JAVA

java.swing.image

import javax.swing.ImageIcon; //導入方法依賴的package包/類
private void setIconButtons()

    {
        homeIcon = new ImageIcon("icon/home.png");
        Image icon = homeIcon.getImage().getScaledInstance(20, 20, Image.SCALE_SMOOTH);
        homeIcon.setImage(icon);
        home.setIcon(homeIcon);
        
        nextIcon = new ImageIcon("icon/next.png");
        icon = nextIcon.getImage().getScaledInstance(20, 20, Image.SCALE_SMOOTH);
        nextIcon.setImage(icon);
        next.setIcon(nextIcon);
        
        backIcon = new ImageIcon("icon/back.png");
        icon = backIcon.getImage().getScaledInstance(20, 20, Image.SCALE_SMOOTH);
        backIcon.setImage(icon);
        back.setIcon(backIcon);
        
        /*endIcon = new ImageIcon("icon/end.png");
        icon = endIcon.getImage().getScaledInstance(20, 20, Image.SCALE_SMOOTH);
        endIcon.setImage(icon);
        end.setIcon(endIcon);*/
    }

java swing pic

BufferedImage myPicture = ImageIO.read(new File("path-to-file"));
JLabel picLabel = new JLabel(new ImageIcon(myPicture));
add(picLabel);

java swing pic

import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.JPanel;

public class ImagePanel extends JPanel{

    private BufferedImage image;

    public ImagePanel() {
       try {                
          image = ImageIO.read(new File("image name and path"));
       } catch (IOException ex) {
            // handle exception...
       }
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.drawImage(image, 0, 0, this); // see javadoc for more info on the parameters            
    }

}