Sort - JAVA implementation [six] quick sort

package org.lion.euler.study.sort;

public class QuickSort extends AbstractSort {

	@Override
	public void sort(Integer[] array) {
		this.sort(array, 0, array.length);
	}
	
	private void sort(Integer[] array, int begin, int end) {
		if(begin >= end){
			return;
		}
		int low = begin;
		int high = end;
		while(begin < end){
			while(begin < end && array[begin] <= array[end - 1]){
				end -= 1;
			}
			if(begin < end){
				swap(array, begin, end - 1);
			}
			while(begin < end && array[begin] <= array[end - 1]){
				begin += 1;
			}
			if(begin < end){
				swap(array, begin, end - 1);
			}
		}
		this.sort(array, low, begin - 1);
		this.sort(array, begin + 1, high);
	}

}