Java GUI Layout

getContentPane().setLayout(null);

package com.java.myapp;

import java.awt.EventQueue;

import javax.swing.JButton;
import javax.swing.JFrame;

public class MyForm extends JFrame {

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

	/**
	 * Create the frame.
	 */
	public MyForm() {
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 450, 300);
		setTitle("ThaiCreate.Com GUI Tutorial");
		
		getContentPane().setLayout(null);
		
		JButton btn1 = new JButton("Button 1");
		btn1.setBounds(41, 29, 89, 23);
		getContentPane().add(btn1);
		
		JButton btn2 = new JButton("Button 2");
		btn2.setBounds(126, 81, 89, 23);
		getContentPane().add(btn2);
		
		JButton btn3 = new JButton("Button 3");
		btn3.setBounds(193, 134, 89, 23);
		getContentPane().add(btn3);
		
		JButton btn4 = new JButton("Button 4");
		btn4.setBounds(298, 183, 89, 23);
		getContentPane().add(btn4);
		
		
	}
}

getContentPane().setLayout(new GridLayout(3, 2, 10, 10)); // 3x2

package com.java.myapp;

import java.awt.EventQueue;

import javax.swing.JButton;
import javax.swing.JFrame;
import java.awt.GridLayout;

public class MyForm extends JFrame {

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

	/**
	 * Create the frame.
	 */
	public MyForm() {
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 450, 300);
		setTitle("ThaiCreate.Com GUI Tutorial");
		
		getContentPane().setLayout(new GridLayout(3, 2, 10, 10)); // 3x2
		
		JButton	btn1 = new JButton("Button 1");
		getContentPane().add(btn1);

		JButton btn2 = new JButton("Button 2");
		getContentPane().add(btn2);

		JButton btn3 = new JButton("Button 3");
		getContentPane().add(btn3);

		JButton btn4 = new JButton("Button 4");
		getContentPane().add(btn4);

		JButton btn5 = new JButton("Button 5");
		getContentPane().add(btn5);

		JButton btn6 = new JButton("Button 6");
		getContentPane().add(btn6);

		JButton btn7 = new JButton("Button 7");
		getContentPane().add(btn7);

		JButton btn8 = new JButton("Button 8");
		getContentPane().add(btn8);
		
	}

}