这是我的代码

import java.util.Scanner;
import java.io.File;
import java.util.*;
import java.io.*;

class BubbleSort{
  static class Node {
    int val;
    Node next;

    Node (int x) {
      val = x;
      next = null;
    }
  }

  public static void main(String[] args) throws FileNotFoundException {
    Scanner scanner = new Scanner(new File(args[0]));
    Node insertion = new Node(scanner.nextInt());
    Node intNodes = insertion;
    while(scanner.hasnextInt()){
      Node nextNode = new Node(scanner.nextInt());
      insertion.next = nextNode;
      insertion = nextNode;
    }
    intNodes = bubbleSortList(intNodes);
    printList(intNodes);
  }
  public static Node bubbleSortList(Node head) {
    int swapped,i;
    Node x;
    Node y = null;
    if (head == null)
        return null;
    do
    {
      swapped = 0;
      x = head;
      while (x.next != y)
      {
        if (x.val < x.next.val)
       {
         int t = x.val;
         x.val = x.next.val;
         x.next.val = t;
         swapped = 1;
       }
        x = x.next;
    }
    y = x;
   }
   while (swapped != 0);
     return head;
 }
  public static void printList(Node n) {
    while (n != null) {
     System.out.print(n.val + " ");
     n = n.next;
   }
 }
}

它有效，我的问题是列表的末尾有一个空格，并且有一种摆脱它的方法。 它会输出：10space9space8space7space6space5space4space3space2space1space。 我想要的是10space9space8space7space6space5space4space3space2space1 ...我以“空格”为参考