Java AWT鼠标事件全解析

要执行这些 Java AWT 程序你需要将它们分别保存为独立的.java文件并使用javac和java命令进行编译和运行。以下是每个程序的执行步骤和功能说明。1.程序清单 1:MouseEventsDemo.java此程序演示了鼠标事件处理包括点击、进入、退出、按下、释放、拖动和移动事件。// 保存为 MouseEventsDemo.java import java.awt.*; import java.awt.event.*; public class MouseEventsDemo extends Frame implements MouseListener, MouseMotionListener { String msg ; int mouseX 0, mouseY 0; // 鼠标坐标 public MouseEventsDemo() { addMouseListener(this); addMouseMotionListener(this); addWindowListener(new MyWindowAdapter()); } // 处理鼠标点击事件 public void mouseClicked(MouseEvent me) { msg msg -- click received; repaint(); } // 处理鼠标进入组件区域事件 public void mouseEntered(MouseEvent me) { mouseX 100; mouseY 100; msg Mouse entered.; repaint(); } // 处理鼠标离开组件区域事件 public void mouseExited(MouseEvent me) { mouseX 100; mouseY 100; msg Mouse exited.; repaint(); } // 处理鼠标按键按下事件 public void mousePressed(MouseEvent me) { // 保存坐标 mouseX me.getX(); mouseY me.getY(); msg Button down; repaint(); } // 处理鼠标按键释放事件 public void mouseReleased(MouseEvent me) { // 保存坐标 mouseX me.getX(); mouseY me.getY(); msg Button Released; repaint(); } // 处理鼠标拖动事件 public void mouseDragged(MouseEvent me) { // 保存坐标 mouseX me.getX(); mouseY me.getY(); msg * mouse at mouseX , mouseY; repaint(); } // 处理鼠标移动事件 public void mouseMoved(MouseEvent me) { msg Moving mouse at me.getX() , me.getY(); repaint(); } // 在窗口的当前 X,Y 位置显示消息 public void paint(Graphics g) { g.drawString(msg, mouseX, mouseY); } public static void main(String[] args) { MouseEventsDemo appwin new MouseEventsDemo(); appwin.setSize(new Dimension(300, 300)); appwin.setTitle(MouseEventDemo); appwin.setVisible(true); } } // 当点击框架中的关闭框时关闭窗口并退出程序。 class MyWindowAdapter extends WindowAdapter { public void windowClosing(WindowEvent we) { System.exit(0); } }执行命令javac MouseEventsDemo.java java MouseEventsDemo2. 程序清单 2:SimpleKey.java此程序演示了基本的键盘事件处理包括按键按下、释放和键入事件。// 保存为 SimpleKey.java import java.awt.*; import java.awt.event.*; public class SimpleKey extends Frame implements KeyListener { String msg ; String keyState ; public SimpleKey() { addKeyListener(this); addWindowListener(new MyWindowAdapter()); } // 处理按键按下事件 public void keyPressed(KeyEvent ke) { keyState Key Down; repaint(); } // 处理按键释放事件 public void keyReleased(KeyEvent ke) { keyState Key Up; repaint(); } // 处理键入字符事件 public void keyTyped(KeyEvent ke) { msg ke.getKeyChar(); repaint(); } // 显示按键信息 public void paint(Graphics g) { g.drawString(msg, 20, 100); g.drawString(keyState, 20, 50); } public static void main(String[] args) { SimpleKey appwin new SimpleKey(); appwin.setSize(new Dimension(200, 150)); appwin.setTitle(SimpleKey); appwin.setVisible(true); } } // 当点击框架中的关闭框时关闭窗口并退出程序。 class MyWindowAdapter extends WindowAdapter { public void windowClosing(WindowEvent we) { System.exit(0); } }执行命令javac SimpleKey.java java SimpleKey3. 程序清单 3:KeyEventsDemo.java此程序演示了如何识别特定的虚拟键码如功能键、方向键、翻页键。// 保存为 KeyEventsDemo.java import java.awt.*; import java.awt.event.