idea开发java swing桌面程序教程

GUI编程

组建

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

1、简介

GUI的核心技术：Swing AWT

为什么不流行？

1. 界面不美观。
2. 需要jre环境。（没必要为一个5M的小游戏下载几百M的jre）

但是学了java的GUI编程，有助于了解MVC架构，了解监听。

2、AWT

2.1、Awt介绍

1. 包括很多类和接口
2. 元素：窗口，按钮，文本框
3. java.awt

2.2、Frame

import java.awt.*;

//GUI的第一个程序
public class TestFrame {
    public static void main(String[] args) {
//        不会看源码
        Frame frame = new Frame("我的第一个java图形界面窗口");

//        需要设置可见性
        frame.setVisible(true);

//        设置窗口大小
        frame.setSize(400, 400);

//        设置背景颜色    Color
        frame.setBackground(Color.yellow);

//        弹出的初始位置
        frame.setLocation(300, 300);

//        设置大小固定
        frame.setResizable(false);
    }
}

进一步封装

import java.awt.*;

//GUI的第一个程序
public class TestFrame {
    public static void main(String[] args) {

        MyFrame myFrame1 = new MyFrame(100, 100, 200, 200, Color.BLUE);
        MyFrame myFrame2 = new MyFrame(300, 100, 200, 200, Color.yellow);
        MyFrame myFrame3 = new MyFrame(100, 300, 200, 200, Color.red);
        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));
        setBackground(color);
        setBounds(x, y, w, h);
        setVisible(true);

    }
}

2.3、面板Panel

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

public abstract class TestPanel {
    public static void main(String[] args) {
        Frame frame = new Frame();
        Panel panel = new Panel();

//        设置布局
        frame.setLayout(null);

//        坐标
        frame.setBounds(300, 300, 200, 200);
        frame.setBackground(new Color(168, 123, 82));

//        panel设置坐标，相对于Frame
        panel.setBounds(50,50,100,100 );
        panel.setBackground(new Color(68, 52, 134));

        frame.add(panel);

        frame.setVisible(true);

//        监听事件，监听窗口关闭事件 System.exit(0)
//        适配器模式
        frame.addWindowListener(new WindowAdapter() {
//            窗口点击关闭时需要做的事情
            @Override
            public void windowClosing(WindowEvent e) {
//                结束程序
                System.exit(0);
            }
        });
    }
}

2.4、布局管理器

• 流式布局

import java.awt.*;

public class TestFlowLayout {
    public static void main(String[] args) {
        Frame frame = new Frame();

//        组建-按钮
        Button button1 = new Button("button1");
        Button button2 = new Button("button2");
        Button button3 = new Button("button3");

//        设置为流式布局
        //frame.setLayout(new FlowLayout());
        //frame.setLayout(new FlowLayout(FlowLayout.LEFT));
        frame.setLayout(new FlowLayout(FlowLayout.RIGHT));
        frame.setSize(200,200);

//        把按钮添加上去
        frame.add(button1);
        frame.add(button2);
        frame.add(button3);

        frame.setVisible(true);
    }
}

• 东西南北中

import java.awt.*;

public class TestBorderLayout {
    public static void main(String[] args) {
        Frame frame = new Frame("TestBorderLayout");

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

        frame.setSize(200,200);
        frame.setVisible(true);
    }
}

• 表格布局

import java.awt.*;

public class TestGridLayout {
    public static void main(String[] args) {
        Frame frame = new Frame("TestGridLayout");

        Button btn1 = new Button("btn1");
        Button btn2 = new Button("btn2");
        Button btn3 = new Button("btn3");
        Button btn4 = new Button("btn4");
        Button btn5 = new Button("btn5");
        Button btn6 = new Button("btn6");

        frame.setLayout(new GridLayout(3,2));

        frame.add(btn1);
        frame.add(btn2);
        frame.add(btn3);
        frame.add(btn4);
        frame.add(btn5);
        frame.add(btn6);

        frame.pack();
        frame.setVisible(true);
    }
}

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

1. 东西南北中
2. 表格

4. 大小，定位，背景颜色，定位，监听。

2.5、事件监听

事件监听：当某个事情发生的时候，干什么？

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

public class TestActionEvent {
    public static void main(String[] args) {
//        按下按钮，触发一些事件
        Frame frame = new Frame();
        Button button = new Button();
//        因为，addActionListener()需要一个ActionListener，所以我们需要构造一个ActionListener
        MyActionListener myActionListener = new MyActionListener();
        button.addActionListener(myActionListener);
        frame.add(button,BorderLayout.CENTER);
        frame.pack();

        windowClose(frame);
        frame.setVisible(true);
    }
//    关闭窗体事件
    private static void windowClose(Frame frame){
        frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
}

