The Java language spec lists 10 Java constructor types, including default, no-args, canonical, private parameterized, generic, overloaded and anonymous.

Oracle has been working to bring value types to the Java language and runtime. We present an update on the current status of this work.

I’ll also introduce raw types and discuss the instances when you might choose to use raw types rather than generics, along with the risks of doing so. Generics in Java programming Why use generics?

Project Valhalla has posted a major update and has announced some initial, very early-stage design concepts for value types in the JVM.

Using generics results in more robust code and avoids ClassCastExceptions in your Java programs. This in-depth tutorial introduces you to generics and their types and methods.