使用java写一个堆排序程序

好的，我可以回答这个问题。以下是一个使用 Java 编写的堆排序程序：

public class HeapSort {
    public static void sort(int[] arr) {
        int n = arr.length;

        // Build heap (rearrange array)
        for (int i = n / 2 - 1; i >= ; i--)
            heapify(arr, n, i);

        // One by one extract an element from heap
        for (int i = n - 1; i >= ; i--) {
            // Move current root to end
            int temp = arr[];
            arr[] = arr[i];
            arr[i] = temp;

            // call max heapify on the reduced heap
            heapify(arr, i, );
        }
    }

    // To heapify a subtree rooted with node i which is
    // an index in arr[]. n is size of heap
    static void heapify(int[] arr, int n, int i) {
        int largest = i; // Initialize largest as root
        int l = 2 * i + 1; // left = 2*i + 1
        int r = 2 * i + 2; // right = 2*i + 2

        // If left child is larger than root
        if (l < n && arr[l] > arr[largest])
            largest = l;

        // If right child is larger than largest so far
        if (r < n && arr[r] > arr[largest])
            largest = r;

        // If largest is not root
        if (largest != i) {
            int swap = arr[i];
            arr[i] = arr[largest];
            arr[largest] = swap;

            // Recursively heapify the affected sub-tree
            heapify(arr, n, largest);
        }
    }
}

这个程序使用堆排序算法对一个整数数组进行排序。堆排序是一种高效的排序算法，时间复杂度为 O(n log n)。