黑马程序员——单例模式的两种实现方法

------Java培训、Android培训、iOS培训、.Net培训、期待与您交流！ -------

 

 

//先初始化对象，也称为：饿汉式

class Single

{

        private static Single s = new Single();

        private Single(){}

        public static Single getInstance()

        {

                return s;

        }

}

 

//对象是方法被调用时才初始化，也叫作对象的延时加载。也叫：懒汉式

class Single

{

        private static Single s = null;

        private Single(){}

        public static Single getInstance()

        {

                if(s==null)

                        s = new Single();

                return s;

        }

}