[Java知识库]GUI编程 （狂神学习笔记）2021-10-8

GUI 编程

告诉大家该怎么学？

• 这是什么？
• 它怎么玩
• 该如何去在我们平时运用？
• class-可阅读的

组件

• 窗口
• 弹窗
• 面板
• 文本框
• 列表框
• 按钮
• 图片
• 监听时间
• 鼠标
• 键盘事件
• 外挂
• 破解工具

1、简介

Gui的核心技术: Swing AWT

1. 因为界面不美观
2. 需要jre环境

为什么我们要学习？

1. 可以写出自己心中想要的小工具
2. 工作时候，也可能需要维护到swing界面，概率极小！
3. 了解MVC架构，了解监听！

2、AWT

2.1 AWT介绍

1. 包含了很多类和接口！ GUI!
2. 元素：窗口，按钮，文本框
3. java.awt

2.2 组件和容器

1.2.1 Frame

package com.tree.lesson01;
import java.awt.*;
/**
 * GUI 的第一个界面
 */
public class TestFrame {
    public static void main(String[] args) {
        Frame frame = new Frame("我的java程序");

        //设置窗口大小
        frame.setSize(400,400);
        // 设置窗口位置
        frame.setLocation(200,200);
        //设置背景颜色
        frame.setBackground(Color.gray);
        //设置可见性
        frame.setVisible(true);
        //设置窗口拉伸
        frame.setResizable(false);
    }
}

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/**
 * 创建多个窗口
 */
public class TestFrame2 {
    public static void main(String[] args) {
        MyFrame myFrame1 = new MyFrame(100,100,200,200,Color.red);
        MyFrame myFrame2 = new MyFrame(300,100,200,200,Color.yellow);
        MyFrame myFrame3 = new MyFrame(100,300,200,200,Color.blue);
        MyFrame myFrame4 = new MyFrame(300,300,200,200,Color.green);
    }
}
class MyFrame extends Frame{
    static int id=0;
    public MyFrame(int x,int y,int w,int h,Color color){
        super("MyFrame"+(++id));可能存在多个窗口，我们需要一个计数器
        setBackground(color);
        setBounds(x,y,w,h);
        setVisible(true);
    }
}

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1.2.2. Panel（面板）

public class TestPanel {
    public static void main(String[] args) {
        Frame frame = new Frame();
        Panel panel = new Panel();
        //对窗口设置布局、可见性
        frame.setLayout(null);
        frame.setVisible(true);
        //窗口的坐标
        frame.setBounds(100,100,400,400);
        frame.setBackground(Color.red);
        //相对于frame的面板坐标
        panel.setBounds(50,50,300,300);
        panel.setBackground(Color.yellow);
        //将面板添加到窗口
        frame.add(panel);

        frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
}

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2.3 布局管理器

• 流式布局

public class TestFlowLayout {  //流式布局
    public static void main(String[] args) {
        Frame frame = new Frame();
        frame.setVisible(true);
        Button button1 = new Button("button1");
        Button button2 = new Button("button2");
        Button button3 = new Button("button3");
        Button button4 = new Button("button4");

        frame.setLayout(new FlowLayout(FlowLayout.LEFT));
        frame.setSize(300,200);

        frame.add(button1);
        frame.add(button2);
        frame.add(button3);
        frame.add(button4);
    }
}

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• 东西南北中

public class TestBorderLayout {
    public static void main(String[] args) {
        Frame frame = new Frame();
        frame.setVisible(true);
        Button east = new Button("east");
        Button west = new Button("west");
        Button south = new Button("south");
        Button north = new Button("north");
        Button center = new Button("center");

        frame.setSize(300,200);

        frame.add(east,BorderLayout.EAST);
        frame.add(west,BorderLayout.WEST);
        frame.add(south,BorderLayout.SOUTH);
        frame.add(north,BorderLayout.NORTH);
        frame.add(center,BorderLayout.CENTER);
    }
}

