Java-preliminary Understanding-Common Object API (Collection framework-method values demo)

One.

And then demonstrate a simple method. Now there is a need, name, other not. Some people say that it is OK to get getvalue directly. But there are more values here.

Value is values, S is a lot. Why isn't the set returned here? The keys are unique, and the values are not necessarily unique, so take a look at the faces here.

It is more convenient, but the return is not set, but collection.

Java-preliminary Understanding-Common Object API (Collection framework-method values demo)