Remove Duplicates from Sorted Array

public class Solution {
    public int removeDuplicates(int[] nums) {
        if(nums.length<2)
        return nums.length;
        int idx =0;
        int dup =nums[idx];
        for(int i=1;i<nums.length;i++){
            if(nums[i]!=dup){
                ++idx;
                nums[idx] = nums[i];
                dup =nums[idx];
            }
        }
        return idx+1;
    }
}