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• 表格布局

public class TestGridLayout {
    public static void main(String[] args) {
        Frame frame = new Frame();
        Button button1 = new Button("button1");
        Button button2 = new Button("button2");
        Button button3 = new Button("button3");
        Button button4 = new Button("button4");
        Button button5 = new Button("button5");
        Button button6 = new Button("button6");
        //设置表格布局 3*2
        frame.setLayout(new GridLayout(3,2));
        frame.add(button1);
        frame.add(button2);
        frame.add(button3);
        frame.add(button4);
        frame.add(button5);
        frame.add(button6);

        frame.setVisible(true);
        //将表格自动填充于窗口
        frame.pack();
    }
}

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课堂练习

/**
 * 坐标定位  布局法
 */
public class TestHomeWork {
    public static void main(String[] args) {
        Frame frame = new Frame();
        Button button1 = new Button("button1");
        Button button2 = new Button("button2");
        Button button3 = new Button("button3");
        Button button4 = new Button("button4");
        Button button5 = new Button("button5");
        Button button6 = new Button("button6");
        Button button7 = new Button("button7");
        Button button8 = new Button("button8");
        Button button9 = new Button("button9");
        Button button10 = new Button("button10");

        button1.setBounds(0,0,100,200);
        frame.add(button1);
        button2.setBounds(100,0,400,100);
        frame.add(button2);
        button3.setBounds(100,100,400,100);
        frame.add(button3);
        button4.setBounds(500,0,100,200);
        frame.add(button4);
        button5.setBounds(0,200,100,200);
        frame.add(button5);
        button6.setBounds(100,200,200,100);
        frame.add(button6);
        button7.setBounds(300,200,200,100);
        frame.add(button7);
        button8.setBounds(100,300,200,100);
        frame.add(button8);
        button9.setBounds(300,300,200,100);
        frame.add(button9);
        button10.setBounds(500,200,100,200);
        frame.add(button10);

        frame.setSize(600,400);
        frame.setVisible(true);
    }
}

/**
 * 面板布局法
 */
public class TestHomeWork02 {
    public static void main(String[] args) {
        Frame frame = new Frame();

        frame.setLayout(new GridLayout(2,1));
        Panel p1 = new Panel(new BorderLayout());
        Panel p2 = new Panel(new GridLayout(2,1));
        Panel p3 = new Panel(new BorderLayout());
        Panel p4 = new Panel(new GridLayout(2,2));

        p1.add(new Button("east-1"),BorderLayout.EAST);
        p1.add(new Button("west-1"),BorderLayout.WEST);
        p2.add(new Button("p2-btn-1"));
        p2.add(new Button("p2-btn-2"));
        p1.add(p2,BorderLayout.CENTER);

        p3.add(new Button("east-2"),BorderLayout.EAST);
        p3.add(new Button("west-2"),BorderLayout.WEST);
        for (int i = 0; i < 4; i++) {
            p4.add(new Button("p4-btn-"+i));
        }
        p3.add(p4,BorderLayout.CENTER);

        frame.add(p1);
        frame.add(p3);
        frame.setLocation(300,400);
        frame.setBackground(Color.black);
        frame.setSize(600,400);
        frame.setVisible(true);
    }
}

2.4 事件监听

事件监听：当某个事情发送的时候，干什么？

package com.tree.lesson02;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

/**
 * Created by Lo on 2021/9/8/008.
 */
public class TestActionEvent {
    public static void main(String[] args) {
        Frame frame = new Frame();
        Button button = new Button();
        MyActionListener myActionListener = new MyActionListener();
        button.addActionListener(myActionListener);

        frame.add(button);
        frame.pack();
        frame.setVisible(true);
    }
    private static void windowClose(Frame frame){
        frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
}
class MyActionListener implements ActionListener{

    public void actionPerformed(ActionEvent e) {
        System.out.println("aaa");
    }
}

2.5 输入框TextField

public class TestText01 {
    public static void main(String[] args) {
        new MyFrame();
    }
}
class MyFrame extends Frame{
    public MyFrame(){
        TextField textField = new TextField();
        add(textField);

        //监听这个文本框输入的文字
        MyActionListener2 myActionListener2 = new MyActionListener2();
        按下enter 就会触发这个输入框的事件
        textField.addActionListener(myActionListener2);

        //设置替换编码
        textField.setEchoChar('*');

        setVisible(true);
        pack();
    }
}
class MyActionListener2 implements ActionListener{
    public void actionPerformed(ActionEvent e) {
        TextField field = (TextField) e.getSource();//获得资源，返回一个对象
        System.out.println(field.getText());
        field.setText("");
    }
}

