how can i decrease the size of image?

Java Code:

 
import java.awt.*;
import javax.swing.*;
public class addImage extends JFrame {
        private ImageIcon img1;
        private JLabel label1;
        private ImageIcon img2;
        private JLabel label2;
                
        addImage(){
                img1 = new ImageIcon(getClass().getResource("Image/1.jpg"));
                label1 = new JLabel(img1);
                add(label1).setSize(100, 100);
                
                System.out.println();
                
                img2 = new ImageIcon(getClass().getResource("Image/2.jpg"));
                label2 = new JLabel(img2);
                add(label2).setSize(50, 50);
                
        }
        
        public static void main(String[] args) {
                addImage ai = new addImage();
                ai.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                ai.setVisible(true);
                ai.pack();
                ai.setTitle("Image Program");
        }

}

i want to decrease the size of image 2 but code on line 18 is not working why????

i have attached the output kindly find it.