• GUI编程入门

    GUI编程

    1.简介

    Gui的核心技术：Swing,AWT

    URL：统一资源管理器

    2.AWT

    2.1.Awt介绍

    抽象的窗口工具

    1.包含了很多类和接口

    2.元素：窗口，按钮，文本框

    3.java.awt

    2.2.组件和容器

    2.1.frame

    2.2.面板Panel

    3.布局管理器

    2.3流式布局

    1. package com.qyx.www.lesson01;
    2. ​
    3. import java.awt.*;
    4. ​
    5. public class TestFlowLayout {
    6.     public static void main(String[] args) {
    7.         Frame frame = new Frame();
    8. ​
    9.         //组件-按钮
    10.         Button button1 = new Button("button1");
    11.         Button button2 = new Button("button2");
    12.         Button button3 = new Button("button3");
    13. ​
    14.         //设置为流式布局
    15.         //frame.setLayout(new FlowLayout());
    16.         // frame.setLayout(new FlowLayout(FlowLayout.LEFT));
    17.         frame.setLayout(new FlowLayout(FlowLayout.RIGHT));
    18. ​
    19.         frame.setSize(200,200);
    20. ​
    21.         //把按钮添加上去
    22.         frame.add(button1);
    23.         frame.add(button2);
    24.         frame.add(button3);
    25. ​
    26.         frame.setVisible(true);
    27.     }
    28. }

    2.4东西南北中

    1. package com.qyx.www.lesson01;
    2. ​
    3. import java.awt.*;
    4. ​
    5. public class TestBorderLayout {
    6.     public static void main(String[] args) {
    7.         Frame frame = new Frame("TestBordLayout");
    8. ​
    9.         Button east = new Button("East");
    10.         Button west = new Button("West");
    11.         Button south = new Button("South");
    12.         Button north = new Button("North");
    13.         Button center = new Button("Center");
    14. ​
    15.         frame.add(east,BorderLayout.EAST);
    16.         frame.add(west,BorderLayout.WEST);
    17.         frame.add(south,BorderLayout.SOUTH);
    18.         frame.add(north,BorderLayout.NORTH);
    19.         frame.add(center,BorderLayout.CENTER);
    20. ​
    21.         frame.setSize(200,200);
    22.         frame.setVisible(true);
    23.     }
    24. }

    2.3.表格布局

    1. package com.qyx.www.lesson01;
    2. ​
    3. import java.awt.*;
    4. ​
    5. public class TestGridLayout {
    6.     public static void main(String[] args) {
    7.         Frame frame = new Frame("TestGridLayout");
    8. ​
    9.         Button btn1 = new Button("btn1");
    10.         Button btn2 = new Button("btn2");
    11.         Button btn3 = new Button("btn3");
    12.         Button btn4 = new Button("btn4");
    13.         Button btn5 = new Button("btn5");
    14.         Button btn6 = new Button("btn6");
    15. ​
    16.         frame.setLayout(new GridLayout(3,2));
    17. ​
    18.         frame.add(btn1);
    19.         frame.add(btn2);
    20.         frame.add(btn3);
    21.         frame.add(btn4);
    22.         frame.add(btn5);
    23.         frame.add(btn6);
    24. ​
    25.         frame.pack();//java函数
    26.         frame.setVisible(true);
    27.     }
    28. }

    3.1作业题：

    1. package com.qyx.www.lesson01;
    2. ​
    3. import java.awt.*;
    4. ​
    5. public class TestButton {
    6.     public static void main(String[] args) {
    7.         Frame frame = new Frame();
    8.         frame.setSize(400,300);
    9.         frame.setLocation(300,400);
    10.         frame.setBackground(Color.BLACK);
    11.         frame.setVisible(true);
    12.         frame.setLayout(new GridLayout(2,1));
    13. ​
    14.         //4个面板
    15.         Panel p1 = new Panel(new BorderLayout());
    16.         Panel p2 = new Panel(new GridLayout(2, 1));
    17.         Panel p3 = new Panel(new BorderLayout());
    18.         Panel p4 = new Panel(new GridLayout(2, 2));
    19. ​
    20.         //上面OK
    21.         p1.add(new Button("East-1"),BorderLayout.EAST);
    22.         p1.add(new Button("West-1"),BorderLayout.WEST);
    23.         p2.add(new Button("p2-btn-1"));
    24.         p2.add(new Button("p2-btn-2"));
    25.         p1.add(p2,BorderLayout.CENTER);
    26. ​
    27.         //下面
    28.         p3.add(new Button("East-2"),BorderLayout.EAST);
    29.         p3.add(new Button("West-2"),BorderLayout.WEST);
    30.         //中间四个
    31.         for (int i = 0; i < 4; i++) {
    32.             p4.add(new Button("for-"+i));
    33.         }
    34.         p3.add(p4,BorderLayout.CENTER);
    35. ​
    36.         frame.add(p1);
    37.         frame.add(p3);
    38. ​
    39. ​
    40.     }
    41. }

