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Java Swing - 如何在BorderLayout的CENTER中使用JScrollpane

jscrollpane 【jscrollpane】
我们想知道如何在BorderLayout的CENTER中使用JScrollpane。
代码展示 运行结果 
import java.awt.BorderLayout;
import java.awt.FlowLayout;

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

public class Main extends JFrame {
  public static void main(String[] args) {
    new Main().go();
  }

  private void go() {
    setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    JPanel topPanel = new JPanel();
    topPanel.add(new JLabel("boo"));

    JPanel mainPanel = new JPanel(new BorderLayout());
    JPanel mainInnerPanel = makeMainInnerPanel();

    JScrollPane scrollPane = new JScrollPane(mainInnerPanel);
    mainPanel.add(scrollPane);
    add(topPanel, BorderLayout.NORTH);
    add(mainPanel, BorderLayout.CENTER);

    pack();
    setVisible(true);
  }

  private JPanel makeMainInnerPanel() {
    JPanel row1 = makeHorizontalPanel("one", "two", "three", "four", "five");
    JPanel row2 = makeHorizontalPanel("six", "seven", "eight");
    JPanel row3 = makeHorizontalPanel("nine", "ten", "eleven");
    JPanel m = new JPanel(new FlowLayout(FlowLayout.LEFT));
    m.add(row1);
    m.add(row2);
    m.add(row3);
    return m;
  }

  private JPanel makeHorizontalPanel(String... labelValues) {
    JPanel panel = new JPanel(new FlowLayout(FlowLayout.LEFT));
    for (String s : labelValues) {
      JLabel label = new JLabel(s);
      panel.add(label);
    }
    return panel;
  }
}