2.6 易计算器，组合+内部类回顾复习！

oop原则：组合，大于继承

class A extends B{
    
}//继承

class A{
    public B b 
} //组合      

目前代码

public class TestCalc {
    public static void main(String[] args) {
        new Calcultor();
    }
}
class Calcultor extends Frame{
    public Calcultor(){
        //三个文本框
        TextField num1 = new TextField(10);
        TextField num2 = new TextField(10);
        TextField num3 = new TextField(20);
        //一个按钮
        Button button = new Button("=");
        button.addActionListener(new MyCalcultorListener(num1,num2,num3));
        //一个标签
        Label label = new Label("+");
        setLayout(new FlowLayout());
        add(num1);
        add(label);
        add(num2);
        add(button);
        add(num3);
        setSize(600,100);
        setVisible(true);
    }
}
class MyCalcultorListener implements ActionListener{
    private TextField num1,num2,num3;

    public MyCalcultorListener(TextField num1,TextField num2,TextField num3){
        this.num1 = num1;
        this.num2 = num2;
        this.num3 = num3;
    }
    
    public void actionPerformed(ActionEvent e) {
        //1.获取加数和被加数
        int n1 = Integer.parseInt(num1.getText());
        int n2 = Integer.parseInt(num2.getText());
        //2.将这个值加法运算后，放到第三个数
        num3.setText(""+(n1+n2));
        //3.清除前两个框
        num1.setText("");
        num2.setText("");
    }
}

完全改造为面向对象写法

public class TestCalc {
    public static void main(String[] args) {
        new Calcultor().loadFrame();
    }
}
//GUI界面
class Calcultor extends Frame{
    //属性
    TextField num1,num2,num3;
    //方法
    public void loadFrame(){
        num1 = new TextField(10);
        num2 = new TextField(10);
        num3 = new TextField(20);
        Button button = new Button("=");
        Label label = new Label("+");

        button.addActionListener(new MyCalcultorListener(this));

        setLayout(new FlowLayout());
        add(num1);
        add(label);
        add(num2);
        add(button);
        add(num3);
        setSize(600,100);
        setVisible(true);
    }
}
//监听事件
class MyCalcultorListener implements ActionListener{
    Calcultor calcultor = null;

    public MyCalcultorListener(Calcultor calcultor){
        this.calcultor = calcultor;
    }

    public void actionPerformed(ActionEvent e) {
        //1.获取加数和被加数
        //2.将这个值加法运算后，放到第三个款
        //3.清除前两个框
        int n1 = Integer.parseInt(calcultor.num1.getText());
        int n2 = Integer.parseInt(calcultor.num2.getText());
        calcultor.num3.setText(""+(n1+n2));
        calcultor.num1.setText("");
        calcultor.num2.setText("");
    }
}

内部类

public class TestCalc {
    public static void main(String[] args) {
        new Calcultor().loadFrame();
    }
}
//GUI界面
class Calcultor extends Frame{
    //属性
    TextField num1,num2,num3;
    //方法
    public void loadFrame(){
        num1 = new TextField(10);
        num2 = new TextField(10);
        num3 = new TextField(20);
        Button button = new Button("=");
        Label label = new Label("+");

        button.addActionListener(new MyCalcultorListener());

        setLayout(new FlowLayout());
        add(num1);
        add(label);
        add(num2);
        add(button);
        add(num3);
        setSize(600,100);
        setVisible(true);
    }

    private class MyCalcultorListener implements ActionListener{
        //监听事件
        public void actionPerformed(ActionEvent e) {
            //1.获取加数和被加数
            //2.将这个值加法运算后，放到第三个款
            //3.清除前两个框
            int n1 = Integer.parseInt(num1.getText());
            int n2 = Integer.parseInt(num2.getText());
            num3.setText(""+(n1+n2));
            num1.setText("");
            num2.setText("");
        }
    }
}

2.7 画笔

public class TestPaint {
    public static void main(String[] args) {
        new MyPaint().loadPaint();
    }
}
class MyPaint extends Frame{
    public void loadPaint(){
        setBounds(200,200,600,500);
        setVisible(true);
    }
    @Override
    public void paint(Graphics g) {
        g.setColor(Color.red);
        g.drawOval(100,100,100,100);
        g.setColor(Color.green);
        g.fillRect(150,200,200,200);
    }
}

2.8 鼠标监听

目的：想要实现鼠标画画！

//鼠标监听事件
public class TestMouseListener {
    public static void main(String[] args) {
        new MyFrame("画图");
    }

