写一个快速排序 java
时间: 2023-05-22 07:00:58 浏览: 47
代码如下:
public class QuickSort {
public static void main(String[] args) {
int[] arr = {5, 2, 9, 3, 7, 6, 1, 8, 4};
quickSort(arr, 0, arr.length - 1);
System.out.println(Arrays.toString(arr));
}
public static void quickSort(int[] arr, int left, int right) {
if (left < right) {
int pivot = partition(arr, left, right);
quickSort(arr, left, pivot - 1);
quickSort(arr, pivot + 1, right);
}
}
public static int partition(int[] arr, int left, int right) {
int pivot = arr[left];
while (left < right) {
while (left < right && arr[right] >= pivot) {
right--;
}
arr[left] = arr[right];
while (left < right && arr[left] <= pivot) {
left++;
}
arr[right] = arr[left];
}
arr[left] = pivot;
return left;
}
}