buttoncontrol.java

java课程的资料以及实验的代码

import java.awt.*;//导入抽象窗口工具包
import java.awt.event.*;
//
class ButtonControl extends Frame implements ActionListener{
	Button  btnDisplay;
	Label lblMsg;
	public ButtonControl(){
		super("按钮控件演示程序");
		btnDisplay = new Button("显示消息");
		lblMsg = new Label("");
		add(btnDisplay,BorderLayout.NORTH);
		add(lblMsg);
		btnDisplay.addActionListener(this);
		setSize(200,200);
		setVisible(true);
	}
	public void actionPerformed (ActionEvent ae){
		if (ae.getActionCommand().equals("显示消息")){
			btnDisplay.setLabel("隐藏消息");
			lblMsg.setText("你好，世界!");
		}
		else if (ae.getActionCommand().equals("隐藏消息")){
			btnDisplay.setLabel("显示消息");
			lblMsg.setText("");
		}
	}
	public static void main(String[] args){
		new ButtonControl();
	}
}