Swing component Icon

Using pictures as icons

package Swing;

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

public class ImageIconDemo extends JFrame{
    
    public static void main(String[] args) {
    
        new ImageIconDemo();
    }
// Use pictures as icons 
    public ImageIconDemo() {
    
        // Create one called ImageIcon The label of 
        JLabel label = new JLabel("ImageIcon");
        // Get the address of the picture 
        URL url = ImageIconDemo.class.getResource("fj.jpg");
        // Go picture properties to imageIcon On 
        ImageIcon imageIcon = new ImageIcon(url);
        // Set the picture on the label 
        label.setIcon(imageIcon);
        // Center the icon 
       label.setHorizontalAlignment(SwingConstants.CENTER);
       // Create a container and add panels to it 
       Container container=getContentPane();
       // Add labels to containers 
       container.add(label);

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

Use the figure drawn by the brush as the icon

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

// Icon , Need to implement class ,Frame  Inherit 
public class IconDemo extends JFrame implements Icon {
    
    private int width;
    private int height;

    public static void main(String[] args) {
    
// Both calling methods can 
      // IconDemo iconDemo = new IconDemo(15,15);
       // iconDemo.init();
        new IconDemo().init();
    }

    public IconDemo() throws HeadlessException {
    }

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

    public void init(){
    
        IconDemo iconDemo = new IconDemo(15, 15);
        // Icons can be placed on labels or buttons 
        JLabel label = new JLabel("iconTest", iconDemo, SwingConstants.CENTER);
        Container container = getContentPane();
        container.add(label);

        setBounds(100,200,500,500);
        this.setVisible(true);
   this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    @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;
    }
}