change pivot in my quickSort algorithm java

Question

I have implemented a working quickSort algorithm using the first element in the array as the pivot, that look like this:

public int[] quickSort( int[] a, int st         


        

Answer 1

You could simply swap the pivot you chose with the first element in the array before you start sorting, that way it'll work exactly as before.

int l = start;
int r = end;

this.swap(a, choosePivot(), start); 
int pivotIndex = start;