Duplicates in a sorted java array

Question

I have to write a method that takes an array of ints that is already sorted in numerical order then remove all the duplicate numbers and return an array of just the numbers

Answer 1

public int[] noDups(int[] arr){

    int j = 0;
    // copy the items without the dups to res
    int[] res = new int[arr.length];
    for(int i=0; i

First loop is O(n) and so is the second loop - which totals in O(n) as requested.