radiobuttondemo.java

来自「java课件 java课件 java课件 java课件」· Java 代码 · 共 36 行

//<applet code="RadioButtonDemo.class" height="150" width="300">
//</applet>
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class RadioButtonDemo extends JApplet
       implements ItemListener{
   Container cp;
   JRadioButton jrb1=new JRadioButton("Windows"),
                jrb2=new JRadioButton("Linux"),
                jrb3=new JRadioButton("Solaris");
   ButtonGroup btg=new ButtonGroup();
   JTextArea ta=new JTextArea(4,20);
   JScrollPane jsp=new JScrollPane(ta);
   public void init(){
   	 btg.add(jrb1);
   	 btg.add(jrb2);
   	 btg.add(jrb3); 
   	 cp=getContentPane();
   	 cp.setLayout(new FlowLayout());
   	 cp.add(jrb1);cp.add(jrb2);cp.add(jrb3);
     cp.add(jsp);
   	 jrb1.addItemListener(this);
   	 jrb2.addItemListener(this);
   	 jrb3.addItemListener(this);
   }
   public void itemStateChanged(ItemEvent e){
     if(jrb1.isSelected())
       ta.append(jrb1.getText()+" is selected\n");
     if(jrb2.isSelected())
       ta.append(jrb2.getText()+" is selected\n");
     if(jrb3.isSelected())
       ta.append(jrb3.getText()+" is selected\n");
   }
}