How to inherit from a base generic class

Have a base genric class like ClassBase<T>

I found I can u开发者_运维问答se

ClassDerived extends ClassBase

or

ClassDerived<T> extends Classbase<T>

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

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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"

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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.