circledemo.java

一些java初学者可以借鉴的代码。也是初学者的最好的学习例子

import java.awt.*;
import java.awt.geom.*;
public class CircleDemo extends Frame
{
   public static void main(String args[])
     {
        (new CircleDemo()).setVisible(true);    
     }
   public CircleDemo()
        {
            super("画圆");
            setSize(200,250);  
          }
  public void paint(Graphics g)
  {
     Graphics2D g2=(Graphics2D)g;
     g2.setColor(Color.red);
     g2.draw(new Ellipse2D.Double(40,40,100,100));
   }
}