    3.2.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！

    2.4.事件监听

    事件监听：当某个事情发生的时候，干什么？

    1. package com.qyx.www.lesson02;
    2. ​
    3. import java.awt.*;
    4. import java.awt.event.ActionEvent;
    5. import java.awt.event.ActionListener;
    6. import java.awt.event.WindowAdapter;
    7. import java.awt.event.WindowEvent;
    8. ​
    9. public class TestActionEvent {
    10.     public static void main(String[] args) {
    11.         //按下按钮，触发一些事件
    12.         Frame frame = new Frame();
    13.         Button button = new Button();
    14.         //因为：addActionListener()需要一个ActionListener,所以我们需要构造一个ActionListener
    15.         MyActionListener myActionListener = new MyActionListener();
    16.         button.addActionListener(myActionListener);
    17. ​
    18.         frame.add(button,BorderLayout.CENTER);
    19.         frame.pack();
    20. ​
    21.         windowClose(frame); //关闭窗口
    22.         frame.setVisible(true);
    23.     }
    24. ​
    25.     //关闭窗口的事件
    26.     private static void windowClose(Frame frame){
    27.         frame.addWindowListener(new WindowAdapter() {
    28.             @Override
    29.             public void windowClosing(WindowEvent e) {
    30.                 System.exit(0);
    31.             }
    32.         });
    33.     }
    34. }
    35. ​
    36. //事件监听
    37. class MyActionListener implements ActionListener{
    38.     @Override
    39.     public void actionPerformed(ActionEvent e) {
    40.         System.out.println("666");
    41.     }
    42. }

    多个按钮，共享一个事件

    1. package com.qyx.www.lesson02;
    2. ​
    3. import java.awt.*;
    4. import java.awt.event.ActionEvent;
    5. import java.awt.event.ActionListener;
    6. ​
    7. public class TestActionTwo {
    8.     public static void main(String[] args) {
    9.         //两个按钮 实现同一个监听
    10.         //开始 停止
    11.         Frame frame = new Frame("开始-停止");
    12.         Button button1 = new Button("start");
    13.         Button button2 = new Button("stop");
    14. ​
    15.         //可以显示的定义出发会返回的命令，如果不显示定义，则会走默认的值
    16.         //可以多个按钮只写一个监听类
    17.         button2.setActionCommand("button2-stop");
    18. ​
    19.         MyMonitor myMonitor = new MyMonitor();
    20. ​
    21.         button1.addActionListener(myMonitor);
    22.         button2.addActionListener(myMonitor);
    23. ​
    24.         frame.add(button1,BorderLayout.NORTH);
    25.         frame.add(button2,BorderLayout.SOUTH);
    26. ​
    27.         frame.pack();
    28.         frame.setVisible(true);
    29.     }
    30. }
    31. ​
    32. class MyMonitor implements ActionListener{
    33. ​
    34.     @Override
    35.     public void actionPerformed(ActionEvent e) {
    36.         //e.getActioncommand()获得按钮的信息
    37.         System.out.println("按钮被点击了： msg=>"+e.getActionCommand());
    38.         if (e.getActionCommand().equals("start")){
    39. ​
    40.         }
    41. ​
    42.     }
    43. }

