将y总模板do-while改为while版本(Java)

import java.util.Scanner;
import java.io.BufferedInputStream;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(new BufferedInputStream(System.in));
        int n = in.nextInt();
        int[] arr = new int[n];
        for (int i = 0; i < n; i++) {
            arr[i] = in.nextInt();
        }
        quick_sort(arr, 0, n - 1);
        for (int i = 0; i < n; i++) {
            System.out.print(arr[i] + " ");
        }
    }
    private static void quick_sort(int[] nums, int l, int r)
    {
        if (l >= r) return;
        int i = l, j = r, x = nums[l + r >> 1];
        while (true)
        {
            while (nums[i] < x) {
                i++;
            }
            while (nums[j] > x) {
                j--;
            }
            if (i < j) {
                swap(nums, i++, j--);
            } else {
                break;
            }
        }
        quick_sort(nums, l, j);
        quick_sort(nums, j + 1, r);
    }
    private static void swap(int[] nums, int i, int j) {
        int temp = nums[i];
        nums[i] = nums[j];
        nums[j] = temp;
    }    
}