GUI编程入门

GUI编程

1、简介

GUI的核心技术：Swing AWT
组件

• 窗口
• 弹框
• 面板
• 文本框
• 列表框
• 按钮
• 图片
• 监听事件
• 鼠标
• 键盘事件

2、AWT

2.1、AWT介绍

2.2、组件和容器

2.2.1、Frame

问题：发现窗口关闭不掉，停止java运行。

package AWTDemo;

import java.awt.*;

//GUI的第一个界面
public class Demo1 {
    
    
    public static void main(String[] args) {
    
    
        Frame frame = new Frame();
        frame.setBackground(Color.BLACK);
        frame.setVisible(true);
        frame.setTitle("小程序");
        frame.setBounds(200,200,600,600);
//        frame.setSize(500,500);
//        frame.setLocation(200,200);
    }
}

2.2.2、Panel

package AWTDemo;

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

public class Demo2 {
    
    
    public static void main(String[] args) {
    
    
        Frame frame = new Frame();
        frame.setBackground(Color.BLACK);
        frame.setVisible(true);
        frame.setTitle("小程序");
        frame.setBounds(200,200,600,600);
        frame.setLayout(null);

        Panel panel = new Panel();
        panel.setBackground(Color.BLUE);
        panel.setVisible(true);
        panel.setBounds(50,50,100,200);

        frame.add(panel);

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

2.3、布局管理器

• 流式布局

package AWTDemo;


import java.awt.*;

public class Demo3 {
    
    
    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");

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

        frame.setSize(200,200);

        //添加按钮
        frame.add(button1);
        frame.add(button2);
        frame.add(button3);

        frame.setVisible(true);
    }
}

• 东西南北东

package AWTDemo;

import java.awt.*;

public class Demo4 {
    
    
    public static void main(String[] args) {
    
    
        Frame frame = new Frame();

        frame.setSize(500,500);
        frame.setVisible(true);
        frame.setLayout(new BorderLayout());

        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);

    }
}

• 表格布局

package AWTDemo;

import java.awt.*;

public class Demo5 {
    
    
    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");

        frame.add(button1);
        frame.add(button2);
        frame.add(button3);
        frame.add(button4);
        frame.add(button5);
        frame.add(button6);

        frame.setVisible(true);
        frame.setLayout(new GridLayout(2,3));
        //frame.setSize(500,500);
        frame.pack();//Java函数，自动排布
    }
}

练习：

package AWTDemo;

import java.awt.*;

public class Test1 {
    
    
    public static void main(String[] args) {
    
    
        Frame frame = new Frame();
        frame.setLayout(new GridLayout(2,1));
        frame.setSize(300,400);
        frame.setLocation(500,500);
        frame.setBackground(Color.BLACK);
        frame.setVisible(true);

        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));

        frame.add(p1);
        frame.add(p3);

        p1.add(new Button("1"),BorderLayout.WEST);
        p2.add(new Button("2"));
        p2.add(new Button("3"));
        p1.add(p2,BorderLayout.CENTER);
        p1.add(new Button("4"),BorderLayout.EAST);

        p3.add(new Button("5"),BorderLayout.WEST);
        for (int i = 6; i < 10; i++) {
    
    
            p4.add(new Button(i+""));
        }
        p3.add(p4,BorderLayout.CENTER);
        p3.add(new Button("10"),BorderLayout.EAST);
    }
}

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

package AWTDemo;

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 Demo6 {
    
    
    public static void main(String[] args) {
    
    
        Frame frame = new Frame();
        frame.setVisible(true);

        Button button = new Button("test");
        //添加按钮按下监听器；使用匿名内部类，可以减少类名
        button.addActionListener(new ActionListener() {
    
    
            @Override
            public void actionPerformed(ActionEvent e) {
    
    
                System.out.println("测试");
                System.out.println(e.getActionCommand());
            }
        });
        frame.add(button,BorderLayout.CENTER);
        frame.pack();
        //调用抽取方法
        WindowClose(frame);
    }
    //抽取方法
    public static void WindowClose(Frame frame){
    
    
        frame.addWindowListener(new WindowAdapter() {
    
    
            @Override
            public void windowClosing(WindowEvent e) {
    
    
                System.exit(0);
            }
        });
    }
}

多个按钮共享一个事件监听器

package AWTDemo;

