Java中常用的快速排序方法有以下几种：
使用递归实现的快速排序方法：public void quickSort(int[] arr, int low, int high) { if (low < high) { int pivot = partition(arr, low, high); quickSort(arr, low, pivot - 1); quickSort(arr, pivot + 1, high); }}public 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++; int temp = arr[i]; arr[i] = arr[j]; arr[j] = temp; } } int temp = arr[i + 1]; arr[i + 1] = arr[high]; arr[high] = temp; return i + 1;}public void quickSort(int[] arr, int low, int high) { Stack<Integer> stack = new Stack<>(); stack.push(low); stack.push(high); while (!stack.isEmpty()) { high = stack.pop(); low = stack.pop(); int pivot = partition(arr, low, high); if (pivot - 1 > low) { stack.push(low); stack.push(pivot - 1); } if (pivot + 1 < high) { stack.push(pivot + 1); stack.push(high); } }}public 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++; int temp = arr[i]; arr[i] = arr[j]; arr[j] = temp; } } int temp = arr[i + 1]; arr[i + 1] = arr[high]; arr[high] = temp; return i + 1;}这些方法都是基于快速排序的原理实现的，可以根据需要选择合适的方法来实现快速排序算法。
