80. Remove Duplicates from Sorted Array II

Follow up for "Remove Duplicates":What if duplicates are allowed at most twice?
For example,Given sorted array nums =[1,1,1,2,2,3],
Your function should return length =5, with the first five elements of nums being1,1,2,2 and 3. It doesn't matter what you leave beyond the new length.

public class Solution {
    public int removeDuplicates(int[] nums) {
        int n = nums.length;
        int count = 0;
        if(n<=2)
           return n;
        int j = 1;
        for(int i =2;i