java例程练习（匿名类用法）

//用匿名类实现关闭窗口功能
import java.awt.*;
import java.awt.event.*;
public class TestAnony {
Frame f = new Frame("Test");
TextField tf = new TextField(10);
Button b1 = new Button("Start");

public TestAnony() {
f.add(b1, BorderLayout.NORTH);
f.add(tf, BorderLayout.SOUTH);

b1.addActionListener(new ActionListener() {
private int i;
public void actionPerformed(ActionEvent e) {
tf.setText(e.getActionCommand() + ++i);
}
});

f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
f.setVisible(false);
System.exit(0);
}
});

f.pack();
f.setVisible(true);

}

public static void main(String[] args) {
new TestAnony();
}
}
[java]
//简单的画图程序
//注意repaint()方法的使用
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class TestMyMouseAdater {
public static void main(String[] args) {
new MyFrame("Drawing ......");
}
}

class MyFrame extends Frame {
ArrayList points = null;
MyFrame(String s) {
super(s);
points = new ArrayList();
setLayout(null);
setBounds(300, 300, 400, 400);
setBackground(new Color(204, 204, 255));
setVisible(true);
this.addMouseListener(new Monitor());
//this.addWindowListener(new MyWindowMonitor());

//匿名类写法：
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
setVisible(true);
System.exit(0);
}
});
}

//内部类
/*class MyWindowMonitor extends WindowAdapter {
public void windowClosing(WindowEvent e) {
setVisible(false);
System.exit(0);
}
}*/

public void paint(Graphics g) {
Iterator i = points.iterator();
while(i.hasNext()) {
Point p = i.next();
g.setColor(Color.blue);
g.fillOval(p.x, p.y, 10, 10);
}
}

public void addPoint(Point p) {
points.add(p);
}
}

class Monitor extends MouseAdapter {
public void mousePressed(MouseEvent e) {
MyFrame f = (MyFrame)e.getSource();
f.addPoint(new Point(e.getX(), e.getY()));
f.repaint();
}
}

摘自 Yours风之恋