Java AWT BorderLayout BorderLayout.LINE_START

import java.awt.BorderLayout;
import java.awt.Color;

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


public class Main {
   public static void main(String[] args) {
      JFrame frame = new JFrame();
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setTitle("My First Frame");
      //  w ww .  ja v  a 2 s .  c o  m
      JPanel bluePanel = new JPanel();
      JPanel redPanel = new JPanel();
      
      JLabel label = new JLabel("<-- pick your side -->");
      
      frame.getContentPane().add(label, BorderLayout.CENTER);
      
      bluePanel.setBackground(Color.blue);
      redPanel.setBackground(Color.red);
      
      frame.getContentPane().add(bluePanel, BorderLayout.LINE_START);
      frame.getContentPane().add(redPanel, BorderLayout.LINE_END);
      
      JButton blueButton = new JButton("PICK BLUE TEAM");
      JButton redButton = new JButton("PICK RED TEAM");
      
      bluePanel.add(blueButton);
      redPanel.add(redButton);
      
      frame.pack();
      frame.setVisible(true);
   }
}