How to find the index of an element in an int array?

Question

How can I find an index of a certain value in a Java array of type int?

I tried using Arrays.binarySearch on my unsorted array, it only som

Answer 1

In case anyone is still looking for the answer-

1. You can use ArrayUtils.indexOf() from the [Apache Commons Library][1].

2. If you are using Java 8 you can also use the Strean API:

   public static int indexOf(int[] array, int valueToFind) {
       if (array == null) {
           return -1;
       }
       return IntStream.range(0, array.length)
               .filter(i -> valueToFind == array[i])
               .findFirst()
               .orElse(-1);
   }
   

   [1]: https://commons.apache.org/proper/commons-lang/javadocs/api-3.1/org/apache/commons/lang3/ArrayUtils.html#indexOf(int[],%20int)