【Java GUI编程】002-AWT学习笔记（二）：事件监听、输入框事件监听、画笔、鼠标监听、窗口监听、键盘监听

逃离我推掉我的手 2023-10-05 09:46 1阅读 0赞

# 一、事件监听 #

## 1、事件监听 ##

当某件事发生时，做些什么；

## 2、按钮点击监听 ##

### 代码演示： ###

package com.zibo.lession02;
    
    import java.awt.*;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    
    public class TestAction {
        public static void main(String[] args) {
            Frame frame = new Frame("TestAction");
            Button btn = new Button("btn");
            //因为addActionListener()需要ActionListener，所以我们写一个实现类
            MyActionListener myActionListener = new MyActionListener();
            btn.addActionListener(myActionListener);
            frame.add(btn,BorderLayout.CENTER);
            frame.setBounds(300,300,500,500);
            frame.setVisible(true);
        }
    }
    class MyActionListener implements ActionListener{
    
        @Override
        public void actionPerformed(ActionEvent e) {
            System.out.println("AAA");
        }
    }

### 运行结果： ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI5Njg5MzQz_size_16_color_FFFFFF_t_70][]

## 3、两个按钮共用一个监听事件 ##

### 代码演示： ###

package com.zibo.lession02;
    
    import java.awt.*;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    
    public class TestAction2 {
        public static void main(String[] args) {
            Frame frame = new Frame("TestAction2");
            Button start = new Button("start");
            Button stop = new Button("stop");
            //因为addActionListener()需要ActionListener，所以我们写一个实现类
            MyActionListener2 myActionListener = new MyActionListener2();
            start.addActionListener(myActionListener);
            stop.addActionListener(myActionListener);
            stop.setActionCommand("stop-go");
            frame.add(start,BorderLayout.EAST);
            frame.add(stop,BorderLayout.WEST);
            frame.setBounds(300,300,500,500);
            frame.setVisible(true);
        }
    }
    
    class MyActionListener2 implements ActionListener{
    
        @Override
        public void actionPerformed(ActionEvent e) {
            System.out.println("按钮被点击了，ActionCommand：" + e.getActionCommand());
        }
    }

### 运行结果： ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI5Njg5MzQz_size_16_color_FFFFFF_t_70 1][]

# 二、输入框事件监听 #

### 代码演示： ###

package com.zibo.lession02;
    
    import java.awt.*;
    
    public class TestTest01 {
        public static void main(String[] args) {
            new MyFrame();
        }
    }
    class MyFrame extends Frame{
        public MyFrame(){
            setBounds(300,300,500,500);
            TextField textField = new TextField();
            //密码输入
    //        textField.setEchoChar('*');
            textField.addActionListener(e -> {
                TextField field = (TextField)e.getSource();
                String text = field.getText();
                System.out.println(text);
            });
            add(textField);
            setVisible(true);
        }
    
    }

### 运行结果： ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI5Njg5MzQz_size_16_color_FFFFFF_t_70 2][]

# 三、简易计算器 #

### 代码演示： ###

package com.zibo.lession02;
    
    import java.awt.*;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    
    public class EasyCalculator {
        public static void main(String[] args) {
            new MyEasyCalculator();
        }
    }
    class MyEasyCalculator extends Frame{
        public MyEasyCalculator(){
            setBounds(500,500,400,80);
            setLayout(new FlowLayout());
            TextField field1 = new TextField(10);//10为字符数
            Label add = new Label("+");
            TextField field2 = new TextField(10);
            Label is = new Label("=");
            TextField field3 = new TextField(10);
            Button go = new Button("go");
            go.addActionListener(e -> {
                if(!"".equals(field1.getText()) && !"".equals(field2.getText())){
                    field3.setText(String.valueOf(Integer.parseInt(field1.getText()) + Integer.parseInt(field2.getText())));
                }
            });
            add(field1);
            add(add);
            add(field2);
            add(is);
            add(field3);
            add(go);
            setVisible(true);
        }
    }

### 运行结果： ###

![20200908090754447.gif][]

# 四、画笔paint #

### 代码演示： ###

package com.zibo.lession02;
    
    import java.awt.*;
    
    public class TestPaint {
        public static void main(String[] args) {
            new MyPaint().loadFrame();
        }
    }
    class MyPaint extends Frame {
        public void loadFrame(){
            setBounds(300,300,500,500);
            setVisible(true);
        }
        //画笔
    
