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Java Swing - 如何对BorderLayout使用PAGE_START和LINE_END

layout 【layout】
我们想知道如何对BorderLayout使用PAGE_START和LINE_END。
代码展示 运行结果 
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.GridLayout;

import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;

public class Main {

  public static void main(String[] args) {
    JPanel gui = new JPanel(new BorderLayout(5, 5));

    int sz = 4;
    Container content = new JPanel(new GridLayout(sz, 0, 2, 2));
    for (int f = 0; f < sz * sz; f++) {
      content.add(new JButton());
    }
    gui.add(content, BorderLayout.CENTER);

    Container info = new JPanel(new FlowLayout(FlowLayout.CENTER, 50, 5));
    info.add(new JLabel("Flow"));
    info.add(new JLabel("Layout"));
    gui.add(info, BorderLayout.PAGE_START);

    gui.add(new JLabel("Label"), BorderLayout.LINE_END);

    JOptionPane.showMessageDialog(null, gui);
  }
}