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

public class Demo7 {
    
    
    public static void main(String[] args) {
    
    
        Frame frame = new Frame();
        frame.setVisible(true);
        frame.setLayout(new GridLayout(1, 2));

        Button button1 = new Button("Start");
        Button button2 = new Button("Stop");

        button1.setActionCommand("Stop->Start");
        button2.setActionCommand("Start->Stop");

        MyActionListener1 myActionListener1 = new MyActionListener1();

        button1.addActionListener(myActionListener1);
        button2.addActionListener(myActionListener1);

        frame.add(button1);
        frame.add(button2);
        frame.pack();
    }
}
class MyActionListener1 implements ActionListener {
    
    

    @Override
    public void actionPerformed(ActionEvent e) {
    
    
        System.out.println("Msg: "+e.getActionCommand());//或者输入框的文本
    }
}

2.5、输入框TextField 监听事件

package AWTDemo;

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

public class Demo8 {
    
    
    public static void main(String[] args) {
    
    
        //启动！
        new MyFrame();
    }
}

class MyFrame extends Frame{
    
    
    public MyFrame(){
    
    
        TextField textField = new TextField();
        add(textField);
        //监听文本框输入的文字
        MyActionListener myActionListener = new MyActionListener();
        //按下Enter，就会触发输入框事件
        textField.addActionListener(myActionListener);
        //设置替换字符
        textField.setEchoChar('*');

        setVisible(true);
        pack();
    }
}

class MyActionListener implements ActionListener{
    
    

    @Override
    public void actionPerformed(ActionEvent e) {
    
    
        TextField textField = (TextField) e.getSource();
        System.out.println(textField.getText());//或者输入框的文本
        textField.setText("");
    }
}

2.6、简单计算器（组合和内部类的使用）

package AWTDemo;

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

//简易计算器
public class Test2 {
    
    
    public static void main(String[] args) {
    
    
        Calculator calculator = new Calculator();
    }
}

//计算器类
class Calculator extends Frame {
    
    
    public Calculator()  {
    
    
        //3个单行文本框
        TextField num1 = new TextField(10);
        TextField num2 = new TextField(10);
        TextField num3 = new TextField(10);
        //1个标签
        Label label = new Label("+");
        //1个按钮
        Button button = new Button("=");
        CalculatorListener calculatorListener = new CalculatorListener(num1,num2,num3);
        button.addActionListener(calculatorListener);

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

        setVisible(true);
        pack();
    }
}

//监听器
class CalculatorListener implements ActionListener{
    
    
    private TextField num1,num2,num3;
    public CalculatorListener(TextField num1,TextField num2,TextField num3) {
    
    
        this.num1=num1;
        this.num2=num2;
        this.num3=num3;
    }

    @Override
    public void actionPerformed(ActionEvent e) {
    
    
        //1、获取相加的两个数
        int n1 = Integer.parseInt(num1.getText());
        int n2 = Integer.parseInt(num2.getText());

        //2、计算，把结果放在第三个文本框
        num3.setText(""+(n1+n2));

        //3、清除前面两个文本框内容
        num1.setText("");
        num2.setText("");
    }
}

组合改变后的代码(面向对象的写法)

package AWTDemo;

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

//简易计算器
public class Test2 {
    
    
    public static void main(String[] args) {
    
    
        new Calculator().loadFrame();
    }
}

//计算器类
class Calculator extends Frame {
    
    
    //属性
    TextField num1,num2,num3;

    //方法
    public void loadFrame()  {
    
    
        //3个单行文本框
         num1 = new TextField(10);
         num2 = new TextField(10);
         num3 = new TextField(10);
        //1个标签
        Label label = new Label("+");
        //1个按钮
        Button button = new Button("=");
        CalculatorListener calculatorListener = new CalculatorListener(this);
        button.addActionListener(calculatorListener);

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

        setVisible(true);
        pack();
    }
}

使用内部类后的写法，简化了代码
内部类的最大好处：访问外部的属性和方法

package AWTDemo;

