单选组件JRadioButton

源代码：

<span style="font-size:18px;">//source code
import java.awt.Container ;
import java.awt.GridLayout ;
import java.awt.Font ;
import java.awt.event.WindowListener ;
import java.awt.event.WindowEvent ;
import java.awt.event.WindowAdapter ;
import javax.swing.JFrame ;
import javax.swing.JRadioButton ;
import javax.swing.ButtonGroup ;
import javax.swing.JPanel ;
import javax.swing.BorderFactory ;
class MyJRadio
{
   private JFrame frame = new JFrame("调查问卷") ;
   Container con = frame.getContentPane() ;
   Font fnt = new Font("楷体",Font.BOLD,20) ;
   private JRadioButton jrb1 = new JRadioButton("你妹") ;
   private JRadioButton jrb2 = new JRadioButton("尼玛") ;
   private JRadioButton jrb3 = new JRadioButton("卧槽") ;
   private JPanel pan = new JPanel()  ;
   public MyJRadio()
   {
      String title = "你是逗比吗？" ;
      pan.setBorder(BorderFactory.createTitledBorder(title)) ;
      pan.setLayout(new GridLayout(1,3)) ;
      jrb1.setFont(fnt) ;
      jrb2.setFont(fnt) ;
      jrb3.setFont(fnt) ;
      pan.add(this.jrb1) ;
      pan.add(this.jrb2) ;
      pan.add(this.jrb3) ;
      ButtonGroup group = new ButtonGroup() ;  //将所有的JRadioButton加入ButtonGroup确保单选
      group.add(jrb1) ;
      group.add(jrb2) ;
      group.add(jrb3) ;
      con.add(pan) ;
      this.frame.setSize(400,100) ;
      this.frame.setVisible(true) ;
     
      this.frame.addWindowListener(new WindowAdapter()
      {
          public void windowClosing(WindowEvent e)
          {
             System.exit(1) ;
          }
      }) ;
   }
} ;

class Tester
{
   public static void main(String args[])
   {
       MyJRadio mjr = new MyJRadio() ;
   }
} ;
</span>