Count different values in array in Java

Question

I\'m writing a code where I have an int[a] and the method should return the number of unique values. Example: {1} = 0 different values, {3,3,3} = 0 different values, {1,2} = 2 d

Answer 1

Use a set to remove duplicates

 public static int differentValuesUnsorted(int[] a) {
     if (a.length < 2) {
         return 0;
     }

     Set uniques = new HashSet<>(a);
     return singleUnique.size();
 }