Java - Casting to E[]

Question

When I cast to E[] (the class parameter), it requires me to add

@SuppressWarnings("unchecked")

For example:

E[] anArray = (E[]) new Object[10];

Should I be doing something different, or is it supposed to be like this?

Thanks

Answer 1

It is correct. Imagine:

Object[] o = new Object[10];
o[0] = new A(); // A is not a subclass of E
E[] e = o; // Now you have broken the type system: e[0] references something that is not an E.

The way it works, you have to explicitly cast in order to make the compiler ignore this possibility.