摘要：单例模式：why?创建对象的时间、内存消耗、GC及停顿时间恶汉式：(缺点是实例创建没法延迟加载)publicclassSingleton{privateSingleton(){}privatestaticSingletoninstance=newSingleton();publicstaticSingletongetInstance(){returninstance;}}懒汉式：(缺点：多线程下性能问题)publicclassLazySingleton{privateLazySingleton(){}privatestaticLazySingletoninstance=null;publics 阅读全文