actioneventtest.java

《Java程序设计与应用》-张仕斌-源程序 《Java程序设计与应用》-张仕斌-源程序

//ActionEventTest.java
import java.awt.*;
import java.awt.event.*;    //引用事件包
import javax.swing.*;

//该类实现了ActionListener接口,用于监听动作事件
public class ActionEventTest extends JFrame implements ActionListener {
	private TextField tf = null;
	private JLabel prompt = null;
	private JLabel result = null;
	
	public ActionEventTest() {  //构造函数
		super("ActionEvent Test");
		tf = new TextField(10);
		prompt = new JLabel("请输入你的名字:");
		result = new JLabel();
		
		this.getContentPane().setLayout(new FlowLayout());
		this.getContentPane().add(prompt);
		this.getContentPane().add(tf);
		this.getContentPane().add(result);
		
		tf.addActionListener(this);     //为文件框添加动作监听器
	}
	
	//以下方法是动作监听接口的抽象方法,必须实现
	public void actionPerformed(ActionEvent e) {
		result.setText("你输入了:" + tf.getText());
	}
	
	public static void main(String[]args) {
		ActionEventTest aet = new ActionEventTest();
		aet.setSize(400,100);
		aet.setDefaultCloseOperation(EXIT_ON_CLOSE);
		aet.setVisible(true);
	}
}