Remove Duplicates from Sorted Array II

public class Solution {
    public int removeDuplicates(ArrayList<Integer> a) {
        int j=0;
        int n = a.size();
        int count = 1;
        for(int i=1;i<n;i++){
            int v1 = a.get(i);
            int v2 = a.get(j);
            if(v1!=v2){
                count = 1;
                j++;
                Collections.swap(a,i,j);
            }else if(v1 == v2 && count<=1){
                count++;
                j++;
                Collections.swap(a,i,j);
            }else{
                count++;
            }
        }
        return j+1;
    }
}