2.将5个按钮添加到BorderLayout的五个区（布局管理器：BorderLayout）

效果：

package com.lvshitech.gui;

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Container;
import javax.swing.JApplet;

public class BorderLayoutDemo extends JApplet {
	private static final long serialVersionUID = 1L;
	public void init() {
		Container c = getContentPane();
		c.add(new Button("北North"), BorderLayout.NORTH);
		c.add(new Button("南South"), BorderLayout.SOUTH);
		c.add(new Button("东East"), BorderLayout.EAST);
		c.add(new Button("西West"), BorderLayout.WEST);
		c.add(new Button("中Center"), BorderLayout.CENTER);
	}
}