    2.5.输入框.testfield监听

    1. package com.qyx.www.lesson02;
    2. ​
    3. import java.awt.*;
    4. import java.awt.event.ActionEvent;
    5. import java.awt.event.ActionListener;
    6. ​
    7. public class TestText01 {
    8.     public static void main(String[] args) {
    9.         //启动！
    10.         new Myframe();
    11.     }
    12. }
    13. ​
    14. class Myframe extends Frame{
    15.     public Myframe(){
    16.         TextField textField = new TextField();
    17.         add(textField);
    18. ​
    19.         //监听这个文本框输入的文字
    20.         MyActionListener2 myActionListener2 = new MyActionListener2();
    21.         textField.addActionListener(myActionListener2);
    22. ​
    23.         //设置替换编码
    24.         textField.setEchoChar('*');
    25. ​
    26.         setVisible(true);
    27.         pack();
    28.     }
    29. }
    30. ​
    31. class MyActionListener2 implements ActionListener{
    32. ​
    33.     @Override
    34.     public void actionPerformed(ActionEvent e) {
    35.        TextField field =(TextField) e.getSource();//获得一些资源,返回的一个对象
    36.         System.out.println(field.getText());
    37.         field.setText("");//null
    38.     }
    39. }

    2.6.简易计算器，组合+内部类回顾复习

    OOP原则：组合，大于继承！

    1. package com.qyx.www.lesson02;
    2. ​
    3. import java.awt.*;
    4. import java.awt.event.ActionEvent;
    5. import java.awt.event.ActionListener;
    6. ​
    7. public class TestCalc {
    8.     public static void main(String[] args) {
    9.          new Calculator();
    10.     }
    11. }
    12. ​
    13. //计算器类
    14. class  Calculator extends Frame{
    15.     public Calculator(){
    16.        //3个文本框
    17.         TextField num1 = new TextField(10);//字符数
    18.         TextField num2 = new TextField(10);//字符数
    19.         TextField num3 = new TextField(20);//字符数
    20. ​
    21.         //1个按钮
    22.         Button button = new Button("=");
    23.         button.addActionListener(new MyCalculatorListener(num1,num2,num3));
    24. ​
    25.         //1个标签
    26.         Label label = new Label("+");
    27. ​
    28.         //布局
    29.         setLayout(new FlowLayout());
    30. ​
    31.         add(num1);
    32.         add(label);
    33.         add(num2);
    34.         add(button);
    35.         add(num3);
    36. ​
    37.         pack();
    38.         setVisible(true);
    39. ​
    40.     }
    41. }
    42. ​
    43. //监听器类
    44. class MyCalculatorListener implements ActionListener{
    45. ​
    46.     //获取三个变量
    47.     private TextField num1,num2,num3;
    48. ​
    49.     public MyCalculatorListener(TextField num1,TextField num2,TextField num3){
    50.         this.num1 = num1;
    51.         this.num2 = num2;
    52.         this.num3 = num3;
    53. ​
    54.     }
    55. ​
    56.     @Override
    57.     public void actionPerformed(ActionEvent e) {
    58. ​
    59.         //1.获得加数和被加数
    60.         int n1 = Integer.parseInt(num1.getText());
    61.         int n2 = Integer.parseInt(num2.getText());
    62. ​
    63.         //2.将这个值 + 法运算后，放到第三个框
    64.         num3.setText(""+(n1+n2));
    65. ​
    66.         //3.清除前两个框
    67.         num1.setText("");
    68.         num2.setText("");
    69.     }
    70. }

    2.7.画笔

    1. package com.qyx.www.lesson03;
    2.  
    3. import java.awt.*;
    4.  
    5. public class TestPaint {
    6.     public static void main(String[] args) {
    7.                new MyPaint().loadFrame();
    8.     }
    9. }
    10.  
    11. class MyPaint extends Frame{
    12.  
    13.     public void loadFrame(){
    14.         setBounds(200,200,600,500);
    15.         setVisible(true);
    16.     }
    17.     //画笔
    18.     @Override
    19.     public void paint(Graphics g){
    20.     //super.paint(g);
    21.         //画笔需要又颜色，画笔可以画画
    22.        //g.setColor(Color.red);
    23.         //g.drawOval(100,100,100,100);
    24.         g.fillOval(100,100,100,100);//实心的圆
    25.  
    26.         //g.setColor(Color.GREEN);
    27.         g.fillRect(150,200,150,200);
    28.  
    29.         //养成习惯，画笔用完，将他还原到最初的颜色
    30.     }
    31. }

