Java's convenient initialization method for HashSet in class definition

Sometimes when we are defining a class member, when this class member type is HashSet, we can not easily call the Add function to initialize, so we can use the following convenient method for initialization

1  Public classmytest{2     3      FinalHashset<string> set =NewHashset<string>() {4         {5Add ("a");6Add ("B");7Add ("C");8     9         }Ten     }; One      Public Static voidMain (string[] args) { AMyTest m =NewMyTest (); - System.out.println (m.set); -     } the}

Java's convenient initialization method for HashSet in class definition