*; public class KeyEventsDemo extends Frame implements KeyListener { String msg ; String keyState ; public KeyEventsDemo() { addKeyListener(this); addWindowListener(new MyWindowAdapter()); } // 处理按键按下事件 public void keyPressed(KeyEvent ke) { keyState Key Down; int key ke.getKeyCode(); switch(key) { case KeyEvent.VK_F1: msg F1; break; case KeyEvent.VK_F2: msg F2; break; case KeyEvent.VK_F3: msg F3; break; case KeyEvent.VK_PAGE_DOWN: msg PgDn; break; case KeyEvent.VK_PAGE_UP: msg PgUp; break; case KeyEvent.VK_LEFT: msg Left Arrow; break; case KeyEvent.VK_RIGHT: msg Right Arrow; break; } repaint(); } // 处理按键释放事件 public void keyReleased(KeyEvent ke) { keyState Key Up; repaint(); } // 处理键入字符事件 public void keyTyped(KeyEvent ke) { msg ke.getKeyChar(); repaint(); } // 显示按键信息 public void paint(Graphics g) { g.drawString(msg, 20, 100); g.drawString(keyState, 20, 50); } public static void main(String[] args) { KeyEventsDemo appwin new KeyEventsDemo(); appwin.setSize(new Dimension(200, 150)); appwin.setTitle(KeyEventsDemo); appwin.setVisible(true); } } // 当点击框架中的关闭框时关闭窗口并退出程序。 class MyWindowAdapter extends WindowAdapter { public void windowClosing(WindowEvent we) { System.exit(0); } }执行命令javac KeyEventsDemo.java java KeyEventsDemo4. 程序清单 4:AdapterDemo.java此程序演示了使用适配器类MouseAdapter来处理鼠标事件避免了实现接口中所有方法的繁琐。// 保存为 AdapterDemo.java import java.awt.*; import java.awt.event.*; public class AdapterDemo extends Frame { String msg ; public AdapterDemo() { addMouseListener(new MyMouseAdapter(this)); addMouseMotionListener(new MyMouseAdapter(this)); addWindowListener(new MyWindowAdapter()); } // 显示鼠标信息 public void paint(Graphics g) { g.drawString(msg, 20, 80); } public static void main(String[] args) { AdapterDemo appwin new AdapterDemo(); appwin.setSize(new Dimension(200, 150)); appwin.setTitle(AdapterDemo); appwin.setVisible(true); } } // 仅处理鼠标点击和拖动事件 class MyMouseAdapter extends MouseAdapter { AdapterDemo adapterDemo; public MyMouseAdapter(AdapterDemo adapterDemo) { this.adapterDemo adapterDemo; } // 处理鼠标点击事件 public void mouseClicked(MouseEvent me) { adapterDemo.msg Mouse clicked; adapterDemo.repaint(); } // 处理鼠标拖动事件 public void mouseDragged(MouseEvent me) { adapterDemo.msg Mouse dragged; adapterDemo.repaint(); } } // 当点击框架中的关闭框时关闭窗口并退出程序。 class MyWindowAdapter extends WindowAdapter { public void windowClosing(WindowEvent we) { System.exit(0); } }执行命令javac AdapterDemo.java java AdapterDemo5. 程序清单 5:MousePressedDemo.java此程序演示了使用外部适配器类处理鼠标按下事件。// 保存为 MousePressedDemo.java import java.awt.*; import java.awt.event.*; public class MousePressedDemo extends Frame { String msg ; public MousePressedDemo() { addMouseListener(new MyMouseAdapter(this)); addWindowListener(new MyWindowAdapter()); } public void paint(Graphics g) { g.drawString(msg, 20, 100); } public static void main(String[] args) { MousePressedDemo appwin new MousePressedDemo(); appwin.setSize(new Dimension(200, 150)); appwin.setTitle(MousePressedDemo); appwin.setVisible(true); } } class MyMouseAdapter extends MouseAdapter { MousePressedDemo mousePressedDemo; public MyMouseAdapter(MousePressedDemo mousePressedDemo) { this.mousePressedDemo mousePressedDemo; } // 处理鼠标按下事件 public void mousePressed(MouseEvent me) { mousePressedDemo.msg Mouse Pressed.; mousePressedDemo.repaint(); } } // 当点击框架中的关闭框时关闭窗口并退出程序。 