java例程练习（匿名类用法）-优快云博客

本文提供两个Java GUI编程实例，一是使用匿名类实现窗口关闭功能，二是通过监听鼠标点击绘制圆形的简单画图程序。这两个例子展示了如何在Java中创建基本的图形用户界面，并通过事件监听器来响应用户操作。

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//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();
	}
}

//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<Point> points = null;
	MyFrame(String s) {
		super(s);
		points = new ArrayList<Point>();
		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<Point> 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();
	}
}