How to initialize a static array?

问题:

I have seen different approaches to define a static array in Java. Either:

String[] suit = new String[] {
  "spades", 
  "hearts", 
  "diamonds", 
  "clubs"  
};

...or only

String[] suit = {
  "spades", 
  "hearts", 
  "diamonds", 
  "clubs"  
};

or as a List

List suit = Arrays.asList(
  "spades", 
  "hearts", 
  "diamonds", 
  "clubs"  
);

Is there a difference (except for the List definition of course)?

What is the better way (performance wise)?

回答1:

If you are creating an array then there is no difference, however, the following is neater:

String[] suit = {
  "spades", 
  "hearts", 
  "diamonds", 
  "clubs"  
};

But, if you want to pass an array into a method you have to call it like this:

myMethod(new String[] {"spades", "hearts"});

myMethod({"spades", "hearts"}); //won't compile!

回答2:

Nope, no difference. It's just syntactic sugar. Arrays.asList(..) creates an additional list.