package lianxi4;
import java.awt.*;
import javax.swing.*;
public class Test extends JFrame{
MyPanel mp=null;
public Test()
{
mp=new MyPanel();
this.add(mp);
this.setSize(400, 300);
//this.setLocation(100,100);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
}
public static void main(String [] agrs)
{
Test t=new Test();
}
}
class MyPanel extends JPanel
{
public void Paint(Graphics g)
{
super.paint(g);
System.out.println("1");
g.drawOval(10, 10, 30, 30);
}
}
没画出圆形。。。。