How to quickly sort functions in java

Quick sorting method: 1. Create a Java sample file; 2. Implement the quick sorting algorithm through the quickSort method; 3. Select an element in the array as the pivot (pivot) and divide the array into two sub- Array, one contains elements smaller than the pivot element, and the other contains elements larger than the pivot element, and then recursively apply the quick sort algorithm to the two sub-arrays; 4. Sort the array in the main method and output the result. .

Operating system for this tutorial: Windows 10 system, Dell G3 computer.

The following is the sample code to implement the quick sort algorithm in Java:

public class QuickSort {
    public static void quickSort(int[] arr, int low, int high) {
        if (arr == null || arr.length == 0) {
            return;
        }
        if (low >= high) {
            return;
        }
        int middle = low + (high - low) / 2;
        int pivot = arr[middle];
        int i = low, j = high;
        while (i <= j) {
            while (arr[i] < pivot) {
                i++;
            }
            while (arr[j] > pivot) {
                j--;
            }
            if (i <= j) {
                int temp = arr[i];
                arr[i] = arr[j];
                arr[j] = temp;
                i++;
                j--;
            }
        }
        if (low < j) {
            quickSort(arr, low, j);
        }
        if (high > i) {
            quickSort(arr, i, high);
        }
    }
    public static void main(String[] args) {
        int[] arr = {5, 2, 8, 3, 9, 1};
        quickSort(arr, 0, arr.length - 1);
        for (int num : arr) {
            System.out.print(num + " ");
        }
    }
}

In the above In the example, the quickSort method implements the quick sort algorithm. This algorithm selects an element in the array as the pivot and divides the array into two subarrays, one containing elements smaller than the pivot and the other containing elements larger than the pivot. The quicksort algorithm is then applied recursively to the two subarrays. Finally, the array is sorted and the results are output in the main method.

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