如何在Java中解決「錯誤：找不到符號」？

Question

public void sort(){ 

Node sortedList = null; 

    while(sortedList != null){ 

    Node current = sortedList; 
    sortedList = sortedList.next; 
    Node x; 
    Node previous = null; 
    for(x = sortedList; x != null; x = x.next){ 
     if(current.value < x.value){ 
       break; 
     } 
     previous = x; 
    } 
    if(previous == null){    
      current.next = sortedList; 
      sortedList = current; 
    } 
    else{    
     current.next = previous.next; 
     previous.next = current; 
    } 

    return sortedList; 
}}} 

這是錯誤消息：

LinkedList.java:352: error: cannot find symbol 
if(current.value < x.value){ 
     ^
symbol: variable value 
location: variable current of type `LinkedList.Node` 

Answer 1

這是因爲方法sort()的返回類型是void，但你嘗試從sort()

return sortedList; 

返回值看你的代碼，我想您可能希望將其聲明爲：

public Node sort() 

附加說明：您發佈的代碼片段似乎有額外的大括號}。您可能也需要查找。