Java（GUI编程03）

3. Swing3.1 窗口、面板3.2 弹窗3.3 标签3.4 面板3.5 按钮3.6 列表3.7 文本框

Zachsj

364人浏览 · 2022-02-27 16:32:19

Zachsj · 2022-02-27 16:32:19 发布

Java（GUI编程03）

参考视频：14、Swing之JFrame窗体（狂神）

3. Swing

3.1 窗口、面板

示例一：

package com.zach.lesson04;

import javax.swing.*;

public class JFrameDemo {

    //init();初始化
    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
        JLabel label = new JLabel("欢迎来到狂神说Java系列");
        jf.add(label);

        //容器实例化
        

        //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();
    }
}

示例二：（标签居中）

package com.zach.lesson04;

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

public class JFrameDemo02 {
    public static void main(String[] args) {
        new MyJFrame2().init();
    }
}

class MyJFrame2 extends JFrame{
    public void init(){
        this.setBounds(10,10,200,300);
        this.setVisible(true);

        JLabel label = new JLabel("欢迎来到狂神说Java系列");

        this.add(label);

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

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

3.2 弹窗

示例一：

package com.zach.lesson04;

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

//主窗口
public class DialogDemo extends JFrame {

    public DialogDemo(){
        this.setVisible(true);
        this.setSize(700,500);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        //JFrame 放东西，容器
        Container container = this.getContentPane();
        //绝对布局
        container.setLayout(null);

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

        //点击这个按钮的时候，弹出一个弹窗
        button.addActionListener(new ActionListener() {//监听器
            @Override
            public void actionPerformed(ActionEvent e) {
                //弹窗
                new MyDialogDemo();
            }
        });
        container.add(button);
    }

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

//弹窗的窗口
class MyDialogDemo extends JDialog{
    public MyDialogDemo() {
        this.setVisible(true);
        this.setBounds(100,100,500,500);
//        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

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

        container.add(new Label("秦老师带你学Java"));
    }
}

3.3 标签

label
示例一：

	new JLabel("xxx");

图标Icon
示例一：

package com.zach.lesson04;

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

//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(){
        IconDemo iconDemo = new IconDemo(30,30);
        //图标放在标签，也可以放在按钮上！
        JLabel label = new JLabel("icontest", iconDemo, SwingConstants.CENTER);

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

        this.pack();
        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,height);
    }

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

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

图片Icon
示例一：

package com.zach.lesson04;

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);//命名不要冲突了
        label.setIcon(imageIcon);
        label.setHorizontalAlignment(SwingConstants.CENTER);

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

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

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

3.4 面板

JPanel
示例一：

package com.zach.lesson05;

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

public class JPanelDemo extends JFrame {

    public JPanelDemo() {
        Container container = this.getContentPane();

        container.setLayout(new GridLayout(2,1,10,10));//后湖面参数的意思：间距

        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"));

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

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

    }

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

JScrollPanel
示例一：

package com.zach.lesson05;

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

public class JScrollDemo extends JFrame {

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

        //文本
        JTextArea jTextArea = new JTextArea(20,50);//可以换行的
        jTextArea.setText("欢迎学习狂神说Java");

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

        this.setVisible(true);
        this.setBounds(100,100,300,350);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

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

3.5 按钮

图片按钮
示例一：

package com.zach.lesson05;

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

public class JButtonDemo01 extends JFrame {

    public JButtonDemo01() {
        Container container = this.getContentPane();
        //将一个图片变为图标
        URL resource = JButtonDemo01.class.getResource("tx.jpg");//图片需要从外部移动至lesson05文件夹内
        Icon icon = new ImageIcon(resource);

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

        //add
        container.add(button);

        this.setVisible(true);
        this.setSize(500,300);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    }

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

单选按钮
示例一：

package com.zach.lesson05;

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

public class JButtonDemo02 extends JFrame {

    public JButtonDemo02() {
        Container container = this.getContentPane();
        //将一个图片变为图标
        URL resource = JButtonDemo02.class.getResource("tx.jpg");//图片需要从外部移动至lesson05文件夹内
        Icon icon = new ImageIcon(resource);

        //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，分组，一个组中只能选择一个（不分组则可以多选）
        ButtonGroup buttonGroup = new ButtonGroup();
        buttonGroup.add(radioButton1);
        buttonGroup.add(radioButton2);
        buttonGroup.add(radioButton3);

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

        this.setVisible(true);
        this.setSize(500,300);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    }

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

复选按钮
示例一：

package com.zach.lesson05;

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

public class JButtonDemo03 extends JFrame {

    public JButtonDemo03() {
        Container container = this.getContentPane();
        //将一个图片变为图标
        URL resource = JButtonDemo03.class.getResource("tx.jpg");//图片需要从外部移动至lesson05文件夹内
        Icon icon = new ImageIcon(resource);

        //多选框
        JCheckBox checkBox01 = new JCheckBox("checkBox01");
        JCheckBox checkBox02 = new JCheckBox("checkBox02");

        container.add(checkBox01,BorderLayout.NORTH);
        container.add(checkBox02,BorderLayout.SOUTH);

        this.setVisible(true);
        this.setSize(500,300);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    }

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

3.6 列表

下拉框
示例一：

package com.zach.lesson06;

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

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

        JComboBox status = new JComboBox();

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

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

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

列表框
示例一：

package com.zach.lesson06;

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

public class TestComboboxDemo02 extends JFrame {
    public TestComboboxDemo02() {
        Container container = this.getContentPane();

        //生成列表的内容
//        String[] contents = {"1","2","3"};

        Vector contents = new Vector();
        //列表中需要放入内容
        JList jList = new JList(contents);

        contents.add("zhang san");
        contents.add("li si");
        contents.add("wang wu");

        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
示例一：

package com.zach.lesson06;

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

public class TestDemo01 extends JFrame {
    public TestDemo01() {
        Container container = this.getContentPane();
//        container.setLayout(null);

        JTextField jTextField1 = new JTextField("Hello");
        JTextField jTextField2 = new JTextField("World");

        container.add(jTextField1,BorderLayout.NORTH);
        container.add(jTextField2,BorderLayout.SOUTH);

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

    public static void main(String[] args) {
        new TestDemo01();
    }
}

密码框
示例一：

package com.zach.lesson06;

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

public class TestDemo02 extends JFrame {
    public TestDemo02() {
        Container container = this.getContentPane();

        //面板

        JPasswordField jPasswordField = new JPasswordField();//***
        jPasswordField.setEchoChar('艹');

        container.add(jPasswordField);

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

    public static void main(String[] args) {
        new TestDemo02();
    }
}

文本域
示例一：

package com.zach.lesson05;

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

public class TestDemo03 extends JFrame {

    public TestDemo03() {
        Container container = this.getContentPane();

        //文本
        JTextArea jTextArea = new JTextArea(20,50);//可以换行的
        jTextArea.setText("欢迎学习狂神说Java");

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

        this.setVisible(true);
        this.setBounds(100,100,300,350);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

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

—————— THE END ——————

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