Java Swing - 如何在JFrame的底部添加一个状态栏

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.border.CompoundBorder;
import javax.swing.border.EmptyBorder;
import javax.swing.border.LineBorder;

public class Main {

  public static void main(String[] args) {
    JPanel statusBar = new JPanel(new FlowLayout(FlowLayout.LEFT));
    statusBar.setBorder(new CompoundBorder(new LineBorder(Color.DARK_GRAY),
        new EmptyBorder(4, 4, 4, 4)));
    final JLabel status = new JLabel();
    statusBar.add(status);

    JLabel content = new JLabel("Content in the middle");
    content.setHorizontalAlignment(JLabel.CENTER);

    final JFrame frame = new JFrame("Test");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setLayout(new BorderLayout());
    frame.add(content);
    frame.add(statusBar, BorderLayout.SOUTH);

    frame.addComponentListener(new ComponentAdapter() {
      @Override
      public void componentResized(ComponentEvent e) {
        status.setText(frame.getWidth() + "x" + frame.getHeight());
      }
    });

    frame.setBounds(20,20,200,200);
    frame.setVisible(true);
  }

}