Display the addXXXListener methods of any Swing class : Various Event Listener « Event « Java

Display the addXXXListener methods of any Swing class

Display the addXXXListener methods of any Swing class

// : c14:ShowAddListeners.java
// Display the "addXXXListener" methods of any Swing class.
// <applet code=ShowAddListeners
// width=500 height=400></applet>
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.lang.reflect.Method;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.swing.JApplet;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class ShowAddListeners extends JApplet {
  private JTextField name = new JTextField(25);

  private JTextArea results = new JTextArea(40, 65);

  private static Pattern addListener = Pattern

  private static Pattern qualifier = Pattern.compile("\\w+\\.");

  class NameL implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      String nm = name.getText().trim();
      if (nm.length() == 0) {
        results.setText("No match");
      Class klass;
      try {
        klass = Class.forName("javax.swing." + nm);
      } catch (ClassNotFoundException ex) {
        results.setText("No match");
      Method[] methods = klass.getMethods();
      for (int i = 0; i < methods.length; i++) {
        Matcher matcher = addListener.matcher(methods[i].toString());
        if (matcher.find())
              + "\n");

  public void init() {
    NameL nameListener = new NameL();
    JPanel top = new JPanel();
    top.add(new JLabel("Swing class name (press ENTER):"));
    Container cp = getContentPane();
    cp.add(BorderLayout.NORTH, top);
    cp.add(new JScrollPane(results));
    // Initial data and test:
    nameListener.actionPerformed(new ActionEvent("", 0, ""));

  public static void main(String[] args) {
    run(new ShowAddListeners(), 500, 400);

  public static void run(JApplet applet, int width, int height) {
    JFrame frame = new JFrame();
    frame.setSize(width, height);
} ///:~


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