Java Swing - 如何創(chuàng)建JPanel實(shí)現(xiàn)Scrollable

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import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Rectangle;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.Scrollable;
public class Main {
  public static void main(String args[]) {
    JPanel container = new ScrollablePanel();
    container.setLayout(new FlowLayout(FlowLayout.CENTER, 0, 0));
    for (int i = 0; i < 20; ++i) {
      JPanel p = new JPanel();
      p.setPreferredSize(new Dimension(50, 50));
      p.add(new JLabel("" + i));
      container.add(p);
    }
    JScrollPane scroll = new JScrollPane(container);
    scroll.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
    scroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
    JFrame f = new JFrame();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.getContentPane().add(scroll);
    f.pack();
    f.setSize(250, 300);
    f.setVisible(true);
  }
}
 
 
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