package com.test;/** * 单例模式 *  * @author Administrator * */public class Hand {    // 内部类     private static Hand hand=null;         public static class HandHeet{         public final static Hand HAND=new Hand();     }         private Hand(){         System.out.println("实例化");     }              public static void show(){         System.out.println("Hello");     }         public static Hand getHand(){         return HandHeet.HAND;     }    // 懒汉模式//    private static Hand hand = null;////    private Hand() {//        System.out.println("实例化");//    }////    public static void show() {//        System.out.println("Hello");////    }////    public static Hand getHand() {//        if (hand == null) {//            hand= new Hand();//            return hand;//        }//        return hand;//    }    // 饿汉模式//    private static Hand hand = new Hand();////    private Hand() {//        System.out.println("实例化");//    }//    //    public static void show() {//        System.out.println("Hello");////    }//    public static Hand getHand() {//        return hand;//    }}