rectpanel.java

运用类Panel设置颜色

//RectPanel.java
import java.awt.event.*;
import java.awt.*;
public class RectPanel extends WindowAdapter{
 MyPanel myp=new MyPanel();
 RectPanel(){
  Frame win1=new Frame("面板上各种不同的矩形");
  win1.setLayout(new BorderLayout(0,0));
  win1.addWindowListener(this);
  win1.add(new Label("在面板上画各种不同的矩形"),BorderLayout.NORTH);
  myp.setBackground(Color.yellow);   //设置面板颜色
  myp.setSize(500,200);              //设置面板大小
  win1.add(myp,BorderLayout.CENTER);
  win1.setSize(300,200);             //设置窗口大小
  win1.setVisible(true);
 }
 public static void main(String[] args){
   new RectPanel();
 }
 public void windowClosing(WindowEvent e){
   System.exit(0);
 }
}
class MyPanel 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);
  }
}