What is the best way of using Arrays.asList() to initialize a List [duplicate]

Question

I use this below code. Both are working fine in my application.

Case 1.

List<String> coreModules =     new ArrayList<String>(Arrays.asList(         "TOOLBAR_TO_DO_LIST",         "TOOLBAR_PROPERTY",         "TOOLBAR_PEOPLE",         "TOOLBAR_INSURANCE",         "TOOLBAR_BATCH",         "TOOLBAR_INFORMATION_REFERENCE",         "TOOLBAR_LR_PROPERTY",         "TOOLBAR_CASE_FOLDER",         "TOOLBAR_INSPECTION_RESULT",         "TOOLBAR_MY_OFFICE")); 

Case 2.

List<String> coreModules =     Arrays.asList(         "TOOLBAR_TO_DO_LIST",         "TOOLBAR_PROPERTY",         "TOOLBAR_PEOPLE",         "TOOLBAR_INSURANCE",         "TOOLBAR_BATCH",         "TOOLBAR_INFORMATION_REFERENCE",         "TOOLBAR_LR_PROPERTY",         "TOOLBAR_CASE_FOLDER",         "TOOLBAR_INSPECTION_RESULT",         "TOOLBAR_MY_OFFICE"); 

But I have some questions:

1. Which one is better one performance-wise?
2. In which case prefer Case 2?

Answer 1

Case 2 is better performance-wise BUT: it returns a List with an immutable size. Meaning you cannot add/remove elements to/from it:

Returns a fixed-size list backed by the specified array. (Changes to the returned list "write through" to the array.)

Arrays#asList