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

//简易计算器
public class Test2 {
    
    
    public static void main(String[] args) {
    
    
        new Calculator().loadFrame();
    }
}

//计算器类
class Calculator extends Frame {
    
    
    //属性
    TextField num1,num2,num3;

    //方法
    public void loadFrame()  {
    
    
        //3个单行文本框
         num1 = new TextField(10);
         num2 = new TextField(10);
         num3 = new TextField(10);
        //1个标签
        Label label = new Label("+");
        //1个按钮
        Button button = new Button("=");
        button.addActionListener(new CalculatorListener());

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

        setVisible(true);
        pack();
    }
    //监听器
    private class CalculatorListener implements ActionListener{
    
    

        @Override
        public void actionPerformed(ActionEvent e) {
    
    
            //1、获取相加的两个数
            //2、计算，把结果放在第三个文本框
            //3、清除前面两个文本框内容
            int n1 = Integer.parseInt(num1.getText());
            int n2 = Integer.parseInt(num2.getText());
            num3.setText(""+(n1+n2));
            num1.setText("");
            num2.setText("");
        }
    }
}

2.7、画笔

package AWTDemo;

import java.awt.*;

public class Demo9 {
    
    
    public static void main(String[] args) {
    
    
        new MyPaint().LoadFrame();
    }
}

class MyPaint extends Frame{
    
    

    //画板窗口
    public void LoadFrame(){
    
    
        setVisible(true);
        setBounds(200,200,600,600);
    }

    @Override
    public void paint(Graphics g) {
    
    
        //super.paint(g);
        g.setColor(Color.RED);
        g.fillRect(50,50,100,200);//实心矩形
        g.drawOval(250,250,100,100);//圆
        g.fillOval(350,350,100,100);//实心圆
    }
}

2.8、鼠标监听

鼠标在画板上画点

package AWTDemo;

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

public class Demo9 {
    
    
    public static void main(String[] args) {
    
    
        new MyPaint("画图");
    }
}

class MyPaint extends Frame{
    
    
    ArrayList<Point> points;

    //画板
    public MyPaint(String title) {
    
    
        super(title);
        setBounds(200,200,600,600);
        points=new ArrayList<>();

        setVisible(true);
        this.addMouseListener(new MyMouseListencer());

    }

    //画笔,把点显示出来.其实点就是实心圆
    @Override
    public void paint(Graphics g) {
    
    
        Iterator<Point> iterator = points.iterator();
        while (iterator.hasNext()){
    
    
            Point next = iterator.next();
            g.fillOval(next.x,next.y,10,10);
            g.setColor(Color.BLACK);
        }
    }
    //添加点到集合的方法
    public void addPoint(Point point){
    
    
        points.add(point);
    }

    //鼠标点击事件，生成点
    private class MyMouseListencer extends MouseAdapter{
    
    
        @Override
        public void mouseClicked(MouseEvent e) {
    
    
            MyPaint myPaint = (MyPaint) e.getSource();
            myPaint.addPoint(new Point(e.getX(), e.getY()));
            //每次点击鼠标要重画
            myPaint.repaint();
        }
    }
}

2.9、窗口监听

跟上面类似

2.10、键盘监听

跟上面类似

3、Swing

属于对AWT的加强，封装，有很多更强的功能，能简化开发。

3.1、JFrame

package swingdemo;

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

public class Demo1 {
    
    
    public static void main(String[] args) {
    
    
        new Demo1().init();
    }
    public  void init(){
    
    
        JFrame frame = new JFrame("这是一个JFrame窗口");
        frame.setVisible(true);
        frame.setBounds(100,100,200,200);

        JLabel jLabel = new JLabel("这是一个JLable");

        //直接设置背景颜色不行，需要设置容器颜色
        frame.setBackground(Color.red);
        frame.add(jLabel);
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }
}

设置容器背景色，加便签水平居中

package swingdemo;

