Source of ActionTester.java

Structures and functions

public class ActionTester

  1: import java.awt.*;
  2: import java.awt.event.*;
  3: import javax.swing.*;

  5: public class ActionTester
  6: {
  7:    public static void main(String[] args)
  8:    {
  9:       JFrame frame = new JFrame();

 11:       final int FIELD_WIDTH = 20;
 12:       final JTextField textField = new JTextField(FIELD_WIDTH);
 13:       textField.setText("Click a button!");

 15:       JButton helloButton = new JButton("Say Hello");

 17:       helloButton.addActionListener(new
 18:          ActionListener()
 19:          {
 20:             public void actionPerformed(ActionEvent event)
 21:             {
 22:                textField.setText("Hello, World!");
 23:             }
 24:          });

 26:       JButton goodbyeButton = new JButton("Say Goodbye");

 28:       goodbyeButton.addActionListener(new
 29:          ActionListener()
 30:          {
 31:             public void actionPerformed(ActionEvent event)
 32:             {
 33:                textField.setText("Goodbye, World!");
 34:             }
 35:          });

 37:       frame.setLayout(new FlowLayout());

 39:       frame.add(helloButton);
 40:       frame.add(goodbyeButton);
 41:       frame.add(textField);

 43:       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 44:       frame.pack();
 45:       frame.setVisible(true);
 46:    }
 47: }