帮我用Java写一个快速排序
时间: 2023-02-22 19:51:28 浏览: 49
好的,以下是 Java 实现的快速排序算法:
```
import java.util.Arrays;
public class QuickSort {
public static void main(String[] args) {
int[] arr = {4, 7, 6, 5, 3, 2, 8, 1};
sort(arr, 0, arr.length - 1);
System.out.println(Arrays.toString(arr));
}
private static void sort(int[] arr, int low, int high) {
if (low < high) {
int pivot = partition(arr, low, high);
sort(arr, low, pivot - 1);
sort(arr, pivot + 1, high);
}
}
private static int partition(int[] arr, int low, int high) {
int pivot = arr[high];
int i = low - 1;
for (int j = low; j < high; j++) {
if (arr[j] <= pivot) {
i++;
swap(arr, i, j);
}
}
swap(arr, i + 1, high);
return i + 1;
}
private static void swap(int[] arr, int i, int j) {
int temp = arr[i];
arr[i] = arr[j];
arr[j] = temp;
}
}
```
希望这能帮到你!
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