mydrawrect1.java

这个是JAVA程序基础书上第7章书实现的代码

import java.awt.*;
import java.awt.event.*;
class MyDrawRect1{
	Frame f = new Frame();
	MyCanvas c = new MyCanvas();

	public static void main(String[] args){
		new MyDrawRect1();
	}
	MyDrawRect1(){
		//增加一个窗口事件监听对象，以便可以响应诸如窗口关闭的事件
		f.addWindowListener(new MyWindowAdapter());
		f.setSize(400, 200);
		f.setLayout(new BorderLayout(0, 0));
		f.add(c, BorderLayout.CENTER);
		f.setVisible(true);
	}
    //定义一个内部类
    class MyCanvas extends Canvas{

	   //覆盖父类的同名方法,实现设定的画图目标
	   public void paint(Graphics g){  
	      g.drawRect(20, 20, 60, 40);
	      g.fillRect(100, 20,60 ,40);
	      g.drawRoundRect(180, 20, 60, 40, 20, 20);
	      g.fillRoundRect(20, 80, 60, 40, 40, 30);
	      g.draw3DRect(100, 80, 60, 40, true);
	      g.fill3DRect(180, 80, 60, 40, false);
  	   }
    }
	//定义第二个内部类
    class MyWindowAdapter extends WindowAdapter{
	   public void windowClosing(WindowEvent e){
		  System.exit(0);
	   }
    }
}