Java泛型-类型擦除后的方法

Question

How will the following method look after applying type erasure?

static<T> void InsertAt0(List<T> mylist, T element) {
    mylist.add(0, element);
}

will T be replaced with Object ? or maybe type-erasure is only about generics classes?

Answer 1

Just remove all of the <T> s, and then replace any T with Object:

static void InsertAt0(List mylist, Object element) {
   mylist.add(0, element);
}

Note that mylist above has been erased to its raw type equivalent: List<T> became just List .

If you had specified a wildcard bound for T, like <T extends Number> , then you would replace T with that bound instead of Object:

static void InsertAt0(List mylist, Number element) {
                                   ^^^^^^