//事件监听
class MyActionListener implements ActionListener{

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

多个按钮共用一个监听器

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

public class TestActionTwo {
    public static void main(String[] args) {
//        两个按钮，实现一个监听
//        开始    停止
        Frame frame = new Frame("开始-停止");
        Button button1 = new Button("start");
        Button button2 = new Button("stop");

//        可以显示的定义触发会返回的命令，如果不显示定义，则会走默认的值
//        可以多个按钮只写一个监听类
        button2.setActionCommand("button2_stop");

        MyMonitor myMonitor = new MyMonitor();

        button1.addActionListener(myMonitor);
        button2.addActionListener(myMonitor);

        frame.add(button1, BorderLayout.NORTH);
        frame.add(button2, BorderLayout.SOUTH);

        frame.pack();
        frame.setVisible(true);
    }
}

class MyMonitor implements ActionListener{

    @Override
    public void actionPerformed(ActionEvent e) {
        if(e.getActionCommand().equals("start")){
            System.out.println("开始按钮监听");
        }else{
            System.out.println("停止按钮监听");
        }
    }
}

2.6、输入框 TextField 监听

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

public class TestTest01 {
    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{

    @Override
    public void actionPerformed(ActionEvent e) {
        TextField filed = (TextField) e.getSource();    //获得的一些资源，返回的一个对象
        System.out.println(filed.getText());    //获得输入框的文本
        filed.setText("");  //回车清空
    }
}

2.7、简易计算器，组合+内部类回顾复习

oop原则：组合，大于继承！

目前代码：

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

public class TextText02 {
    public static void main(String[] args) {
        new Calculator();
    }
}

class Calculator extends Frame{
    public Calculator(){
//        3个文本框
        TextField num1 = new TextField(10);
        TextField num2 = new TextField(10);
        TextField num3 = new TextField(20);

//        1个按钮
        Button button = new Button("=");
        button.addActionListener(new MyCalculatorListener(num1, num2, num3));

//        一个标签
        Label label = new Label("+");

//        布局
        setLayout(new FlowLayout());

        add(num1);
        add(label);
        add(num2);
        add(button);
        add(button);
        add(num3);

        pack();
        setVisible(true);
    }
}

//监听器类
class MyCalculatorListener implements ActionListener{

//    获取三个变量
    private TextField num1, num2, num3;

    public MyCalculatorListener(TextField num1, TextField num2, TextField num3){
        this.num1 = num1;
        this.num2 = num2;
        this.num3 = num3;
    }

    @Override
    public void actionPerformed(ActionEvent e) {
//        1.获得加数和被加数
        int n1 = Integer.parseInt(num1.getText());
        int n2 = Integer.parseInt(num2.getText());

//        2.将这个值 + 运算后，放到第三个框
        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：

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

public class TextText02 {
    public static void main(String[] args) {
        new Calculator().loading();
    }
}

class Calculator extends Frame{

//    属性
    TextField num1, num2, num3;

//    方法
    public void loading(){

        num1 = new TextField(10);//字符数
        num2 = new TextField(10);//字符数
        num3 = new TextField(20);//字符数
        Button button = new Button("=");
        button.addActionListener(new MyCalculatorListener(this));
        Label label = new Label("+");

//        布局
        setLayout(new FlowLayout());
        add(num1);
        add(label);
        add(num2);
        add(button);
        add(button);
        add(num3);

        pack();
        setVisible(true);
    }
}

//监听器类
class MyCalculatorListener implements ActionListener{

    Calculator calculator = null;

    public MyCalculatorListener(Calculator calculator){
        this.calculator = calculator;
    }

    @Override
    public void actionPerformed(ActionEvent e) {
//        1.获得加数和被加数
        int n1 = Integer.parseInt(calculator.num1.getText());
        int n2 = Integer.parseInt(calculator.num2.getText());

//        2.将这个值 + 运算后，放到第三个框
        calculator.num3.setText(""+(n1+n2));

