用匿名类实现事件处理

[java]代码库

import java.awt.*;
import java.awt.event.*;

public class AnonymousClass {
	private Frame f;
	private TextField tf;

	public AnonymousClass() {
		f = new Frame("Inner classes example");
		tf = new TextField(30);
	}

	public void launchFrame() {
		Label label = new Label("Click and drag the mouse");
		f.add(label, BorderLayout.NORTH);
		f.add(tf, BorderLayout.SOUTH);
		f.addMouseMotionListener(new MouseMotionAdapter() { // 匿名类开始
			public void mouseDragged(MouseEvent e) {
				String s = "Mouse dragging: x=" + e.getX() + "Y=" + e.getY();
				tf.setText(s);
			}
		}); // 匿名类结束
		f.setSize(300, 200);
		f.setVisible(true);
	}

	public static void main(String args[]) {
		AnonymousClass obj = new AnonymousClass();
		obj.launchFrame();
	}
}