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

public class Demo2 {
    
    
    public static void main(String[] args) {
    
    
        new MyJframe().init();
    }
}

class MyJframe extends JFrame{
    
    
    public void init(){
    
    
        this.setVisible(true);
        this.setBounds(200,200,200,200);
        //获取容器
        Container contentPane = this.getContentPane();
        //设置容器背景
        contentPane.setBackground(Color.red);
        JLabel jLabel = new JLabel("这是一个JLable");
        this.add(jLabel);
        //设置水平居中
        jLabel.setHorizontalAlignment(SwingConstants.CENTER);
    }
}

3.2、JDialog 弹窗

package swingdemo;

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

//主窗口
public class Demo3 extends JFrame {
    
    
    public Demo3(){
    
    
        this.setVisible(true);
        this.setSize(700,500);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        //JFrame 放东西，容器
        Container contentPane = this.getContentPane();

        //绝对布局
        contentPane.setLayout(null);

        JButton jButton = new JButton("点击弹出一个对话框");
        jButton.setBounds(30,30,200,50);

        //点击按钮弹窗
        jButton.addActionListener(new ActionListener() {
    
     //监听器
                @Override
            public void actionPerformed(ActionEvent e) {
    
    
                new MyDialog();
            }
        });

        contentPane.add(jButton);
    }

    public static void main(String[] args) {
    
    
        new Demo3();
    }
}

//弹窗的窗口
class MyDialog extends JDialog{
    
    
    public MyDialog(){
    
    
        this.setVisible(true);
        this.setBounds(100,100,500,500);
        Container container = this.getContentPane();
        container.setLayout(null);
        container.add(new Label("学JAVA"));
    }
}

3.3、JLable

Icon

/**
 * Author：ckvsok
 * Date：2021/3/13
 **/

package swingdemo;

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

//图标，需要实现类，JFrame继承
public class Demo4 extends JFrame implements Icon {
    
    
    private int width;
    private int height;

    public Demo4() {
    
    
    }

    public Demo4(int width,int height){
    
    
        this.width=width;
        this.height=height;
    }

    public void init(){
    
    
        Demo4 icon = new Demo4(20, 20);
        //图标可以放在标签上，也可以放在按钮上
        JLabel jLabel = new JLabel("icon",icon,SwingConstants.CENTER);
        Container contentPane = this.getContentPane();
        contentPane.add(jLabel);

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

    public static void main(String[] args) {
    
    
        new Demo4().init();
    }

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

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

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

ImageIcon

/**
 * Author：ckvsok
 * Date：2021/3/13
 **/

package swingdemo;

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

public class Demo5 extends JFrame {
    
    

    public static void main(String[] args) {
    
    
        new Demo5();
    }

    public Demo5()  {
    
    
		//获取图片的地址
        URL url = Demo5.class.getResource("ck.png");
        ImageIcon imageIcon = new ImageIcon(url);

        JLabel label = new JLabel("IconImage");
        label.setIcon(imageIcon);

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

        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setBounds(120,156,222,222);
    }

}

3.4、JPanel

/**
 * Author：ckvsok
 * Date：2021/3/13
 **/

package swingdemo;

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

public class Demo6 extends JFrame {
    
    
    public static void main(String[] args) {
    
    
        new Demo6();
    }
    public Demo6(){
    
    
        Container contentPane = getContentPane();
        contentPane.setLayout(new GridLayout(2,2,10,15));//后面的参数意思是间距

        JPanel panel1 = new JPanel();
        JPanel panel2 = new JPanel();
        JPanel panel3 = new JPanel();
        JPanel panel4 = new JPanel();

        panel1.setLayout(new GridLayout(1,2));
        panel2.setLayout(new GridLayout(2,1));
        panel3.setLayout(new GridLayout(1,3));
        panel4.setLayout(new GridLayout(3,2));

        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"));
        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);

        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setBounds(123,157,851,450);
    }
}

JScrollPane

/**
 * Author：ckvsok
 * Date：2021/3/13
 **/

package swingdemo;

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

public class Demo7 extends JFrame {
    
    
    public static void main(String[] args) {
    
    
        new Demo7();
    }
    public Demo7(){
    
    
        Container container = getContentPane();

        //文本域
        JTextArea textArea = new JTextArea(10, 5);
        textArea.setText("Input your story");

