Java中的单例模式实现

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发布于 2022-09-14 16:03:34

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发布于 2022-09-14 16:03:34

文章被收录于专栏：生如夏花绚烂

饿汉式

class Bank{
   private Bank(){}
     
     private static Bank instance = new Bank();
     
     public static Bank getInstance(){
         return instance;
     }
        
}

懒汉式

class Order{
    private Order(){}
        
        private static Order instance = null;
        
        public static  Order getInstance(){
           if(instance == null){
                synchronized(Order.class){
                   if(instance == null){
                    instance = new Order();
                  }
                }
             }
             return instance;
        }
}

synchronized 解决线程安全问题

饿汉式与懒汉式