Code of layout issue - StackOverflow

test1.java

package org.dchan.context;

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JButton;

public class test1 extends JFrame {

	JPanel contentPane;

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					test1 frame = new test1();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the frame.
	 */
	public test1() {
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 450, 300);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		contentPane.setLayout(new BorderLayout(0, 0));
		setContentPane(contentPane);

		JButton btnView = new JButton("View2");
		contentPane.add(btnView, BorderLayout.CENTER);
		btnView.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				contentPane.removeAll();
				contentPane.invalidate();
				test2 obj = new test2();
				obj.contentPane.setVisible(true);
				contentPane.add(obj.contentPane);
				((JPanel) contentPane).revalidate();
				contentPane.repaint();
			}
		});
	}

}

test2.java

package org.dchan.context;

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

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

public class test2 extends JFrame {

	JPanel contentPane;

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {

		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					test2 frame = new test2();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the frame.
	 */
	public test2() {
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 450, 300);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		contentPane.setLayout(new BorderLayout(0, 0));

		JLabel lblThisIsView = new JLabel("this is view 2!");
		lblThisIsView.setBounds(178, 107, 110, 14);
		contentPane.add(lblThisIsView,BorderLayout.CENTER);

		JButton btnView = new JButton("View 1!");
		btnView.setBounds(168, 161, 89, 23);
		contentPane.add(btnView,BorderLayout.SOUTH);

		btnView.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				contentPane.removeAll();
				contentPane.invalidate();
				test1 obj = new test1();
				obj.contentPane.setVisible(true);
				contentPane.add(obj.contentPane);
				((JPanel) contentPane).revalidate();
				contentPane.repaint();
			}
		});
	}
}