Java programming

Write a function class Solution { public int solution(int[] A); } that, given an array A consisting of N integers, returns the biggest value X, which occurs in A exactly X times. If there is no such value, the function should return 0. Examples: 1. Given A = [3, 8, 2, 3, 3, 2), the function should return 3. The value 2 occurs exactly two times and the value 3 occurs exactly three times, so they both meet the task conditions. The value 8 occurs just once, thus it does not meet the task conditions. The maximum of 2 and 3 is 3. 2. Given A = [7, 1, 2, 8, 2], the function should return 2. The value 1 occurs exactly one time; the value 2 occurs exactly two times. 3. Given A = [3, 1,4,1,5), the function should return 0. There is no value which meets the task conditions. 4. Given A = [5, 5, 5, 5, 5), the function should return 5. Write an efficient algorithm for the following assumptions: N is an integer within the range [1..100,000); each element of array A is an integer within the range (1..1,000,000,000)