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Java中快速排序算法的递归和非递归实现都是常见的排序方法。下面分别给出两种实现方式的代码示例：
- 递归实现：
public class QuickSortRecursive { public static void main(String[] args) { int[] arr = {10, 7, 8, 9, 1, 5}; quickSort(arr, 0, arr.length - 1); System.out.println(Arrays.toString(arr)); } public static void quickSort(int[] arr, int low, int high) { if (low< high) { int pivotIndex = partition(arr, low, high); quickSort(arr, low, pivotIndex - 1); quickSort(arr, pivotIndex + 1, high); } } public 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; } public static void swap(int[] arr, int i, int j) { int temp = arr[i]; arr[i] = arr[j]; arr[j] = temp; } } - 非递归实现：
import java.util.Arrays; import java.util.Stack; public class QuickSortNonRecursive { public static void main(String[] args) { int[] arr = {10, 7, 8, 9, 1, 5}; quickSort(arr); System.out.println(Arrays.toString(arr)); } public static void quickSort(int[] arr) { Stack<Integer> stack = new Stack<>(); stack.push(0); stack.push(arr.length - 1); while (!stack.isEmpty()) { int high = stack.pop(); int low = stack.pop(); if (low< high) { int pivotIndex = partition(arr, low, high); stack.push(low); stack.push(pivotIndex - 1); stack.push(pivotIndex + 1); stack.push(high); } } } public 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; } public static void swap(int[] arr, int i, int j) { int temp = arr[i]; arr[i] = arr[j]; arr[j] = temp; } } 这两个示例中，递归实现使用了函数调用栈来存储待处理的子数组的边界，而非递归实现使用了一个显式的栈来达到相同的目的。在实际应用中，选择哪种实现方式取决于特定问题和需求。
