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// : 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
.compile("(add\\w+?Listener\\(.*?\\))");
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");
return;
}
Class klass;
try {
klass = Class.forName("javax.swing." + nm);
} catch (ClassNotFoundException ex) {
results.setText("No match");
return;
}
Method[] methods = klass.getMethods();
results.setText("");
for (int i = 0; i < methods.length; i++) {
Matcher matcher = addListener.matcher(methods[i].toString());
if (matcher.find())
results.append(qualifier.matcher(matcher.group(1))
.replaceAll("")
+ "\n");
}
}
}
public void init() {
NameL nameListener = new NameL();
name.addActionListener(nameListener);
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));
// Initial data and test:
name.setText("JTextArea");
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.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(applet);
frame.setSize(width, height);
applet.init();
applet.start();
frame.setVisible(true);
}
} ///:~
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