    2.8.鼠标监听

    目的：想要实现鼠标画画

    1. package com.qyx.www.lesson03;
    2.  
    3. import java.awt.*;
    4. import java.awt.event.MouseAdapter;
    5. import java.awt.event.MouseEvent;
    6. import java.util.ArrayList;
    7. import java.util.Iterator;
    8.  
    9. public class TestMouseListener {
    10.     //鼠标监听事件
    11.     public static void main(String[] args) {
    12.         new MyFrame("画图");
    13.  
    14.     }
    15. }
    16.  
    17. //自己的类
    18. class MyFrame extends Frame{
    19.     //画画需要画笔，需要监听鼠标当前的位置，需要集合来存储这个点
    20.     ArrayList points;
    21.  
    22.     public MyFrame(String title) {
    23.         super(title);
    24.         setBounds(200,200,400,300);
    25.            //存鼠标的点击的点
    26.         points = new ArrayList<>();
    27.  
    28.         setVisible(true);
    29.         //鼠标监听器，正对这个窗口
    30.         this.addMouseListener(new MyMouseListener());
    31.     }
    32.  
    33.     @Override
    34.     public  void paint(Graphics g){
    35.         //画画，监听鼠标的事件
    36.         Iterator iterator = points.iterator();
    37.         while (iterator.hasNext()){
    38.             Point point =(Point) iterator.next();
    39.             g.setColor(Color.BLUE);
    40.             g.fillOval(point.x,point.y,10,10);
    41.         }
    42.     }
    43.  
    44.     //添加一个点到界面上
    45.     public void addPaint(Point point){
    46.         points.add(point);
    47.     }
    48.  
    49.     //适配器模式
    50.     private class MyMouseListener extends MouseAdapter{
    51.         //鼠标 按下，弹起，按住不放
    52.         @Override
    53.         public void mousePressed(MouseEvent e){
    54.             MyFrame myFrame =(MyFrame) e.getSource();
    55.             //这个我们点击的时候，就会再界面上产生一个点：画
    56.             //这个点就说鼠标的点;
    57.             myFrame.addPaint(new Point(e.getX(),e.getY()));
    58.  
    59.             //每次点击鼠标都需要重新画一遍
    60.             myFrame.repaint();//刷新 30帧 60帧
    61.  
    62.         }
    63.     }
    64. }

    2.9.窗口监听

    1. package com.qyx.www.lesson03;
    2.  
    3. import java.awt.*;
    4. import java.awt.event.WindowAdapter;
    5. import java.awt.event.WindowEvent;
    6.  
    7. public class TestWindow {
    8.     public static void main(String[] args) {
    9.         new WindowsFrame();
    10.     }
    11. }
    12.  
    13. class WindowsFrame extends Frame{
    14.     public WindowsFrame(){
    15.         setBackground(Color.blue);
    16.         setBounds(100,100,200,200);
    17.         setVisible(true);
    18.         //addWindowListener(new MyWindowListener());
    19.  
    20.         this.addWindowListener(
    21.                 //匿名内部类
    22.                 new WindowAdapter() {
    23.                     //关闭窗口
    24.                     @Override
    25.                     public void windowClosing(WindowEvent e) {
    26.                         System.out.println("windowClosing");
    27.                         System.exit(0);
    28.                     }
    29.                     //激活窗口
    30.                     @Override
    31.                     public void windowActivated(WindowEvent e) {
    32.                         WindowsFrame source = (WindowsFrame)e.getSource();
    33.                         source.setTitle("被激活了");
    34.                         System.out.println("windowActivated");
    35.                     }
    36.                 }
    37.         );
    38.     }
    39.  
    40.  
    41. }

