Java Swing - 如何添加JLabel到JScrollPane，滚动并查看隐藏的部分

 
import java.awt.Dimension;

import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;

public class Main {
  public static void main(String[] args) {
    JLabel image = new JLabel("w3cschool.cn");
    image.setPreferredSize(new Dimension(2000,2000));
    JScrollPane js = new JScrollPane(image);
    
    js.setPreferredSize(new Dimension(200,200));
    
    JOptionPane.showMessageDialog(null, js);
    
  }
}