Java generic methods in generics classes

Question

If you create a generic class in Java (the class has generic type parameters), can you use generic methods (the method takes generic type parameters)?

Consider the f

Answer 1

This doesn't answer the fundamental question, but does address the issue of why makeSingletonList(...) compiles whilst doSomething(...) does not:

In an untyped implementation of MyGenericClass:

MyGenericClass untyped = new MyGenericClass();
List list = untyped.makeSingletonList("String");

...is equivalent to:

MyGenericClass untyped = new MyGenericClass();
List list = untyped.makeSingletonList("String");
List typedList = list;

This will compile (with several warnings), but is then open to runtime errors.

Indeed, this is also analogous to:

MyGenericClass untyped = new MyGenericClass();
List list = untyped.makeSingletonList("String"); // this compiles!!!
Integer a = list.get(0);

...which compiles but will throw a runtime ClassCastException when you try and get the String value out and cast it to an Integer.