}
class MyFrame extends Frame{
    ArrayList points;
    public MyFrame(String title) {
        // TODO Auto-generated constructor stub
        super(title);
        setBounds(200, 200, 400, 400);
        //存鼠标产生的点
        points=new ArrayList<>();
        this.addMouseListener(new MyMouseListener());
        setVisible(true);
    }
    public void paint(Graphics g) {
        //画画，监听鼠标事件
        Iterator iterator=points.iterator();
        while (iterator.hasNext()) {
            Point point=(Point)iterator.next();
            g.setColor(Color.cyan);
            g.fillOval(point.x, point.y, 10, 10);
        }
    }
    //添加一个点到界面上面
    public void addPaint(Point point) {
        points.add(point);
    }
    //适配器模式
    private class MyMouseListener extends MouseAdapter {
        //按下，弹起，按住不放
        public void mousePressed(MouseEvent e) {
            MyFrame myFrame=(MyFrame)e.getSource();
            //点击的时候，界面上产生一个点
            myFrame.addPaint(new Point(e.getX(),e.getY()));
            //没次点击鼠标都需要重画一遍
            myFrame.repaint();
        }
    }
}

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2.9 窗口监听

public class TestWindow {
    public static void main(String[] args) {
        new WindowFrame();
    }
}
class WindowFrame extends Frame{
    public WindowFrame() {
        setBackground(Color.red);
        setBounds(100,100,200,200);
        setVisible(true);
        addWindowListener(new MyWindowListener());
    }
    //内部类
    class MyWindowListener extends WindowAdapter{
        @Override
        public void windowClosing(WindowEvent e) {
            setVisible(false);
            System.out.println("窗口关闭");
        }
    }
}


public class TestWindow {
    public static void main(String[] args) {
        new WindowFrame();
    }
}
class WindowFrame extends Frame{
    public WindowFrame() {
        setBackground(Color.red);
        setBounds(100,100,200,200);
        setVisible(true);
        //匿名内部类
        this.addWindowListener(
                new WindowAdapter() {
                    @Override
                    public void windowClosing(WindowEvent e) {
                        System.out.println("窗口关闭");
                    }
                }
        );
    }
}

2.10 键盘监听

public class TestKeyboard {
    public static void main(String[] args) {
        new KeyboardFrame();
    }
}
class KeyboardFrame extends Frame{
    public KeyboardFrame(){
        setBackground(Color.red);
        setBounds(100,100,200,200);
        setVisible(true);
        this.addKeyListener(new KeyAdapter() {
            @Override
            public void keyPressed(KeyEvent e) {
                int keyCode = e.getKeyCode();
                if (keyCode==KeyEvent.VK_7);
                System.out.println("按了‘7’");
            }
        });
    }
}

总结：

1. Frame是一个顶级窗口
2. Panel无法单独显示，必须添加到某个容器中。
3. 布局管理器
   1. 流式
   2. 东西南北中
   3. 表格
4. 大小，定位，背景颜色，可见性，监听！

3、Swing

3.1 窗口，画板

public class JFrameDemo {

    //int(); 初始化
    public  void init(){
        JFrame jf = new JFrame("这是一个JFrame 窗口");
        jf.setVisible(true);
        jf.setBounds(100,100,200,200);
        jf.setBackground(Color.cyan);
        //设置文字 Jlabel
        JLabel label = new JLabel("阿巴阿巴阿巴",SwingConstants.CENTER);
        
        jf.add(label);
        
        //关闭事件
        jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    }
    public static void main(String[] args) {
        //建立一个窗口
        new JFrameDemo().init();
    }
}

标签居中

public class JframeDemo02 {
    public static void main(String[] args) {
        new MyJframe2().inti();
    }
}

class MyJframe2 extends JFrame{
    public void inti(){
        this.setVisible(true);
        this.setBounds(10,10,200,200);
        JLabel label = new JLabel("阿巴阿巴阿巴",SwingConstants.CENTER);

        //让文本标签居中，设置水平对齐
        //label.setHorizontalAlignment(SwingConstants.CENTER);
        //关闭事件

        this.add(label);
        //获得一个容器
        Container container = this.getContentPane();
        container.setBackground(Color.BLUE);
    }
}

3.2 弹窗

JDialog,用来被弹出，默认就有关闭事件

public class DialogDemo extends JFrame {
    public DialogDemo(){//构造器
        this.setBounds(100,100,200,200);
        this.setBackground(Color.gray);
        this.setVisible(true);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        //创建容器
        Container contentPane = this.getContentPane();
        //绝对布局
        contentPane.setLayout(null);

