单例模式

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####懒汉式单例模式最佳写法

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public class Singleton {
    private volatile static Singleton singleton;
        private Singleton(){};
        public static Singleton getSingleton(){
            if(singleton==null) {
                synchronized (Singleton.class) {
                if (singleton == null) {
                singleton = new Singleton();
                }
            }
        }
        return singleton;
    }
}