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

Try this:

import java.util.ArrayList;
public class DifferentValues {

 public static void main(String[] args)
  {
    int[] a ={1, 2, 3, 1};
    System.out.println(differentValuesUnsorted(a));
  }

 public static int differentValuesUnsorted(int[] a)
 {
   ArrayList ArrUnique = new ArrayList();
   int values=0;      //values of different numbers
   for (int num : a) {
       if (!ArrUnique.contains(num)) ArrUnique.add(num);
   }
   values = ArrUnique.size();
   if (values == 1) values = 0;       
   return values;
 }
}

input:{1,1,1,1,1} - output: 0
input:{1,2,3,1} - output: 3