Count occurrence GFG

 package com.company;

public class countOccurrence {
    //    Number of times an element occur in an array
//    1. Naive solution
    public static int getOccurrence(int[] arr, int x) {
        int n = arr.length;
        int count = 0;
        for (int i = 0; i < n; i++) {
            if (arr[i] == x) {
                count++;
            }
        }
        return count;
    }

    //    2. Efficient solution
    public static int firstIndex(int[] arr, int x) {
        int n = arr.length;
//        Finding the index of first occurrence of an element
        int low = 0;
        int high = n - 1;
        while (low <= high) {
            int mid = (low + high) / 2;
            if (arr[mid] == x) {
                if (mid == 0 || arr[mid] != arr[mid - 1]) {
                    return mid;
                } else
                    high = mid - 1;
            } else if (arr[mid] > x) {
                high = mid - 1;
            } else
                low = mid + 1;
        }
        return -1;
    }
    public static int lastIndex(int[] arr, int x) {
        int n = arr.length;
        int low = 0; int high = n - 1;
        while(low <= high) {
            int mid = (low + high) / 2;
            if(arr[mid] == x) {
                if(mid == n - 1 || arr[mid + 1 ] != x) {
                    return mid;
                }
                else
                    low = mid + 1;
            }

            else if(arr[mid] > x) {
                high =mid - 1;
            }
            else
                low = mid + 1;
        }
        return -1;
    }

    // Calling the method
    public static int get(int[] arr, int x) {
        int n = arr.length;
        int count = 0;
        int a = getCount(arr, x);
        if (a == -1) {
            return 0;
        }
        for (int i = a; i < n - 1; i++) {
            if (arr[i] == arr[a]) {
                count++;
            }
        }
        return count;
    }
//Best solution using first occurrence and last occurrence of an element
    public static int getCount(int[] arr, int x) {
        int n = arr.length;
        int f = firstIndex(arr, x);
        if(f == -1){
            return 0;
        }

        return (lastIndex(arr, x) - f + 1);
     }
    public static void main(String[] args) {
        int[] array = {2, 5, 6, 6, 6, 7, 8};
        System.out.println(getCount(array, 68));

    }

}