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:       textField = new JTextField(FIELD_WIDTH);
 13:       textField.setText("Click a button!");

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

 17:       helloButton.addActionListener(
 18:          createGreetingButtonListener("Hello, World!"));

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

 22:       goodbyeButton.addActionListener(
 23:          createGreetingButtonListener("Goodbye, World!"));

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

 27:       frame.add(helloButton);
 28:       frame.add(goodbyeButton);
 29:       frame.add(textField);

 31:       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 32:       frame.pack();
 33:       frame.setVisible(true);
 34:    }

 36:    public static ActionListener createGreetingButtonListener(
 37:       final String message)
 38:    {
 39:       return new
 40:          ActionListener()
 41:          {
 42:             public void actionPerformed(ActionEvent event)
 43:             {
 44:                textField.setText(message);
 45:             }
 46:          };
 47:    }

 49:    private static JTextField textField;
 50: }