import java.applet.*;
 import javax.swing.*;
 import java.awt.*;
 import java.awt.event.*;
 class Panel1 extends JPanel{
   JRadioButton box1,box2,box3;
   ButtonGroup g;
   Panel1(){
     setLayout(new GridLayout(1,3));
     g = new ButtonGroup();
     box1 = new JRadioButton(MyWindow.fName[0]+"计算机"，false);
     box2 = new JRadioButton(MyWindow.fName[1]+"计算机"，false);
     box3 = new JRadioButton(MyWindow.fName[2]+"计算机"，false);
     g.add(box1);g.add(box2);g.add(box3);
     add(box1);add(box2);add(box3);
     add(new JLabel("计算机3选1") );
   }
 }
 class Panel2 extends JPanel{
   JCheckBox box1,box2,box3;
   ButtonGroup g;
   Panel2(){
     setLayout(new GridLayout(1,3));
     g = new ButtonGroup();
     box1 = new JCheckBox("购买1台 ");
     box2 = new JCheckBox("购买2台 ");
     box3 = new JCheckBox("购买3台 ");
     g.add(box1);g.add(box2);g.add(box3);
     add(box1);add(box2);add(box3);
     add(new JLabel(" 选择1、2或3"));
   }
 }
 class MyWindow extends JFrame implements ItemListener{
   Panel1 panel1;
   Panel2 panel2;
   JLabel label1,label2;
   JTextArea text1,text2;
   static String fName[] = {"HP","IBM","DELL"};
   static double priTbl[][]={{1.20,1.15,1.10},{1.70,1.65,1.60},{1.65,1.60,1.58}};
   static int productin = -1;
   MyWindow(String s){
     super(s);
     Container con = this.getContentPane();
     con.setLayout(new GridLayout(3,2));
     this.setLocation(100,100);
     this.setSize(400,100);
     panel1 = new Panel1();panel2 = new Panel2();
     label1 = new JLabel("产品介绍",JLabel.CENTER);
     label2 = new JLabel("产品价格",JLabel.CENTER);
     text1 = new JTextArea();text2 = new JTextArea();
     con.add(label1);con.add(label2);con.add(panel1);
     con.add(panel2);con.add(text1);con.add(text2);
     panel1.box1.addItemListener(this);
     panel1.box2.addItemListener(this);
     panel1.box3.addItemListener(this);
     panel2.box1.addItemListener(this);
     panel2.box2.addItemListener(this);
     panel2.box3.addItemListener(this);
     this.setVisible(true);this.pack();
   }
   public void itemStateChanged(ItemEvent e){ //选项状态已改变
     if(e.getItemSelectable()==panel1.box1){ //获取可选项
       production =0;
       text1.setText(fName[0]+"公司生产");text2.setText("");
     }
     else if(e.getItemSelectable()==panel1.box2){
       production =1;
       text1.setText(fName[1]+"公司生产");text2.setText("");
     }
     else if(e.getItemSelectable()==panel1.box3){
       production =2;
       text1.setText(fName[2]+"公司生产");text2.setText("");
     }
     else{
       if(production ==-1) return;
       if(e.getItemSelectable()==panel2.box1){
         text2.setText(""+priTbl[production][0]+"万元/台");
       }
       else if(e.getItemSelectable()==panel2.box2){
         text2.setText(""+priTbl[production][1]+"万元/台");
       }
       else if(e.getItemSelectable()==panel2.box3){
         text2.setText(""+priTbl[production][2]+"万元/台");
       }
     }
   }
 }
 public class Example6_2 extends Applet{
   MyWindow myWin = new MyWindow("选择项目处理示例程序");
 }