为什么我不想在插入类型中嵌入此循环？

Question

I have a class and right now we are doing insertion sort. I think my code worked properly but my professor said not to embed one of my loops (it shifts the values in my array over) and that it should be done while "searching".

public static void insertionSort(int array[]) {
    int n = array.length;
    for(int i = 0; i < n; i++) {
        int nextIndex = i;
        for(int j = 0; j < i; j++) {
            if(array[nextIndex] < array[j]) {
                int temp = array[nextIndex];
                // ********************************
                for(int k = i; k > j; k--) { 
                    array[k]=array[k-1];
                }
                // ********************************
                array[j]=temp;
                j = i
            }
        }
    }
}

What's wrong with the above?

Answer 1

I think what your professor meant is this: You are currently looking through the sorted part of your array [0..i] from bottom to top to find the position at which the new element should be inserted. Afterwards you move through your array from top to bottom to shift the new element to the right position.

Instead, you could just move the new element through the element and simultaneously look for the right position, similar to Bubblesort, if you know the algorithm. This saves you this for -loop your prof marked.