In your second case when you do: public void processA(A a) What do you mean by A? Does it mean A<String> or A<List<String>> or what? You might not be using anything related to type of A, but hey the compiler doesn’t know this fact. To compiler, just A is a sign of panic. In your … Read more
Raw Types and Unbounded Wildcards None of the previous answers have really addressed why you should prefer Class<?> over Class, as on the face of it, the former seems to offer no more information than the latter. The reason is that, the raw type, i.e. Class, prevents the compiler from making generic type checks. That … Read more
You can use the @SuppressWarnings(“unchecked”) which is supported by both the eclipse compiler and javac. But remember the @SuppressWarnings annotation is used by your compiler which can have its own values. The JLS only forces the compiler to understand the values “unchecked” and “deprecated” (for now). Compiler vendors should document the warning names they support … Read more
What is a raw type? The Java Language Specification defines a raw type as follows: JLS 4.8 Raw Types A raw type is defined to be one of: The reference type that is formed by taking the name of a generic type declaration without an accompanying type argument list. An array type whose element type … Read more