class MyWindowAdapter extends WindowAdapter { public void windowClosing(WindowEvent we) { System.exit(0); } }执行命令javac MousePressedDemo.java java MousePressedDemo6. 程序清单 6:InnerClassDemo.java此程序演示了使用内部类来处理事件使代码结构更紧凑。// 保存为 InnerClassDemo.java import java.awt.*; import java.awt.event.*; public class InnerClassDemo extends Frame { String msg ; public InnerClassDemo() { addMouseListener(new MyMouseAdapter()); addWindowListener(new MyWindowAdapter()); } // 内部类处理鼠标按下事件 class MyMouseAdapter extends MouseAdapter { public void mousePressed(MouseEvent me) { msg Mouse Pressed.; repaint(); } } // 内部类处理窗口关闭事件 class MyWindowAdapter extends WindowAdapter { public void windowClosing(WindowEvent we) { System.exit(0); } } public void paint(Graphics g) { g.drawString(msg, 20, 80); } public static void main(String[] args) { InnerClassDemo appwin new InnerClassDemo(); appwin.setSize(new Dimension(200, 150)); appwin.setTitle(InnerClassDemo); appwin.setVisible(true); } }执行命令javac InnerClassDemo.java java InnerClassDemo7. 程序清单 7:AnonymousInnerClassDemo.java此程序演示了使用匿名内部类来处理事件这是最简洁的事件处理方式。// 保存为 AnonymousInnerClassDemo.java import java.awt.*; import java.awt.event.*; public class AnonymousInnerClassDemo extends Frame { String msg ; public AnonymousInnerClassDemo() { // 匿名内部类处理鼠标按下事件 addMouseListener(new MouseAdapter() { public void mousePressed(MouseEvent me) { msg Mouse Pressed.; repaint(); } }); // 匿名内部类处理窗口关闭事件 addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent we) { System.exit(0); } }); } public void paint(Graphics g) { g.drawString(msg, 20, 80); } public static void main(String[] args) { AnonymousInnerClassDemo appwin new AnonymousInnerClassDemo(); appwin.setSize(new Dimension(200, 150)); appwin.setTitle(AnonymousInnerClassDemo); appwin.setVisible(true); } }执行命令javac AnonymousInnerClassDemo.java java AnonymousInnerClassDemo程序功能与事件处理机制总结程序文件核心演示内容事件处理方式关键接口/类MouseEventsDemo鼠标所有事件点击、移动、拖动等主类实现MouseListener和MouseMotionListener接口MouseListener,MouseMotionListenerSimpleKey键盘基本事件按下、释放、键入主类实现KeyListener接口KeyListenerKeyEventsDemo识别特定虚拟键码如F1, 方向键主类实现KeyListener接口使用getKeyCode()KeyListener,KeyEvent.VK_*AdapterDemo使用适配器类处理鼠标事件使用外部MouseAdapter类MouseAdapterMousePressedDemo使用外部适配器类处理单一事件使用外部MouseAdapter类MouseAdapterInnerClassDemo使用内部类处理事件使用成员内部类内部类AnonymousInnerClassDemo使用匿名内部类处理事件使用匿名内部类匿名内部类通用执行步骤保存文件将每个listing的代码复制到对应的.java文件中例如MouseEventsDemo.java。编译在命令行中导航到文件所在目录运行javac 文件名.java。运行编译成功后运行java 类名注意类名不含.java后缀。注意事项这些是基于 AWT 的旧式 Java GUI 程序。运行前请确保已安装 Java开发工具包 (JDK)。程序窗口的关闭功能均通过WindowAdapter实现点击窗口关闭按钮可退出程序 。所有程序都遵循 AWT 的事件处理模型事件源如Frame注册事件监听器如MouseListener当事件发生时会调用监听器对应的回调方法如mouseClicked。参考来源Java——AWT详解Java图形用户界面设计AWT事件处理Java AWT 事件处理java事件处理入门深入浅出AWT事件监听器及其应用