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javacollectionsfastutil

Fixed size collection

I need to have a fixed size array with the length of 10, consisting of double values as they used as a record so this should have efficient structure.

I wonder if there is any fixed length collection in fastutil or simply I can use a double[10] array instead of fastutil?

Solution

  • Array is the way to go. If you must have a fixed size collection you can create one that is backed by array and its size can not be changed : 

    Integer[] ints = {0,1,2,3,4,5,6,7,8,9};
List<Integer> listBackedByArray = Arrays.asList(ints); //fixed size list
listBackedByArray.add(10);// will produce UnsupportedOperationException