Java窗体中按钮布局问题

在Java窗体中，有时需要对按钮的设置进行布局，这时使用GridLayout(x, y)会很方便，意思是把窗口划分为x行y列的小格子，在add的时候就是一行一行的填充，这样可以是按钮得到标准化布局

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.Toolkit;

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

public class test_for_blog extends JFrame
{
/**
*
*/
private static final long serialVersionUID = 5136083409273453255L;

private static int JFwidth = 450;
private static int JFheight = 350;

JPanel panel = null;

JButton btnAdd = null;
JButton btnDelete = null;

public test_for_blog()
{
super("按钮添加测试");

panel = new JPanel();

btnAdd = new JButton("Add");
btnDelete = new JButton("Delete");

panel.setLayout( new GridLayout(1, 2) );
panel.add(btnAdd);
panel.add(btnDelete);
this.getContentPane().add(panel, BorderLayout.SOUTH);
}

public static void main(String[] args)
{
test_for_blog test = new test_for_blog();
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize(); //获取显示屏尺寸
test.setBounds((screenSize.width - JFwidth) / 2, (screenSize.height - JFheight) / 2, JFwidth, JFheight); //使程序窗口居中
test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //窗口设为可关闭
test.setResizable(false); //窗口设为不可调节大小
test.setVisible(true); //窗口设为可见
}
}