單例,懶漢模式

姜敞 7-3 11:28:42 public class Singleton { private static volatile Singleton sSingleton; private Singleton(){ } public Singleton getInstance(){ if(sSingleton == null){ synchronized (Singleton.class) { if(sSingleton == null){ sSingleton = new Singleton(); } } } return sSingleton; } } private static volatile Singleton sSingleton 就是這個成員變量用的時候才初始化
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