Generics is the most profound of changes envisaged in Tiger. Greg Travis has this nice preview on it.
In summary Generics offer the following advantages as per Greg:
- Better compile-time type checking: With generics, the type casting is implicit in the instantiation you are using, and it’s done at compile-time. By using a particular instantiation, you are in essence saying that this Object is really going to be a String, and the compiler will verify whether this is consistent with everything else going on in the program.
- Convenience: Casting can be irritating, it also makes code harder to read, since it can turn a simple assignment (or parameter-pass) into a more complicated expression. With generics, casting just goes away.