📄 dynamiceventsframe.html

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<html><head><title>Display page for DynamicEvents at www.BruceEckel.com</title></head><FONT FACE="Verdana,Tahoma,Arial,Helvetica,Sans"><H2>DynamicEvents.java</H2><hr></FONT>
<OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
    width="250" height="400" align="baseline"
    codebase="http://java.sun.com/products/plugin/1.2.2/jinstall-1_2_2-win.cab#Version=1,2,2,0">
<PARAM NAME="code" VALUE="DynamicEvents.class">
<PARAM NAME="codebase" VALUE=".">
<PARAM NAME="type" VALUE="application/x-java-applet;version=1.2.2">
<COMMENT>
    <EMBED type="application/x-java-applet;version=1.2.2" 
       width="250" height="400" align="baseline" 
       code="DynamicEvents.class" 
       codebase="."
       pluginspage="http://java.sun.com/products/plugin/1.2/plugin-install.html">
    <NOEMBED>
    </COMMENT>
       No Java 2 support for APPLET!!
    </NOEMBED></EMBED>
</OBJECT>
<FONT SIZE="+3"><PRE><B>
//: c13:DynamicEvents.java
// From 'Thinking in Java, 2nd ed.' by Bruce Eckel
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
// You can change event behavior dynamically.
// Also shows multiple actions for an event.
// &lt;applet code=DynamicEvents
//  width=250 height=400&gt;&lt;/applet&gt;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import com.bruceeckel.swing.*;

public class DynamicEvents extends JApplet {
  ArrayList v = new ArrayList();
  int i = 0;
  JButton
    b1 = new JButton("Button1"),
    b2 = new JButton("Button2");
  JTextArea txt = new JTextArea();
  class B implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      txt.append("A button was pressed\n");
    }
  }
  class CountListener implements ActionListener {
    int index;
    public CountListener(int i) { index = i; }
    public void actionPerformed(ActionEvent e) {
      txt.append("Counted Listener "+index+"\n");
    }
  }
  class B1 implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      txt.append("Button 1 pressed\n");
      ActionListener a = new CountListener(i++);
      v.add(a);
      b2.addActionListener(a);
    }
  }
  class B2 implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      txt.append("Button2 pressed\n");
      int end = v.size() - 1;
      if(end &gt;= 0) {
        b2.removeActionListener(
          (ActionListener)v.get(end));
        v.remove(end);
      }
    }
  }
  public void init() {
    Container cp = getContentPane();
    b1.addActionListener(new B());
    b1.addActionListener(new B1());
    b2.addActionListener(new B());
    b2.addActionListener(new B2());
    JPanel p = new JPanel();
    p.add(b1);
    p.add(b2);
    cp.add(BorderLayout.NORTH, p);
    cp.add(new JScrollPane(txt));
  }
  public static void main(String[] args) {
    Console.run(new DynamicEvents(), 250, 400);
  }
} ///:~
</B></PRE></FONT></body></html>
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