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Java Swing - 如何把JScrollPane放在JSplitPane中

jscrollpane 【jscrollpane】
我们想知道如何把JScrollPane放在JSplitPane中。
代码展示 运行结果 
import java.awt.BorderLayout;
import java.awt.Dimension;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;

public class Main extends JFrame {

  public Main() {
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setSize(400, 400);
    JSplitPane split = new JSplitPane(JSplitPane.VERTICAL_SPLIT);
    split.setDividerLocation(200);
    add(split);

    JPanel panel1 = new JPanel();
    panel1.setLayout(new BorderLayout());
    panel1.add(new JLabel("top panel"), BorderLayout.NORTH);

    JPanel myDrawPanel = new JPanel();
    myDrawPanel.setPreferredSize(new Dimension(100, 100));
    myDrawPanel.add(new JLabel("draw panel here!"));
    panel1.add(new JScrollPane(myDrawPanel), BorderLayout.CENTER);

    split.setTopComponent(panel1);

    JPanel panel2 = new JPanel();
    panel2.add(new JLabel("bottom panel"));
    split.setBottomComponent(panel2);
    setVisible(true);
  }
  public static void main(String[] args) {
    new Main();
  }
}