GridLayout是一种非常简单的布局，它的每个组件的大小都相等。这里不许多说，直接上代码和图片说明

/*
 * GridLayoutDemo.java requires no other files.
 */
 

import java.awt.Container;

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Insets;


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

 
public class GridLayouts extends JFrame{
	
	private JButton btn1 = new JButton("Button1");
	private JButton btn2 = new JButton("Button2");
	private JButton btn3 = new JButton("Button3 what a fine day");
	private JButton btn4 = new JButton("Button4 what a fine da");
	private JButton btn5 = new JButton("Button5 what a fine d");
	private JButton btn6 = new JButton("Button6 what a fines");
	
	GridLayouts()
	{
		super();
		initComponent();
		
	}
	private void initComponent()
	{
		Container container = this.getContentPane();
		container.setLayout(new GridLayout(2,3));

		container.add(btn1);
		
		container.add(btn2);
		
		container.add(btn3);

		container.add(btn4);

		container.add(btn5);

		container.add(btn6);
	}
	
	public static void main(String[] args)
	{
		GridLayouts frame = new GridLayouts();
		frame.pack();
		frame.setVisible(true);
	}
	
}

java布局之GridBagLayout