVC pattern (Model View Control pattern).
I am having trouble letting the classes communicate.
I want to have the main program as the overall
controller. Please help asap.Don't write asap the next time please: it sounds rude. Why should your problem be more important than other people's questions (or more important than other people's time)?
Also, when posting code, use code tags: http://forum.java.sun.com/help.jspa?sec=formatting
Thanks.