Private static <T> T cloneX (T x) - What does <T> mean here?

Question

In the above description, what is <T>

for?

I would like to know the difference between having <T>

and not having it? How does this affect the code?

+2

java_geek Apr 12 At 13:11

4 answers

cletus · Answer 1 · 2010-04-12T13:15:09+0000

<T>

here indicates that the type is implied from the arguments. So:

public static <T> List<T> createList(T... args) {
  List<T> ret = new ArrayList<T>(Arrays.asList(args));
}

:

List<String> list = createList("one", "two", "three");

or

List<Integer> list2 = createList(1, 2, 3);

oedo · Answer 2 · 2010-04-12T13:14:58+0000

it just means that you will get the same class from that method that you insert in order to store it as Object and you have to cast it all the time.

GaryF · Answer 3 · 2010-04-12T13:14:26+0000

<T>

is the type of the parameter that you pass to this generic method.

Andrey · Answer 4 · 2010-04-12T13:15:49+0000

This is a general parameter. If you write then

string s = ...;
clone(s); // will be expanded to string clone(string x)