JRadioButton的用法

JRadioButton用法

import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.JRadioButton;
import javax.swing.ButtonGroup;
import java.awt.Dimension;
import java.awt.Color;
import java.awt.FlowLayout;

public class JRadioButtonDemo
{
 public static void main(String[] args)
 {
 
  JRadioButton red, white, cyan;
  red = new JRadioButton ("red");
  white = new JRadioButton ("white");
  cyan = new JRadioButton ("cyan");
 
  ButtonGroup group = new ButtonGroup ();
  group.add (red);
  group.add (white);
  group.add (cyan);
 
  JPanel panel = new JPanel (new FlowLayout (FlowLayout.CENTER, 1, 0));
  panel.setBackground (Color.white);
  panel.setPreferredSize (new Dimension (200,50));
  panel.add (red);
  panel.add (white);
  panel.add (cyan);
 
  JFrame frame = new JFrame("JRadioButtonDemo");
  frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
 
  frame.setContentPane(panel);
  frame.pack();
  frame.show();
 }
}