How can I implement advanced sorting algorithms in Java?

How can I implement advanced sorting algorithms in Java?

You can implement advanced sorting algorithms like QuickSort, MergeSort, and HeapSort in Java. Would you like a code example for a specific one?

Yes, please show me how to implement QuickSort.

Sure! Here's a simple implementation of QuickSort in Java:

public class QuickSort {
    public static void quickSort(int[] arr, int low, int high) {
        if (low < high) {
            int pi = partition(arr, low, high);
            quickSort(arr, low, pi - 1);
            quickSort(arr, pi + 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++;
                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;
    }
}

You can call quickSort(array, 0, array.length - 1); to sort your array.

What are the time complexities of QuickSort?

QuickSort has an average time complexity of O(n log n) and a worst-case time complexity of O(n²), which occurs when the pivot is the smallest or largest element.