ShowAddListeners.java

//: c13:ShowAddListeners.java
// From 'Thinking in Java, 2nd ed.' by Bruce Eckel
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
// Display the "addXXXListener" methods of any 
// Swing class.
// <applet code = ShowAddListeners 
// width=500 height=400></applet>
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.lang.reflect.*;
import java.io.*;
import com.bruceeckel.swing.*;
import com.bruceeckel.util.*;

public class ShowAddListeners extends JApplet {
  Class cl;
  Method[] m;
  Constructor[] ctor;
  String[] n = new String[0];
  JTextField name = new JTextField(25);
  JTextArea results = new JTextArea(40, 65);
  class NameL implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      String nm = name.getText().trim();
      if(nm.length() == 0) {
        results.setText("No match");
        n = new String[0];
        return;
      }
      try {
        cl = Class.forName("javax.swing." + nm);
      } catch(ClassNotFoundException ex) {
        results.setText("No match");
        return;
      }
      m = cl.getMethods();
      // Convert to an array of Strings:
      n = new String[m.length];
      for(int i = 0; i < m.length; i++)
        n[i] = m[i].toString();
      reDisplay();
    }
  } 
  void reDisplay() {
    // Create the result set:
    String[] rs = new String[n.length];
    int j = 0;
    for (int i = 0; i < n.length; i++)
      if(n[i].indexOf("add") != -1 &&
        n[i].indexOf("Listener") != -1)
          rs[j++] = 
            n[i].substring(n[i].indexOf("add"));
    results.setText("");
    for (int i = 0; i < j; i++)
      results.append(
        StripQualifiers.strip(rs[i]) + "\n");
  }
  public void init() {
    name.addActionListener(new NameL());
    JPanel top = new JPanel();
    top.add(new JLabel(
      "Swing class name (press ENTER):"));
    top.add(name);
    Container cp = getContentPane();
    cp.add(BorderLayout.NORTH, top);
    cp.add(new JScrollPane(results));
  }
  public static void main(String[] args) {
    Console.run(new ShowAddListeners(), 500,400);
  }
} ///:~