e1107.java

java小程序

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class E1107 extends JFrame implements ActionListener
{
private Timer t;
private int x[]={10,100,200,300,150};
private int y[]={80,30,60,120,150};
private int l=0; 


public E1107()
{
super("E1107:动态画多边形");
t=new Timer(1000,this);
t.start();
setSize(400,200);
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)//定义关闭窗口方法 
{
t.stop();
System.exit(0);
}
});
setVisible(true);
}

public void actionPerformed(ActionEvent e)//响应各种事件
{
Graphics g=getGraphics();
g.setColor(Color.red);
if(l==x.length-1)
{
g.drawLine(x[x.length-1],y[y.length-1],x[0],y[0]);
//g.drawLine(x[0],y[0],x[1],y[1]);
l=0;
}
g.drawLine(x[l],y[l],x[l+1],y[l+1]);
g.dispose();
l++;

}

public void paint(Graphics g)
{
g.setColor(Color.red);
g.drawLine(x[0],y[0],x[0],y[0]);
}

public static void main(String args[])
{
E1107 app=new E1107();
app.addWindowListener(new MyWindowListener());
}
}