Empty JPanel not positioning correctly in relation to other JPanels

I am using swing to build a GUI with 4 JPanels inside a JPanel using the BorderLayout manager:

  1. A row of labels
  2. A column of JButtons
  3. A display area (it is a class that extends JPanel and has nothing added to it and is used as a drawing area)
  4. Another column of buttons

My code looks like this:

    JPanel middle = new JPanel();
    middle.setLayout(new BorderLayout());
    middle.add(midLabels,BorderLayout.NORTH);
    middle.add(pickupButtons,BorderLayout.WEST);
    middle.add(simulation,BorderLayout.CENTER);
    middle.add(dropButtons,BorderLayout.EAST);

The simulation panel is just an extended JPanel that overrides paintComponent to draw an image. The problem is, the simulation area is on the left and not in the middle:

The wrong layout

What I actually want is:

enter image description here

Edit, here is an example, do I need to use a different layout manager to get the empty JPanel positioned correctly?:

import java.awt.*;
import javax.swing.*;
public class Test extends JFrame {  
    final static int MAXFLOORS = 8;
    public Test() {
        setLayout(new BorderLayout());
        setTitle("Simulator");
        setVisible(true);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setSize(500, 500);

        JPanel simulation = new JPanel();
        JPanel dropButtons = new JPanel();
        JPanel pickupButtons = new JPanel();

        pickupButtons.setLayout(new GridLayout(MAXFLOORS, 1));
        dropButtons.setLayout(new GridLayout(MAXFLOORS, 1));
        setLayout(new BorderLayout());      
        add(simulation,BorderLayout.CENTER);
        add(dropButtons,BorderLayout.EAST);
        add(pickupButtons,BorderLayout.WEST);

        for (int i = MAXFLOORS; i != 0; i--) {
            JButton pb = new JButton("F" + i);
            dropButtons.add(pb);

            JButton db = new JButton("F" + i);
            dropButtons.add(db);
        }       
        repaint();
    }
    public static void main(String[] args) {
        new Test();
    }
}
Answer:1

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