[Java知识库]Java的GUI编程---Swing介绍

Swing

窗口，面板

package com.akita.lesson03;

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

public class JFrameDemo02 {
    public static void main(String[] args) {
        new MyJFrame02().init();
    }
}

class MyJFrame02 extends JFrame {
    public void init() {
        this.setBounds(200, 200, 500, 500);
        //获得一个容器，只有这样设置颜色才会生效
        Container contentPane = this.getContentPane();
        contentPane.setBackground(Color.CYAN);

        //设置文字
        JLabel jLabel = new JLabel("akita");
        this.add(jLabel);

        //让文本标签居中
        jLabel.setHorizontalAlignment(SwingConstants.CENTER);

        setVisible(true);
    }
}

弹窗

package com.akita.lesson03;

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.setSize(500, 350);
        this.setLocation(300, 300);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

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

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

        //按钮
        JButton jButton = new JButton("点击弹出对话框");
        jButton.setBounds(30, 30, 200, 50);
        //点击这个按钮弹出一个弹窗
        jButton.addActionListener(new ActionListener() {  //监听器
            @Override
            public void actionPerformed(ActionEvent e) {
                //弹窗
                new MyDialogDD();
            }
        });
        contentPane.add(jButton);
        
        this.setVisible(true);
    }

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

//弹窗的窗口
class MyDialogDD extends JDialog {
    public MyDialogDD() {
        this.setBounds(100, 100, 500, 500);
        Container contentPane = this.getContentPane();
        contentPane.setLayout(null);
        Label akita = new Label("akita");
        akita.setSize(50, 50);
        contentPane.add(akita);
        this.setVisible(true);
    }
}

标签

• JLabel

JLabel jLabel = new JLabel("标签");

• Icon

package com.akita.lesson03;

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

//图标是一个接口，需要实现类，并继承JFrame
public class IconDemo extends JFrame implements Icon {

    private int width;
    private int height;

    public IconDemo() {

    }

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

    public void init() {
        IconDemo iconDemo = new IconDemo(15, 15);
        //图标要放在标签上
        JLabel jLabel = new JLabel("icon_test", iconDemo, SwingConstants.CENTER);
        Container contentPane = getContentPane();
        contentPane.add(jLabel);

        this.setBounds(200,200,400,340);
        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;
    }
}

• ImageIcon

package com.akita.lesson03;

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

public class ImageIconDemo extends JFrame {

    public ImageIconDemo() {
        JLabel akita = new JLabel("akita");
        //获取图片地址
        URL url = ImageIconDemo.class.getResource("icon.png");

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

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

        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setBounds(200, 200, 500, 500);
    }

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

面板

按钮

• 单选按钮
• 复选按钮

列表

文本框