radiogroup.java

由于想一次上传成功 所以将二个教程打包成了一个 这些例子几乎包含了所有java的框架集合

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

/*
<APPLET
    CODE=radiogroup.class
    WIDTH=340
    HEIGHT=200 >
</APPLET>
*/


public class radiogroup extends JApplet implements ItemListener
{
    JRadioButton radio1, radio2, radio3, radio4;
    ButtonGroup group; 
    JTextField text;

    public void init() 
    {
        Container contentPane = getContentPane();
        contentPane.setLayout(new FlowLayout());

        group = new ButtonGroup();

        radio1 = new JRadioButton("Radio 1");
        radio2 = new JRadioButton("Radio 2");
        radio3 = new JRadioButton("Radio 3");
        radio4 = new JRadioButton("Radio 4");

        group.add(radio1); 
        group.add(radio2); 
        group.add(radio3); 
        group.add(radio4); 

        radio1.addItemListener(this);
        radio2.addItemListener(this);
        radio3.addItemListener(this);
        radio4.addItemListener(this);

        contentPane.add(radio1);
        contentPane.add(radio2);
        contentPane.add(radio3);
        contentPane.add(radio4);

        text = new JTextField(20);

        contentPane.add(text);
    }

    public void itemStateChanged(ItemEvent e)
    {
        if (e.getItemSelectable() == radio1) {
            text.setText("You clicked radio button 1.");
        } else if (e.getItemSelectable() == radio2) {
            text.setText("You clicked radio button 2.");
        } else if (e.getItemSelectable() == radio3) {
            text.setText("You clicked radio button 3.");
        } else if (e.getItemSelectable() == radio4) {
            text.setText("You clicked radio button 4.");
        }
    }

}