Java快速上手之实验七

1．编写鼠标事件响应程序MouseEventDemo.java，当鼠标进入和离开窗口时给出相应显示，当按下、弹起时显示当前鼠标的坐标值。

2．编写鼠标事件响应程序MouseMotionEventDemo.java，当鼠标在窗口内移动时显示鼠标的坐标值。

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;public class MouseEventDemo {public static void main(String[] args) {// 创建主窗口JFrame frame = new JFrame("鼠标事件");frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setSize(400, 400);frame.setLayout(new BorderLayout());// 创建显示区域JPanel panel = new JPanel();panel.setBackground(Color.GREEN);frame.add(panel, BorderLayout.CENTER);// 创建状态栏，用于显示鼠标事件信息JLabel statusLabel = new JLabel(" ");statusLabel.setHorizontalAlignment(SwingConstants.CENTER);frame.add(statusLabel, BorderLayout.SOUTH);// 添加鼠标监听器panel.addMouseListener(new MouseListener() {@Overridepublic void mouseClicked(MouseEvent e) {statusLabel.setText("鼠标左键单击 坐标(" + e.getX() + "," + e.getY() + ")");}@Overridepublic void mousePressed(MouseEvent e) {statusLabel.setText("鼠标按下 坐标(" + e.getX() + "," + e.getY() + ")");}@Overridepublic void mouseReleased(MouseEvent e) {statusLabel.setText("鼠标弹起 坐标(" + e.getX() + "," + e.getY() + ")");}@Overridepublic void mouseEntered(MouseEvent e) {statusLabel.setText("鼠标进入窗口");}@Overridepublic void mouseExited(MouseEvent e) {statusLabel.setText("鼠标离开窗口");}});// 设置窗口可见frame.setVisible(true);}
}2.
import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;public class MouseMotionEventDemo {public static void main(String[] args) {// 创建主窗口JFrame frame = new JFrame("鼠标移动事件");frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setSize(400, 400);frame.setLayout(new BorderLayout());// 创建显示区域JPanel panel = new JPanel();panel.setBackground(Color.YELLOW);// 创建状态栏，用于显示鼠标坐标JLabel statusLabel = new JLabel("鼠标移动事件");// 添加鼠标移动监听器panel.addMouseMotionListener(new MouseMotionListener() {@Overridepublic void mouseDragged(MouseEvent e) {// 不处理拖拽事件}@Overridepublic void mouseMoved(MouseEvent e) {// 更新状态栏显示鼠标坐标statusLabel.setText("鼠标移动, 坐标(" + e.getX() + "," + e.getY() + ")");}});// 将组件添加到窗口frame.add(panel, BorderLayout.CENTER);frame.add(statusLabel, BorderLayout.SOUTH);// 设置窗口可见frame.setVisible(true);}
}