//        3.清除前两个框
        calculator.num1.setText("");
        calculator.num2.setText("");
    }
}

内部类：

• 更好的包装

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

public class TextText02 {
    public static void main(String[] args) {
        new Calculator().loading();
    }
}

class Calculator extends Frame{

//    属性
    TextField num1, num2, num3;

//    方法
    public void loading(){

        num1 = new TextField(10);//字符数
        num2 = new TextField(10);//字符数
        num3 = new TextField(20);//字符数
        Button button = new Button("=");
        button.addActionListener(new MyCalculatorListener());
        Label label = new Label("+");

//        布局
        setLayout(new FlowLayout());
        add(num1);
        add(label);
        add(num2);
        add(button);
        add(button);
        add(num3);

        pack();
        setVisible(true);
    }

//    监听器类
//    内部类最大的好处，就是可以畅通无阻的访问外部的属性和方法！
    class MyCalculatorListener implements ActionListener{

        @Override
        public void actionPerformed(ActionEvent e) {
//        1.获得加数和被加数
            int n1 = Integer.parseInt(num1.getText());
            int n2 = Integer.parseInt(num2.getText());

//        2.将这个值 + 运算后，放到第三个框
            num3.setText(""+(n1+n2));

//        3.清除前两个框
            num1.setText("");
            num2.setText("");
        }
    }
}

2.8、画笔

import java.awt.*;

public class TestPaint {
    public static void main(String[] args) {
        new MyPaint().loading();
    }
}

class MyPaint extends Frame{

    public void loading(){
        setBounds(200,200,600,600);
        setVisible(true);
    }

//    画笔

    @Override
    public void paint(Graphics g) {
//        画笔，画笔需要颜色，画笔可以画画
        g.setColor(Color.red);
        g.drawOval(100,100,100,100);

//        养成习惯，画笔用完，将他还原为最初的颜色
    }
}

2.9、鼠标监听

import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import java.util.Iterator;

public class TestMouseListener {
    public static void main(String[] args) {
        new MyFrame("画点");
    }
}

//自己的类
class MyFrame extends Frame {

//    用一个集合存点
    ArrayList points;

    public MyFrame(String title){
        super(title);
        setBounds(200,200,500,500);

        points = new ArrayList<>();
//         鼠标监听器，正对这个窗口
        this.addMouseListener(new MyMouseListener());
        setVisible(true);

    }

    @Override
    public void paint(Graphics g) {
        Iterator iterator = points.iterator();
        while(iterator.hasNext()){
            Point point = (Point) iterator.next();
            g.setColor(Color.BLACK);
            g.fillOval(point.x, point.y,10,10);
        }
    }


//    添加一个点到界面上
    public void addPaint(Point point){
        points.add(point);
    }

//    适配器模式
    private class MyMouseListener extends MouseAdapter{
//        鼠标按下，弹起，按住不放
        @Override
        public void mousePressed(MouseEvent e) {
            MyFrame frame = (MyFrame) e.getSource();

//            这个点就是鼠标的点
            frame.addPaint(new Point(e.getX(), e.getY()));

            frame.repaint();//刷新
        }
    }
}

2.10、窗口监听

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

public class TestWindowListener {
    public static void main(String[] args) {
        new WindowFrame();
    }
}

class WindowFrame extends Frame{
    public WindowFrame(){
        setBounds(100,100,400,400);
        setVisible(true);

        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.out.println("关闭窗口");
            }

            @Override
            public void windowActivated(WindowEvent e) {
                System.out.println("激活窗口");
            }
        });
    }
}

2.11、键盘监听

import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class TestKeyListener {
    public static void main(String[] args) {
        new KeyFrame();
    }
}
class KeyFrame extends Frame{
    public KeyFrame(){
        setBounds(1,2,300,400);
        setVisible(true);

        this.addKeyListener(new KeyAdapter() {
            @Override
            public void keyPressed(KeyEvent e) {
                int keyCode = e.getKeyCode();
                if (keyCode == KeyEvent.VK_UP) {
                    System.out.println("你按了上建");
                }
            }
        });
    }
}

3、Swing

3.1、窗口、面板

import javax.swing.*;
import java.awt.*;

public class JFrameDemo {
//    init()
    public void init(){
//        顶级窗口
        JFrame jf = new JFrame("这是一个JFrame窗口");
        jf.setVisible(true);
        jf.setBounds(100,100,200,200);

