括号匹配但错误：解析

Question

public class IntList implements Cloneable 
{
    IntNode b = new IntNode();      // A reference to IntNode
    private IntNode head;           //Reference to first node of the linked list
    private IntNode tail;           //Reference to the last node of the linked list
    private IntNode currentIndex;   //Reference to node with current element
    private IntNode preIndex;       //Reference to node before the current element
    private int manyNodes;          //Number of nodes in the linked list
  // Student's invariant here
  public IntList() {        //Creates an empty linked list
      head = null;      
      tail = null;
      currentIndex = null;
      preIndex = null;
     manyNodes = 0;
    }   
}

此代码产生错误“错误：解析时达到文件末尾”，我不确定为什么因为所有曲线括号都匹配