摘要： //SingletonwithpublicfinalfieldpublicclassElvis{publicstaticfinalElvisINSTANCE=newElvis();privateElvis(){...}publicvoidleaveTheBuilding(){...}}//singletonwithstaticfactorypublicclassElvis{privatestaticfinalElvisINSTANCE=newElvis();privateElvis(){...}publicstaticElvisgetInstance(){returnINSTANCE;}pub 阅读全文