rectpanel1.java

运用类Panel设置颜色

//RectEg.java
import java.awt.*;
import java.applet.Applet;
public class RectPanel1 extends Applet{
 public void init(){
  setLayout(new BorderLayout());
  MyPanel1 p=new MyPanel1();
  p.setBackground(Color.green);        //设置面板颜色
  p.setSize(300,300);                  //设置面板大小
  add(p,BorderLayout.CENTER);
 }
}
class MyPanel1 extends Panel{         //重置了类Panel中的Paint()方法
 public void paint(Graphics g)
 {g.setColor(Color.red);
  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);}
}