public class Main {

    public static void main(String[] args){

        //assuming array is ordered
        int[] a = {1,1,2,2,2,3,3,4,5,6,7,7};
        printArray(a);
        a = deleteDuplicatesFromOrderedArray(a);
        printArray(a);
    }

    public static void printArray(int[] arr){
        System.out.println("***Printing***");
        for(Integer i : arr){
            System.out.println("--> " + i);
        }
    }

    public static int[] deleteDuplicatesFromOrderedArray(int[] arr){
        int[] newArr = new int[arr.length];

        int k=0;
        for(int i=0; i<arr.length-1; i++){
            if(arr[i] != arr[i+1] || i == arr.length-2){
                newArr[k] = arr[i];
                k++;
            }
        }
        return newArr;
    }
}