        //创建按钮
        JButton jButton = new JButton("弹出窗口");
        jButton.setBounds(30,30,100,100);
        contentPane.add(jButton);//容器里面加入按钮
        //点击这个按钮的时候，弹出一个弹窗, 这里就需要一个监听器去赋予按钮这个功能
        jButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                new MyDialogFrame();
            }
        });
    }
    public static void main(String[] args) {
        new DialogDemo();
    }
}
class MyDialogFrame extends JDialog{
    public MyDialogFrame() {
        this.setBounds(100,100,300,300);
        this.setVisible(true);
        //this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);// 里面自带了，所以这个是多余的

        Container contentPane = this.getContentPane();
        contentPane.setLayout(null);
        JLabel jLabel = new JLabel("欢迎cvbnm,");
        jLabel.setBounds(50,50,100,100);
        contentPane.add(jLabel);
    }
}

3.3 标签

图标 ICON

//图标，需要实现类，Frame 继承
public class IconDemo extends JFrame implements Icon {
    private  int width;
    private int height;

    public IconDemo(){}//无参构造

    public IconDemo(int width, int height){
        this.width = width;
        this.height = height;
    }

    public void init(){
        this.setBounds(100,100,700,500);
        IconDemo iconDemo = new IconDemo(15, 15);
        //图标放在标签上，也可以放在按钮上！
        JLabel label = new JLabel("icontest", iconDemo, SwingConstants.CENTER);

        Container container = getContentPane();
        container.add(label);

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

    public static void main(String[] args) {
        new IconDemo().init();

    }

    public void paintIcon(Component c, Graphics g, int x, int y){
        g.fillOval(x,y,width,height);
    }

    public int getIconWidth(){
        return this.width;
    }

    public int getIconHeight(){
        return this.height;
    }
}

图片ICON

public class ImageIconDemo extends JFrame{
    public ImageIconDemo(){
        JLabel jLabel = new JLabel("ImageIcon");
        URL url = ImageIconDemo.class.getResource("security.png");

        ImageIcon imageIcon = new ImageIcon(url);
        jLabel.setIcon(imageIcon);
        jLabel.setHorizontalAlignment(SwingConstants.CENTER);

        Container container = getContentPane();
        container.add(jLabel);

        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setBounds(100,100,200,200);
    }
    public static void main(String[] args) {
        new ImageIconDemo();
    }
}

3.4 面板

JPanel

public class JPanelDemo extends JFrame{
    public JPanelDemo() {
        Container container = this.getContentPane();
        container.setLayout(new GridLayout(2,1,10,10));
        JPanel p1 = new JPanel(new GridLayout(1, 3));

        p1.add(new JButton("1"));
        p1.add(new JButton("1"));
        p1.add(new JButton("1"));
        
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        this.setVisible(true);
        this.setBounds(100,100,200,200);
    }
    public static void main(String[] args) {
        new JPanelDemo();
    }
}

JScrollPanel

public class JPanelScroll extends JFrame {
    public JPanelScroll() {
        Container container = this.getContentPane();

        JTextArea jTextArea = new JTextArea(20,50);
        jTextArea.setText("这就是王者");
        JScrollPane jScrollPane = new JScrollPane(jTextArea);
        container.add(jScrollPane);

        this.setVisible(true);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        this.setBounds(100,100,200,200);
    }

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

3.5 按钮

• 图片按钮

public class JButtonDemo01 extends JFrame {

    public JButtonDemo01() {
        Container container = this.getContentPane();
        //将一个图片变为图标
        URL url = ImageIconDemo.class.getResource("timg.jpg");

        ImageIcon imageIcon = new ImageIcon(url);

        //把这个图标放在按钮上
        JButton button = new JButton();
        button.setIcon(imageIcon);
        button.setToolTipText("图片按钮");

        //add
        container.add(button);
        
        this.setVisible(true);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        this.setBounds(100,100,500,300);
    }

    public static void main(String[] args) {
        new JButtonDemo01();
    }
}

• 单项按钮

public class JButtonDemo02 extends JFrame {
    public JButtonDemo02(){
        Container container = this.getContentPane();

        //将一个图片变为图标
        URL url = ImageIconDemo.class.getResource("timg.jpg");
        ImageIcon imageIcon = new ImageIcon(url);

        //单选框
        JRadioButton radioButton1 = new JRadioButton("JRadioButton01");
        JRadioButton radioButton2 = new JRadioButton("JRadioButton02");
        JRadioButton radioButton3 = new JRadioButton("JRadioButton03");

