Java generic method declaration [duplicate]

Answer 1

Using the first method declaration will not allow you to add anything new to the list. For example this will not compile.

public static void someMethod(List numberList, Number number) {
    numberList.add(number);
}

while the second allows you to do this:

public static  void someMethod(List numberList, T number) {
    numberList.add(number);
}