使用BorderLayout布局

package _5;

import java.awt.BorderLayout;

import javax.swing.JButton;

import javax.swing.JFrame;

public class BorderLayoutDemo extends JFrame {

private JButton north = new JButton("北");

private JButton south = new JButton("南");

private JButton east = new JButton("东");

private JButton west = new JButton("西");

private JButton center = new JButton("中");

public BorderLayoutDemo() {

setSize(300, 300);

setLocationRelativeTo(null);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

//设置布局方式为 BorderLayout

setLayout(new BorderLayout());

//添加按键,注意设置布局方式之后任何对

//组件进行设置的方法,如 setSize、setLocation 等都会失效

add(north, BorderLayout.NORTH);

add(south, BorderLayout.SOUTH);

add(east, BorderLayout.EAST);

add(west, BorderLayout.WEST);

add(center, BorderLayout.CENTER);

}

public static void main(String arg[]) {

BorderLayoutDemo frame = new BorderLayoutDemo();

frame.setVisible(true);

}

}