标签 （图标、图片）

label

图标ICON

package com.wtdm.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(){}
    public IconDemo(int width,int height){
        this.width=width;
        this.height = height;
    }
    public void init(){
        IconDemo iconDemo = new IconDemo(15,15);
//        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.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

package com.wtdm.lesson04;
import javax.swing.*;
import java.awt.*;
import java.net.URL;
public class ImageIconDemo extends JFrame {
    public ImageIconDemo(){
        //获取图片地址
        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 container = getContentPane();
        container.add(label);
        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

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