//        设置文字
        JLabel label = new JLabel("这是一段话");
        jf.add(label);

        label.setHorizontalAlignment(SwingConstants.CENTER);

//        获得一个容器
        Container contentPane = jf.getContentPane();
        contentPane.setBackground(Color.yellow);

//        关闭窗口
        jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

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

3.2、弹窗

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class DialogDemo extends JFrame {

    public DialogDemo(){
        this.setVisible(true);
        this.setBounds(100,100,600,600);

        Container contentPane = this.getContentPane();
//        绝对布局
        contentPane.setLayout(null);
        contentPane.setBackground(Color.red);

        JButton button = new JButton("点击弹出一个对话框");
        button.setBounds(50,50,50,50);

//        点击这个按钮时，弹出一个窗口
        button.addActionListener(new ActionListener() { //监听器
            @Override
            public void actionPerformed(ActionEvent e) {
                new MyDialogDemo();
            }
        });

        contentPane.add(button);

        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

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

class MyDialogDemo extends JDialog{
    public MyDialogDemo(){
        this.setVisible(true);
        this.setBounds(500,500,500,500);

        Container contentPane = this.getContentPane();
        contentPane.setLayout(null);

        contentPane.add(new JLabel("哈哈哈"));
    }
}

3.3、标签

label

new JLabel("xxx");

图标icon

import javax.swing.*;
import java.awt.*;

public class IconDemo extends JFrame implements Icon {
    private int width;
    private int heigth;

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

    public void init(){
        IconDemo iconDemo = new IconDemo(15, 15);
        JLabel label = new JLabel("icontest", iconDemo, SwingConstants.CENTER);

        Container contentPane = this.getContentPane();
        contentPane.add(label);

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

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

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

    @Override
    public int getIconWidth() {
        return width;
    }

    @Override
    public int getIconHeight() {
        return heigth;
    }
}

图片icon

import javax.swing.*;
import java.awt.*;
import java.net.URL;

public class ImageIconDemo extends JFrame {

    public ImageIconDemo() {
//        获取图片的地址
        JLabel label = new JLabel("ImageIcon");
        URL url = ImageIconDemo.class.getResource("tx.jpg");

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

        Container contentPane = getContentPane();
        contentPane.add(label);
    }
}

3.4、面板

• JPanel

import javax.swing.*;
import java.awt.*;

public class JPanelDemo extends JFrame {
    public JPanelDemo(){
        Container contentPane = this.getContentPane();

        contentPane.setLayout(new GridLayout(2,2,10,10));

        JPanel panel1 = new JPanel(new GridLayout(1, 3));
        JPanel panel2 = new JPanel(new GridLayout(1, 2));
        JPanel panel3 = new JPanel(new GridLayout(2, 1));
        JPanel panel4 = new JPanel(new GridLayout(3, 2));

        panel1.add(new JButton("1"));
        panel1.add(new JButton("1"));
        panel1.add(new JButton("1"));
        panel2.add(new JButton("2"));
        panel2.add(new JButton("2"));
        panel3.add(new JButton("3"));
        panel3.add(new JButton("3"));
        panel4.add(new JButton("4"));
        panel4.add(new JButton("4"));
        panel4.add(new JButton("4"));
        panel4.add(new JButton("4"));
        panel4.add(new JButton("4"));
        panel4.add(new JButton("4"));

        contentPane.add(panel1);
        contentPane.add(panel2);
        contentPane.add(panel3);
        contentPane.add(panel4);

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

    }

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

• JScrollPanel

import javax.swing.*;
import java.awt.*;

public class JScrollDemo extends JFrame {

    public JScrollDemo(){
        Container contentPane = this.getContentPane();

        JTextArea jTextArea = new JTextArea();
        jTextArea.setText("这是一个文本框");

//        Scroll面板
        JScrollPane jScrollPane = new JScrollPane(jTextArea);
        contentPane.add(jScrollPane);

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

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

3.5、按钮

• 图片按钮

import javax.swing.*;
import java.awt.*;
import java.net.URL;

public class JButtonDemo01 extends JFrame {

    public JButtonDemo01(){
        Container contentPane = this.getContentPane();
//        将一个图片变为图标
        URL resource = JButtonDemo01.class.getResource("tx.jpg");
        Icon icon = new ImageIcon(resource);

