Java jpanel trait vertical

import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.GridLayout;

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

public class MainView extends JFrame {
	private Container c;

	public MainView() {
		super("Trait vertical");
		initialize();
	}

	private void initialize() {
		c = getContentPane();
		c.setLayout(new GridLayout(1, 2));
		JPanel panelLeft = new JPanel();
		panelLeft.setBorder(BorderFactory.createMatteBorder(0,0,0,1,Color.RED));
		panelLeft.add(new JLabel("Panneau de gauche"));
		panelLeft.setPreferredSize(new Dimension(200,100));
		c.add(panelLeft);
		JPanel panelRight = new JPanel();
		panelRight.add(new JLabel("Panneau de droite"));
		panelRight.setPreferredSize(new Dimension(200,100));
		c.add(panelRight);
	}

	public static void main(String[] args) {
		JFrame view = new MainView();
		view.pack();
		view.setVisible(true);
	}
}