Java generics: syntax clarification needed

Suppose i have a

List<Integer> l = new ArrayList<Integer>();

and would like to have this list reversed with the help of

public static List<Object> reverseList(List<Object> o);

Thought process here is that one day i may be dealing with Integers and another wi开发者_开发知识库th Doubles. Would be nice to have a generic method that is able to reverse my Lists

How should reverseList be declared for this to work? Please advise

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One way to declare it is

public static <T> List<T> reverseList(List<T> o) {
  ...
}

You might also want to take a look at Collections.reverse.

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You can do

public static <T extends Number> List<T> reverseList(List<T> o) {

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You can use this:

public static <T> List<T> reverse(List<T> in);