        //Scroll面板
        JScrollPane jScrollPane = new JScrollPane(textArea);

        container.add(jScrollPane);
        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setBounds(123,157,851,450);
    }
}

3.5、JButton

图片按钮

/**
 * Author：ckvsok
 * Date：2021/3/13
 **/

package swingdemo;

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

public class Demo8 extends JFrame {
    
    
    public static void main(String[] args) {
    
    
        new Demo8();
    }
    public Demo8(){
    
    
        Container container = getContentPane();

        //图片按钮
        URL url = Demo8.class.getResource("ck.png");
        ImageIcon icon = new ImageIcon(url);
        JButton button = new JButton(icon);
        container.add(button);

        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setBounds(100,100,500,800);
    }
}

单选框

/**
 * Author：ckvsok
 * Date：2021/3/13
 **/

package swingdemo;


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

public class Demo9 extends JFrame {
    
    
    public static void main(String[] args) {
    
    
        new Demo9();
    }

    public Demo9() {
    
    
        Container container = getContentPane();
        container.setLayout(new FlowLayout());

        //单选框
        JRadioButton radioButton1 = new JRadioButton("1");
        JRadioButton radioButton2 = new JRadioButton("2");

        //单选框需要分组，只能选择一个
        ButtonGroup buttonGroup = new ButtonGroup();
        buttonGroup.add(radioButton1);
        buttonGroup.add(radioButton2);
        container.add(radioButton1);
        container.add(radioButton2);

        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setBounds(100, 100, 500, 800);
    }
}

多选框

/**
 * Author：ckvsok
 * Date：2021/3/13
 **/

package swingdemo;

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

public class Demo10 extends JFrame {
    
    
    public static void main(String[] args) {
    
    
        new Demo10();
    }

    public Demo10() {
    
    
        Container container = getContentPane();
        container.setLayout(new FlowLayout());

        //多选框
        JCheckBox checkBox1 = new JCheckBox("1");
        JCheckBox checkBox2 = new JCheckBox("2");
        container.add(checkBox1);
        container.add(checkBox2);

        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setBounds(100, 100, 500, 800);
    }
}

3.6、列表

下拉框

/**
 * Author：ckvsok
 * Date：2021/3/13
 **/

package swingdemo;

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

public class Demo11 extends JFrame {
    
    
    public Demo11(){
    
    
        Container container = getContentPane();
        container.setLayout(new FlowLayout());

        //下拉框
        JComboBox comboBox = new JComboBox();
        //设置默认值
        comboBox.addItem(null);
        comboBox.addItem("1");
        comboBox.addItem("2");
        comboBox.addItem("3");

        container.add(comboBox);

        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setBounds(100, 100, 500, 800);
    }

    public static void main(String[] args) {
    
    
       new  Demo11();
    }
}

列表框

/**
 * Author：ckvsok
 * Date：2021/3/13
 **/

package swingdemo;

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

public class Demo12 extends JFrame {
    
    
    public Demo12(){
    
    
        Container container = getContentPane();
        container.setLayout(new FlowLayout());

        //列表框
        JList list = new JList();
        Vector vector = new Vector();
        list.setListData(vector);

        vector.add("111111111");
        vector.add("222222222");
        vector.add("333333333");

        container.add(list);

        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setBounds(100, 100, 500, 800);
    }

    public static void main(String[] args) {
    
    
        new  Demo12();
    }
}

3.7、文本框

文本框
密码框
文本域

/**
 * Author：ckvsok
 * Date：2021/3/13
 **/

package swingdemo;

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

public class Demo13  extends JFrame {
    
    
    public Demo13(){
    
    
        Container container = getContentPane();
        container.setLayout(new FlowLayout());

        //文本框 单行
        JTextField textField = new JTextField("文本框");
        //密码框
        JPasswordField passwordField = new JPasswordField("密码框");
        //文本域, 多行 可以换行
        JTextArea textArea = new JTextArea("文本域");

        container.add(textField);
        container.add(passwordField);
        container.add(textArea);

        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setBounds(100, 100, 500, 800);
    }

    public static void main(String[] args) {
    
    
        new  Demo13();
    }
}