        //由于单选框只能选择一个，所以需要分组，一个组中只能选择一个
        ButtonGroup group = new ButtonGroup();
        group.add(radioButton1);
        group.add(radioButton2);
        group.add(radioButton3);//如果不加入这个，那就都可以选择了

        container.add(radioButton1,BorderLayout.CENTER);
        container.add(radioButton2,BorderLayout.NORTH);
        container.add(radioButton3,BorderLayout.SOUTH);

        this.setVisible(true);
        this.setBounds(100,100,500,300);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }
    public static void main(String[] args) {
        new JButtonDemo02();
    }
}

• 复选按钮

public class JButtonDemo extends JFrame {
    public JButtonDemo() {
        Container container = this.getContenPance();
        /*
        // 放图片
        * Icon icon = new ImageIcon(resource);  
        * */
        //多选框
        JCheckBox c1 = new JCheckBox("01");
        JCheckBox c2 = new JCheckBox("02");
        JCheckBox c3 = new JCheckBox("03");
        container.add(c1, BorderLayout.CENTER);
        container.add(c2, BorderLayout.NORTH);
        container.add(c3, BorderLayout.SOUTH);
        this.setVisible(true);
        this.setSize(500, 300);
        this.setDeafaultCloseOpeartion(WindowConstants.EXIT_ON_CLOSE);
    }

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

3.6 列表

• 下拉框

public class TestComboboxDemo01 extends JFrame {
    public TestComboboxDemo01(){
        Container container = this.getContentPane();

        //下拉框
        JComboBox status = new JComboBox();

        status.addItem(null);
        status.addItem("正在上映");
        status.addItem("已下架");
        status.addItem("即将上映");

        container.add(status);

        this.setVisible(true);
        this.setBounds(100,100,500,350);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
        new TestComboboxDemo01();
    }
}

• 列表框

public class TestComboboxDemo02 extends JFrame {
    public TestComboboxDemo02(){

        Container container = this.getContentPane();

        //生成列表的内容 稀疏数组，压缩数据
        //String[] contents = {"1","2","3"};//静态

        Vector<Object> contents = new Vector();//也可以放动态的变量
        //列表中需要放入内容
        JList jList = new JList(contents);

        contents.add("张三");
        contents.add("list");
        contents.add("wangwu");
        
        container.add(jList);

        this.setVisible(true);
        this.setSize(500,350);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
        new TestComboboxDemo02();
    }
}

应用场景

• 选择地区，或者一些单个选项
• 列表，展示信息；一般是动态扩容

3.7 文本框

• 文本框

public class TestTextDemo01 extends JFrame {
    public TestTextDemo01(){

        Container container = this.getContentPane();

        JTextField textField = new JTextField("hello");
        JTextField textField2 = new JTextField("world",20);

        container.add(textField,BorderLayout.NORTH);
        container.add(textField2,BorderLayout.SOUTH);

        this.setVisible(true);
        this.setSize(500,350);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }
    public static void main(String[] args) {
        new TestTextDemo01();
    }
}

• 密码框

public class TestTextDemo02 extends JFrame {
    public TestTextDemo02(){
        Container container = this.getContentPane();

        // 面板

        JPasswordField passwordField = new JPasswordField(); // ****
        passwordField.setEchoChar('*');

        container.add(passwordField);

        this.setVisible(true);
        this.setSize(500,350);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }
    public static void main(String[] args) {
        new TestTextDemo02();
    }
}

• 文本域

public class TestTextDemo03 extends JFrame {
    public TestTextDemo03(){
        Container container = this.getContentPane();

        //文本域
        JTextArea textArea = new JTextArea(20,50);
        textArea.setText("阿巴阿巴阿巴");

        //Scroll面板
        JScrollPane scrollPane = new JScrollPane(textArea);
        container.add(scrollPane);

        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        this.setVisible(true);
        this.setSize(400,350);
    }

    public static void main(String[] args) {
        new TestTextDemo03();
    }
}

4、贪吃蛇

帧，如果时间片足够小，就是动画，一秒30帧 60帧。连起来是动画，拆开就是静态的图片！

监听监听

定时器 Timer

1. 定义数据

2. 画上去

3. 监听事件

   键盘

   事件

package snake;
import javax.swing.*;
//游戏的主启动类
public class StartGame {
    public static void main(String[] args) {
        JFrame frame = new JFrame();

        frame.setBounds(10,10,900,720);
        frame.setResizable(false);//窗口大小不可变
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        //正常游戏界面都应该在面上！
        frame.add(new GamePanel());
        frame.setVisible(true);
    }
}