//        把这个图标放到按钮上
        JButton button = new JButton();
        button.setIcon(icon);
        button.setToolTipText("图片按钮");
        
        contentPane.add(button);

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

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

• 单选按钮

import javax.swing.*;
import java.awt.*;
import java.net.URL;

public class JButtonDemo02 extends JFrame {

    public JButtonDemo02(){
        Container contentPane = this.getContentPane();
//        将一个图片变为图标
        URL resource = JButtonDemo01.class.getResource("tx.jpg");
        Icon icon = new ImageIcon(resource);

//        单选框
        JRadioButton jRadioButton1 = new JRadioButton("JRadioButton1");
        JRadioButton jRadioButton2 = new JRadioButton("JRadioButton2");
        JRadioButton jRadioButton3 = new JRadioButton("JRadioButton3");

//        由于单选框只能选择一个，分组，一组中只能选择一个
        ButtonGroup group = new ButtonGroup();
        group.add(jRadioButton1);
        group.add(jRadioButton2);
        group.add(jRadioButton3);

        contentPane.add(jRadioButton1, BorderLayout.NORTH);
        contentPane.add(jRadioButton2, BorderLayout.CENTER);
        contentPane.add(jRadioButton3, BorderLayout.SOUTH);

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

    public static void main(String[] args) {
        new JButtonDemo02();
    }
}

• 复选按钮

import javax.swing.*;
import java.awt.*;
import java.net.URL;

public class JButtonDemo03 extends JFrame {

    public JButtonDemo03(){
        Container contentPane = this.getContentPane();
//        将一个图片变为图标
        URL resource = JButtonDemo01.class.getResource("tx.jpg");
        Icon icon = new ImageIcon(resource);

//        多选框
        JCheckBox jCheckBox1 = new JCheckBox("jCheckBox1");
        JCheckBox jCheckBox2 = new JCheckBox("jCheckBox2");

        contentPane.add(jCheckBox1, BorderLayout.NORTH);
        contentPane.add(jCheckBox2, BorderLayout.CENTER);

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

    public static void main(String[] args) {
        new JButtonDemo03();
    }
}

3.6、列表

• 下拉框

import javax.swing.*;
import java.awt.*;

public class TestComboboxDemo01 extends JFrame {
    public TestComboboxDemo01(){

        Container contentPane = this.getContentPane();

        JComboBox<Object> status = new JComboBox();

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

        contentPane.add(status);

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

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

• 列表框

import javax.swing.*;
import java.awt.*;
import java.util.Vector;

public class TestComboboxDemo02 extends JFrame {

    public TestComboboxDemo02(){

        Container contentPane = this.getContentPane();

//        生成列表的内容
        Vector objects = new Vector();
        objects.add("zhangsan");
        objects.add("lisi");
        objects.add("wangwu");

        JList jList = new JList(objects);
        contentPane.add(jList);

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

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

• 应用场景

1. 选择地区，或者一些单个选项。

1. 列表，展示信息，一般是动态扩容。

3.7、文本框

• 文本框

import javax.swing.*;
import java.awt.*;

public class TestTestDemo01 extends JFrame {
    public TestTestDemo01(){

        Container contentPane = this.getContentPane();

        JTextField jTextField01 = new JTextField("hellow");
        JTextField jTextField02 = new JTextField("world");

        contentPane.add(jTextField01, BorderLayout.NORTH);
        contentPane.add(jTextField02, BorderLayout.SOUTH);

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

    public static void main(String[] args) {
        new TestTestDemo01();
    }
}

• 密码框

import javax.swing.*;
import java.awt.*;

public class TestTestDemo02 extends JFrame {
    public TestTestDemo02(){

        Container contentPane = this.getContentPane();

        JPasswordField jPasswordField = new JPasswordField();   //默认已经是***了
        jPasswordField.setEchoChar('*');

        contentPane.add(jPasswordField);

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

    public static void main(String[] args) {
        new TestTestDemo02();
    }
}

• 文本域

import javax.swing.*;
import java.awt.*;

public class JScrollDemo extends JFrame {

    public JScrollDemo(){
        Container contentPane = this.getContentPane();

        JTextArea jTextArea = new JTextArea();
        jTextArea.setText("这是一个文本框");

//        Scroll面板
        JScrollPane jScrollPane = new JScrollPane(jTextArea);
        contentPane.add(jScrollPane);

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

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