    2.10.键盘监听

    1. package com.qyx.www.lesson03;
    2.  
    3. import java.awt.*;
    4. import java.awt.event.KeyAdapter;
    5. import java.awt.event.KeyEvent;
    6.  
    7. public class TestKeyListener {
    8.     public static void main(String[] args) {
    9.         new KeyFrame();
    10.     }
    11. }
    12.  
    13. class KeyFrame extends Frame{
    14.     public KeyFrame(){
    15.         setBounds(1,2,300,400);
    16.         setVisible(true);
    17.  
    18.         this.addKeyListener(new KeyAdapter() {
    19.             @Override
    20.             public void keyPressed(KeyEvent e) {
    21.                //获得键盘下的键是哪一个，当前的码
    22.                 int keyCode = e.getKeyCode();
    23.                 System.out.println(keyCode);
    24.                 if (keyCode == KeyEvent.VK_UP){
    25.                     System.out.println("你按下了上键");
    26.                 }
    27.             }
    28.         });
    29.  
    30.     }
    31. }

    3.Swing

    3.1.窗口。面板

    1. package com.qyx.www.lesson04;
    2.  
    3. import javax.swing.*;
    4. import java.awt.*;
    5.  
    6. public class JFrameDemo {
    7.     public static void main(String[] args) {
    8.         new MyJframe2().init();
    9.     }
    10. }
    11.  
    12. class MyJframe2 extends JFrame{
    13.     public void init(){
    14.         this.setBounds(10,10,200,300);
    15.         this.setVisible(true);
    16.  
    17.         JLabel label = new JLabel("欢迎来到我的世界！");
    18.         this.add(label);
    19.  
    20.         //让文本标签居中  设置水平对齐
    21.         label.setHorizontalAlignment(SwingConstants.CENTER);
    22.  
    23.         //获得一个容器
    24.         Container container = this.getContentPane();
    25.         container.setBackground(Color.YELLOW);
    26.     }
    27. }

    3.2弹窗

    JDialog，用来被弹出，默认就有关闭事件

    1. package com.qyx.www.lesson04;
    2.  
    3. import javax.swing.*;
    4. import java.awt.*;
    5. import java.awt.event.ActionEvent;
    6. import java.awt.event.ActionListener;
    7.  
    8.     //主窗口
    9.     public class DialogDemo extends JFrame{
    10.  
    11.         public DialogDemo(){
    12.             this.setVisible(true);
    13.             this.setSize(700,500);
    14.             this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    15.  
    16.             //JFrame 放东西，容器
    17.             Container container = this.getContentPane();
    18.             //绝对布局
    19.             container.setLayout(null);
    20.  
    21.             //按钮
    22.             JButton button = new JButton("点击弹出一个对话框"); //创建
    23.             button.setBounds(30,30,200,50);
    24.  
    25.             //点击这个按钮的时候，弹出一个弹窗
    26.             button.addActionListener(new ActionListener() {
    27.                 @Override
    28.                 public void actionPerformed(ActionEvent e) {
    29.                     //弹窗
    30.                     new MyDialogDemo();
    31.                 }
    32.             });
    33.  
    34.             container.add(button);
    35.         }
    36.  
    37.         public static void main(String[] args) {
    38.             new DialogDemo();
    39.         }
    40.     }
    41.  
    42.     //弹窗的窗口
    43.     class MyDialogDemo extends JDialog{
    44.         public MyDialogDemo(){
    45.             this.setVisible(true);
    46.             this.setBounds(100,100,500,500);
    47.  
    48.             Container container = this.getContentPane();
    49.             container.setLayout(null);
    50.  
    51.             container.add(new Label("老师带你学java"));
    52.         }
    53.     }

    3.3标签

    label

    new JLabel("xxx");

    图标ICON

    1. package com.qyx.www.lesson04;
    2.  
    3. import javax.swing.*;
    4. import java.awt.*;
    5.  
    6. //图标，需要实现类，Frame继承
    7. public class IconDemo extends JFrame implements Icon {
    8.  
    9.     private int width;
    10.     private int height;
    11.  
    12.     public IconDemo(){} //无参构造
    13.  
    14.            public IconDemo(int width,int height){
    15.         this.width=width;
    16.         this.height=height;
    17.            }
    18.  
    19.            public void init(){
    20.                IconDemo iconDemo = new IconDemo(15, 15);
    21.                //图标放在标签，也可以放在按钮上1
    22.                JLabel label = new JLabel("icontest", iconDemo, SwingConstants.CENTER);
    23.  
    24.                Container container = getContentPane();
    25.                container.add(label);
    26.  
    27.                this.setVisible(true);
    28.                this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    29.            }
    30.  
    31.     public static void main(String[] args) {
    32.         new IconDemo().init();
    33.     }
    34.  
    35.  
    36.     @Override
    37.     public void paintIcon(Component c, Graphics g, int x, int y) {
    38.  
    39.     }
    40.  
    41.     @Override
    42.     public int getIconWidth() {
    43.         return 0;
    44.     }
    45.  
    46.     @Override
    47.     public int getIconHeight() {
    48.         return 0;
    49.     }
    50. }

