Java Swing界面编程(27)---JRadioButton事件处理

在单选button操作中。能够使用ItemListener接口进行事件的监听。

package com.beyole.util;

import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.File;

import javax.swing.BorderFactory;
import javax.swing.ButtonGroup;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;

class MyRadio1 implements ItemListener {
	private String right = "f:" + File.separator + "2.png";// 定义图片路径
	private String wrong = "f:" + File.separator + "3.png";// 定义图片路径
	private JFrame frame = new JFrame("Beyole");// 定义窗口
	private Container container = frame.getContentPane();// 得到窗口容器
	private JRadioButton jb1 = new JRadioButton("男", new ImageIcon(right), true);
	private JRadioButton jb2 = new JRadioButton("女", new ImageIcon(wrong),
			false);
	private JPanel panel = new JPanel();// 定义一个面板

	public MyRadio1() {
		panel.setBorder(BorderFactory.createTitledBorder("选择性别"));// 定义一个面板的边框显示条
		panel.setLayout(new GridLayout(1, 3));// 定义排版，一行三列
		ButtonGroup group = new ButtonGroup();// 定义一个button组
		group.add(this.jb1);// 将单选button组增加到一个组
		group.add(this.jb2);// 将单选button组增加到一个组
		panel.add(this.jb1);// 将单选button增加到面板其中
		panel.add(this.jb2);// 将单选button增加到面板其中
		jb1.addItemListener(this);// 增加监听事件
		jb2.addItemListener(this);// 增加监听事件
		container.add(panel);// 增加面板到容器中
		this.frame.setSize(200, 100);
		this.frame.setVisible(true);
		this.frame.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent arg0) {
				System.exit(1);
			}
		});
	}

	public void itemStateChanged(ItemEvent e) {
		if (e.getSource() == jb1) {
			jb1.setIcon(new ImageIcon(right));
			jb2.setIcon(new ImageIcon(wrong));
		} else {
			jb2.setIcon(new ImageIcon(right));
			jb1.setIcon(new ImageIcon(wrong));
		}
	}
}

public class JRadioButtonDemo1 {
	public static void main(String[] args) {
		new MyRadio1();
	}
}

以上程序。使用ImageIcon设置了两个单选button的图片，每次选项改变后都会触发itemStateChanged事件，之后改动每一个选项的显示图片。

程序截图：