Swing常用组件之单选按钮和复选框

package ch10; 
 
import java.awt.event.*; 
 
import javax.swing.*; 
 
public class Vote extends JFrame implements ActionListener 
{ 
   private JPanel jp = new JPanel(); 
   JRadioButton jrb1 = new JRadioButton("这个网站很好，很新颖！",true); 
   JRadioButton jrb2 = new JRadioButton("这个网站很普通，太一般"); 
   JRadioButton jrb3 = new JRadioButton("这个网站很差，偶尔看一下"); 
   JRadioButton jrb4 = new JRadioButton("这个网站太差了，不来了"); 
   private JRadioButton[] jrb = new JRadioButton[]{jrb1,jrb2,jrb3,jrb4}; 
   private ButtonGroup bg = new ButtonGroup(); 
   JCheckBox jcb1 = new JCheckBox("界面比较漂亮"); 
   JCheckBox jcb2 = new JCheckBox("内容比较丰富"); 
   JCheckBox jcb3 = new JCheckBox("增值服务比较好"); 
   JCheckBox jcb4 = new JCheckBox("会员服务比较好"); 
   private JCheckBox[] jcb =new JCheckBox[]{jcb1,jcb2,jcb3,jcb4}; 
   private JButton [] jb = {new JButton("我要投票"),new JButton("我要重选")}; 
   private JLabel[] jl = {new JLabel("这个网站给你的印象是："),new JLabel("您认为本站哪里做的比较好"),new JLabel("您投票的内容是：")}; 
   private JTextArea jt = new JTextArea(); 
   private JScrollPane js= new JScrollPane(jt); 
   public Vote() 
   { 
     jp.setLayout(null); 
     for(int i=0;i<4;i++) 
     { 
       jrb[i].setBounds(30+170*i,40,170,30); 
       jcb[i].setBounds(30+120*i,100,120,30); 
       jp.add(jrb[i]); 
       jp.add(jcb[i]); 
       jcb[i].addActionListener(this); 
       jrb[i].addActionListener(this); 
       bg.add(jrb[i]); 
       if(i>1) 
         continue; 
       jl[i].setBounds(20,20+50*i,200,30); 
       jb[i].setBounds(380+120*i,200,100,20); 
       jp.add(jl[i]); 
       jp.add(jb[i]); 
       jb[i].addActionListener(this); 
     } 
     jl[2].setBounds(20,150,120,30); 
     jp.add(jl[2]); 
     js.setBounds(120,150,500,50); 
     jp.add(js); 
     jt.setLineWrap(true); 
     jt.setEditable(false); 
     this.add(jp); 
     this.setTitle("网站满意调查表"); 
     this.setBounds(150,150,750,300); 
     this.setVisible(true); 
     this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
   } 
   public void actionPerformed(ActionEvent a) 
   { 
     if(a.getSource()==jb[1]) 
     { 
       bg.clearSelection(); 
       for(int i=0;i<jcb.length;i++) 
         jcb[i].setSelected(false); 
       jt.setText(""); 
     } 
     else 
     { 
       StringBuffer temp1 = new StringBuffer("你认为这个网站"); 
       StringBuffer temp2 = new StringBuffer(""); 
       for(int i=0;i<4;i++) 
       { 
         if(jrb[i].isSelected()) 
           temp1.append(jrb[i].getText()); 
         if(jcb[i].isSelected()) 
           temp2.append(jcb[i].getText()+","); 
       } 
       if(temp2.length()==0) 
         jt.setText("请将两项调查都选择"); 
       else 
       { 
         temp1.append("你认为这个网站"); 
         temp1.append(temp2.substring(0,temp2.length()-1)); 
         jt.setText(temp1.toString()); 
       } 
     } 
   } 
   public static void main(String args[]) 
   { 
     new Vote(); 
   } 
}