du39.java

清华大学java2 程序设计基础的绘图中的再现,希望喜欢,也是很不错的一些程序！

import java.awt.*;
import java.awt.event.*;
public class du39 extends Frame implements ActionListener
{
	static du39 frm=new du39();
	static Button b1=new Button("画圆");
	static Button b2=new Button("画椭圆");
	
	public static void main(String args[])
	{
		frm.setTitle("画图");
		frm.setSize(300,250);
		frm.setLayout(null);
		frm.setLocation(50,50);
		frm.add(b1);
		frm.add(b2);
		b1.setBounds(90,215,50,25);
		b2.setBounds(160,215,50,25);
		b1.addActionListener(frm);
		b2.addActionListener(frm);
		frm.setVisible(true);
	}
	public void actionPerformed(ActionEvent e)
	{
		Button bt=(Button)e.getSource();
		Graphics g=getGraphics();
		g.setFont(new Font("楷体_GB2312",Font.BOLD,20));
		g.setColor(Color.red);
		if(bt==b1) 
		{
			g.clearRect(0, 0, 300, 250);
			g.drawString("圆", 100, 50);
			g.drawOval(100, 90, 70, 70);
		}
		else if(bt==b2) 
		{
			g.clearRect(0, 0, 300, 250);
			g.drawString("椭圆", 150, 50);
			g.drawOval(80, 60, 70, 120);
		}
		
		paint(g);
	}
	
	
}