Question

用java写一个鼠标单击事件驱动程序

java题目：编写程序，显示当点击鼠标时，面板上交替出现两个消息“java is fun”和“java is powerful”。

题目不难，主要是没时间想了，哪位朋友帮忙做一下，感激不尽，

Answer 1

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;

public class A extends JFrame implements MouseListener {
private int index = 0;
private String[] msgs = { "java is fun", "java is powerful" };
private JLabel lbl = new JLabel(msgs[index]);

public A() {
this.setTitle("test");
this.setSize(300, 200);

this.add(lbl);
lbl.setFocusable(false);
addMouseListener(this);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
}

public static void main(String[] args) {
new A();
}

public void mouseClicked(MouseEvent e) {
index = index == 0 ? 1 : 0;
lbl.setText(msgs[index]);
}

public void mouseEntered(MouseEvent e) {
}

public void mouseExited(MouseEvent e) {
}

public void mousePressed(MouseEvent e) {
}

public void mouseReleased(MouseEvent e) {
}

}

Answer 2

只要添加面板的MouseClick事件即可