Java Swing - 如何創(chuàng)建一個(gè)動(dòng)態(tài)大小的JScrollPane w/JPanel作為客戶端？

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import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import javax.swing.Box;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.KeyStroke;
public class Main extends JPanel {
   private static final Dimension THUMB_SIZE = new Dimension(170, 150);
   private Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();
   private JPanel thumbPanel = new JPanel(new GridLayout(0, 6, 5, 5));
   public Main() {
      JPanel holderPanel = new JPanel(new BorderLayout());
      holderPanel.add(thumbPanel, BorderLayout.NORTH);
      holderPanel.add(Box.createGlue(), BorderLayout.CENTER);
      setLayout(new BorderLayout());
      add(new JScrollPane(holderPanel), BorderLayout.CENTER);
   }
   public JMenuBar createMenuBar() {
      JMenuBar top_menu_bar = new JMenuBar();
 
 
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