使用toString打印出链表

public static void main(String[] args) {    linkedList list = new linkedList();    list.insertFront(1);    list.insertFront(2);    list.insertFront(3);    System.out.println(list.toString());}String toString() { String result = ""; linkedListNode current = head; while(current.getNext() != null){     result += current.getData();     if(current.getNext() != null){          result += ", ";     }     current = current.getNext(); } return "List: " + result;}