        @Override
        public void paint(Graphics g) {
            //设置画笔颜色
            g.setColor(Color.RED);
            //画空心圆
    //        g.drawOval(50,50,100,100);
            //画实心圆
            g.fillOval(50,50,100,100);
            //画矩形
            g.fillRect(200,200,100,150);
        }
    }

### 运行结果： ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI5Njg5MzQz_size_16_color_FFFFFF_t_70 3][]

# 五、鼠标监听事件 #

### 代码演示： ###

package com.zibo.lession03;
    
    import java.awt.*;
    import java.awt.event.MouseAdapter;
    import java.awt.event.MouseEvent;
    import java.util.ArrayList;
    import java.util.Iterator;
    import java.util.List;
    
    public class TestMouseListener {
        public static void main(String[] args) {
            new MyFrame("TestMouseListener");
        }
    }
    class MyFrame extends Frame{
        List<Point> pointList = new ArrayList<>();
        public MyFrame(String title){
            setTitle(title);
            setBounds(300,300,500,500);
            setVisible(true);
    
            //鼠标监听事件
            addMouseListener(new MouseAdapter() {
                @Override
                public void mouseClicked(MouseEvent e) {
                    super.mouseClicked(e);
                    MyFrame myFrame = (MyFrame) e.getSource();
                    myFrame.addPaint(new Point(e.getX(),e.getY()));
                    //重置画笔
                    myFrame.repaint();
                }
            });
        }
    
        private void addPaint(Point point){
            pointList.add(point);
        }
    
        @Override
        public void paint(Graphics g) {
            super.paint(g);
            for (Point point : pointList) {
                g.setColor(Color.RED);
                g.fillOval(point.x, point.y, 10, 10);
            }
        }
    }

### 运行结果： ###

![2020090810583484.gif][]

# 六、窗口监听 #

### 代码演示： ###

package com.zibo.lession03;
    
    import java.awt.*;
    import java.awt.event.WindowAdapter;
    import java.awt.event.WindowEvent;
    
    public class TestWindowFrameListener {
        public static void main(String[] args) {
            new WindowFrame("TestWindowFrameListener");
        }
    }
    class WindowFrame extends Frame{
        public WindowFrame(String title) throws HeadlessException {
            setTitle(title);
            setBounds(300,300,500,500);
            setBackground(Color.CYAN);
            setVisible(true);
            addWindowListener(new WindowAdapter() {
                //常用4个
                @Override
                public void windowOpened(WindowEvent e) {
                    super.windowOpened(e);
                    System.out.println("窗口打开");
                }
    
                @Override
                public void windowClosing(WindowEvent e) {
                    super.windowClosing(e);
                    System.out.println("窗口关闭中（常用）");
                    setVisible(false);//隐藏
                    System.exit(0);//结束程序
                }
    
                @Override
                public void windowClosed(WindowEvent e) {
                    super.windowClosing(e);
                    System.out.println("窗口关闭后");
                }
    
                @Override
                public void windowActivated(WindowEvent e) {
                    super.windowActivated(e);
                    System.out.println("窗口激活（常用）");
                }
    
            });
        }
    }

### 运行结果： ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI5Njg5MzQz_size_16_color_FFFFFF_t_70 4][]

# 七、键盘监听 #

### 代码演示： ###

package com.zibo.lession03;
    
    import java.awt.*;
    import java.awt.event.KeyAdapter;
    import java.awt.event.KeyEvent;
    
    public class TestKeyListener {
        public static void main(String[] args) {
            new KeyFrame("TestKeyListener");
        }
    }
    class KeyFrame extends Frame{
        public KeyFrame(String title){
            setTitle(title);
            setBounds(300,300,500,500);
            setVisible(true);
    
            addKeyListener(new KeyAdapter() {
                @Override
                public void keyPressed(KeyEvent e) {
                    super.keyPressed(e);
                    if(e.getKeyCode() == KeyEvent.VK_Q){
                        System.out.println("你按了Q键！");
                        System.out.println(e.getKeyCode());
                    }
                }
            });
        }
    }

### 运行结果： ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI5Njg5MzQz_size_16_color_FFFFFF_t_70 5][]

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[20200908090754447.gif]: https://img-blog.csdnimg.cn/20200908090754447.gif
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[2020090810583484.gif]: https://img-blog.csdnimg.cn/2020090810583484.gif
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