Java捕获选项事件ItemEvent-优快云博客

本文介绍了一个使用Java Swing实现的选项事件处理示例。通过监听 JComboBox 控件的状态变化，可以捕捉到选项被选中或取消选中的事件，并打印相应的消息。

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package com.han;

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.util.Vector;

import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;

/**
 * 捕获选项事件ItemEvent
 * @author HAN
 *
 */
public class ItemEvent_1 extends JFrame {

	/**
	 * 
	 */
	private static final long serialVersionUID = -9005090453541883935L;

	public ItemEvent_1() {
		// TODO Auto-generated constructor stub
		Container container = getContentPane();
		container.setLayout(new FlowLayout());
		Vector<String> vector = new Vector<String>();
		for (int i = 1; i<6; i++) 
			vector.add("选项" + i);
		DefaultComboBoxModel<String> defaultComboBoxModel = 
				new DefaultComboBoxModel<String>(vector);
		JComboBox<String> comboBox = new JComboBox<String>(defaultComboBoxModel);
		container.add(comboBox);
		comboBox.addItemListener(new ItemListener() {

			@Override
			public void itemStateChanged(ItemEvent e) {
				// TODO Auto-generated method stub
				String item = e.getItem().toString();
				int stateChange = e.getStateChange();
				if (stateChange == ItemEvent.SELECTED) {
					System.out.println("此次事件由选中“" + item + "”触发！");
				}else if (stateChange == ItemEvent.DESELECTED) {
					System.out.println("此次事件由取消选中“" + item + "”触发！");
				}else {
					System.out.println("此次事件由其它原因触发！");
				}
			}
			
		});
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		ItemEvent_1 frame = new ItemEvent_1();
		frame.setTitle("选项事件示例");
		frame.setVisible(true);
		frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
		frame.setBounds(0, 0, 300, 100);
	}

}