java快速排序（最精简代码）

public class QuickSort {
	public int partition(int[] sortArray, int low, int height) {
		int key = sortArray[low];// 刚开始以第一个数为标志数据
		while (low < height) {
			while (low < height && sortArray[height] >= key)
				height--;// 从后面开始找，找到比key值小的数为止
			sortArray[low] = sortArray[height];// 将该数放到key值的左边
			while (low < height && sortArray[low] <= key)
				low++;// 从前面开始找，找到比key值大的数为止
			sortArray[height] = sortArray[low];// 将该数放到key值的右边
		}
		sortArray[low] = key;// 把key值填充到low位置，下次重新找key值
		// 打印每次排序结果
		for (int i = 0; i <= sortArray.length - 1; i++) {
			System.out.print(sortArray[i] + "\t");
		}
		System.out.println();
		return low;
	}

	public void sort(int[] sortArray, int low, int height) {
		if (low < height) {
			int result = partition(sortArray, low, height);
			sort(sortArray, low, result - 1);
			sort(sortArray, result + 1, height);
		}
	}

	public static void main(String[] args) {
		QuickSort quickSort = new QuickSort();
		int[] array = { 5, 69, 12, 3, 56, 789, 2, 5648, 23 };
		for (int i = 0; i <= array.length - 1; i++) {
			System.out.print(array[i] + "\t");
		}
		System.out.println();
		quickSort.sort(array, 0, 8);
		for (int i = 0; i <= array.length - 1; i++) {
			System.out.print(array[i] + "\t");
		}
	}
}