How can I implement sorting algorithms in Java?

How can I implement sorting algorithms in Java?

You can implement various sorting algorithms like Bubble Sort, Quick Sort, and Merge Sort in Java. Which one are you interested in?

Can you show me an example of Quick Sort?

Sure! Here's a simple implementation of Quick Sort 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 is the time complexity of Quick Sort?

The average time complexity of Quick Sort is O(n log n), but in the worst case, it can be O(n²) if the pivot selection is poor.