CODEWITHSUNDEEP
java
user496949
user496949

Reputation: 86145

How to inherit from a base generic class

Have a base genric class like ClassBase<T>

I found I can use

ClassDerived extends ClassBase

or 

ClassDerived<T> extends Classbase<T>

So basically it means I can remove generics in the derived class, is that right?

Upvotes: 2

Views: 1307

Answers (2)

davmac
davmac

Reputation: 20651

You can extend the raw version of a generic class, that's correct. Of course your second example:

ClassDerived<T> extends Classbase

... actually re-introduces a type parameter.

Upvotes: 1

Ted Hopp
Ted Hopp

Reputation: 234847

Since all generic type information is erased in the compilation process, of course you can do that. However, most compilers will generate a warning unless the warning is turned off or suppressed. For instance, if I write class Foo extends HashMap {}, Eclipse reports: "HashMap is a raw type. References to generic type HashMap should be parameterized"

Upvotes: 2

Related Questions