    图片ICON

    1. package com.qyx.www.lesson04;
    2.  
    3. import javax.swing.*;
    4. import java.awt.*;
    5. import java.net.URL;
    6.  
    7. public class ImageIconDemo extends JFrame {
    8.     public ImageIconDemo() {
    9.         //获取图片的地址
    10.         JLabel label = new JLabel("ImageIcon");
    11.         URL url = ImageIconDemo.class.getResource("tx.jpg");
    12.  
    13.         ImageIcon imageIcon = new ImageIcon(url); //命名不要冲突了
    14.         label.setIcon(imageIcon);
    15.         label.setHorizontalAlignment(SwingConstants.CENTER);
    16.  
    17.         Container container = getContentPane();
    18.         container.add(label);
    19.  
    20.         setVisible(true);
    21.         setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    22.         setBounds(100, 100, 200, 200);
    23.     }
    24.  
    25.  
    26.     public static void main(String[] args) {
    27.                  new ImageIconDemo();
    28.     }
    29. }

    3.4面板

    Jpanel

    1. package com.qyx.www.lesson05;
    2.  
    3. import javax.swing.*;
    4. import java.awt.*;
    5.  
    6. public class JPanelDemo extends JFrame {
    7.  
    8.     public JPanelDemo(){
    9.  
    10.     Container container = this.getContentPane();
    11.  
    12.         container.setLayout(new GridLayout(2,1,10,10));//后面两个参数是间距的意思
    13.  
    14.         JPanel panel1 = new JPanel(new GridLayout(1, 3));
    15.         JPanel panel2 = new JPanel(new GridLayout(1, 2));
    16.         JPanel panel3 = new JPanel(new GridLayout(2, 1));
    17.         JPanel panel4 = new JPanel(new GridLayout(3, 2));
    18.  
    19.         panel1.add(new JButton("1"));
    20.         panel1.add(new JButton("1"));
    21.         panel1.add(new JButton("1"));
    22.         panel2.add(new JButton("2"));
    23.         panel2.add(new JButton("2"));
    24.         panel3.add(new JButton("3"));
    25.         panel3.add(new JButton("3"));
    26.         panel4.add(new JButton("4"));
    27.         panel4.add(new JButton("4"));
    28.         panel4.add(new JButton("4"));
    29.         panel4.add(new JButton("4"));
    30.         panel4.add(new JButton("4"));
    31.         panel4.add(new JButton("4"));
    32.  
    33.         container.add(panel1);
    34.         container.add(panel2);
    35.         container.add(panel3);
    36.         container.add(panel4);
    37.  
    38.         this.setVisible(true);
    39.         this.setSize(500,500);
    40.         this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    41.  
    42.  
    43.     }
    44.  
    45.     public static void main(String[] args) {
    46.         new JPanelDemo();
    47.     }
    48. }

    JScrollPanel

    1. package com.qyx.www.lesson05;
    2.  
    3. import javax.swing.*;
    4. import java.awt.*;
    5.  
    6. public class JScrollDemo extends JFrame {
    7.  
    8.     public JScrollDemo(){
    9.         Container container = this.getContentPane();
    10.  
    11.         //文本域
    12.         JTextArea textArea = new JTextArea(20, 50);
    13.         textArea.setText("欢迎学习狂神说Java");
    14.  
    15.         //Scroll面板
    16.         JScrollPane scrollpane = new JScrollPane(textArea);
    17.         container.add(scrollpane);
    18.  
    19.         this.setVisible(true);
    20.         this.setBounds(100,100,300,350);
    21.         this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    22.     }
    23.  
    24.     public static void main(String[] args) {
    25.         new JScrollDemo();
    26.     }
    27. }

