单例模式Singleton

package net.util;
/**
 * @项目名：spring2.5
 * @包名：net.util
 * @文件名：SingletonDemo.java
 * @日期：Jun 21, 2011 3:01:28 PM
 * @备注：单例模式
 * @作者：apple
 */
public class SingletonDemo {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub

		Singleton s=Singleton.getSingletonInstance();
		s.say();
	}

}

class Singleton{
	private Singleton(){}
	private static final Singleton s1=new Singleton();
	public static Singleton getSingletonInstance()
	{
		return s1; 
	}
	public void say(){
		System.out.println("说话");
	}
}