    3.5按钮

    （1）单选按钮

    （2）复选按钮

    3.6列表

    下拉框

    1. package com.qyx.www.lesson05;
    2.  
    3. import javax.swing.*;
    4. import java.awt.*;
    5.  
    6. public class TestComboboxDemo01 extends JFrame {
    7.     public TestComboboxDemo01()  {
    8.         Container container = this.getContentPane();
    9.  
    10.         JComboBox status = new JComboBox();
    11.  
    12.         status.addItem(null);
    13.         status.addItem("正在热映");
    14.         status.addItem("已下架");
    15.         status.addItem("即将上映");
    16.  
    17.         container.add(status);
    18.  
    19.         this.setVisible(true);
    20.         this.setSize(500,350);
    21.         this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    22.     }
    23.  
    24.     public static void main(String[] args) {
    25.              new TestComboboxDemo01();
    26.     }
    27. }

    列表框

    1. package com.qyx.www.lesson05;
    2.  
    3. import javax.swing.*;
    4. import java.awt.*;
    5.  
    6. public class TestComboboxDemo02 extends JFrame {
    7.     public TestComboboxDemo02()  {
    8.         Container container = this.getContentPane();
    9.  
    10.       //生成列表的内容
    11.         String[] contents = {"1","2","3"};
    12.         //列表中需要放入内容
    13.         JList jList = new JList(contents);
    14.  
    15.         container.add(jList);
    16.  
    17.  
    18.         this.setVisible(true);
    19.         this.setSize(500,350);
    20.         this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    21.     }
    22.  
    23.     public static void main(String[] args) {
    24.         new TestComboboxDemo02();
    25.     }
    26. }

    3.7文本框

    文本框

    1. package com.qyx.www.lesson05;
    2.  
    3. import javax.swing.*;
    4. import java.awt.*;
    5.  
    6. public class TestTextDemo01 extends JFrame {
    7.     public TestTextDemo01()  {
    8.         Container container = this.getContentPane();
    9.  
    10.         JTextField textField = new JTextField("hello");
    11.         JTextField textField2 = new JTextField("hello",20);
    12.  
    13.         container.add(textField,BorderLayout.NORTH);
    14.         container.add(textField2,BorderLayout.SOUTH);
    15.  
    16.  
    17.         this.setVisible(true);
    18.         this.setSize(500,350);
    19.         this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    20.     }
    21.  
    22.     public static void main(String[] args) {
    23.         new TestTextDemo01();
    24.     }
    25. }

    密码框

    1. package com.qyx.www.lesson05;
    2.  
    3. import javax.swing.*;
    4. import java.awt.*;
    5.  
    6. public class TestTextDemo03 extends JFrame {
    7.     public TestTextDemo03()  {
    8.         Container container = this.getContentPane();
    9.  
    10.        JPasswordField passwordField = new JPasswordField();//***
    11.         passwordField.setEchoChar('*');
    12.  
    13.         container.add(passwordField);
    14.  
    15.  
    16.         this.setVisible(true);
    17.         this.setSize(500,350);
    18.         this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    19.     }
    20.  
    21.     public static void main(String[] args) {
    22.         new TestTextDemo03();
    23.     }
    24. }

    文本域

    1. package com.qyx.www.lesson05;
    2.  
    3. import javax.swing.*;
    4. import java.awt.*;
    5.  
    6. public class JScrollDemo extends JFrame {
    7.  
    8.     public JScrollDemo(){
    9.         Container container = this.getContentPane();
    10.  
    11.         //文本域
    12.         JTextArea textArea = new JTextArea(20, 50);
    13.         textArea.setText("欢迎学习狂神说Java");
    14.  
    15.         //Scroll面板
    16.         JScrollPane scrollpane = new JScrollPane(textArea);
    17.         container.add(scrollpane);
    18.  
    19.         this.setVisible(true);
    20.         this.setBounds(100,100,300,350);
    21.         this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    22.     }
    23.  
    24.     public static void main(String[] args) {
    25.         new JScrollDemo();
    26.     }
    27. }

    内容较多，但覆盖了GUI的所有方面，后续可以利用GUI实现一个简单贪吃蛇小游戏。

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  • 原文地址：https://blog.csdn.net/qq_60154877/article/details/126339702