普通推到堆棧提供了編譯錯誤

Question

我有如下定義一個節點類 -

public static class Node<T> { 
    public T value; 
    public Node<T> left; 
    public Node<T> right; 

    public Node(T value) { 
     this.value = value; 
     left = null; 
     right = null; 
    } 

} 

現在我想添加/推Node<Integer>爲Stack<Node<T>>，它給了我一個編譯錯誤。

private static <T> Node<T> createTree(Expression expression) { 
    Stack<Node<T>> nodeStack = new Stack<>(); 
    Stack<Token> tokenStack = new Stack<>(); 

    Token token = getNextToken(expression); 

    while (token != null) { 
     if (token instanceof OpenParenthesis) { 
      tokenStack.push(token); 
     } else if (token instanceof Element) { 
      nodeStack.push(new Node<Integer>(((Element) token).value)); // Here 
     } else if (token instanceof EmptyElement) { 
      nodeStack.push(null); 
     } else if (token instanceof CloseParenthesis) { 
      if (nodeStack.size() == 1) { 
       tokenStack.pop(); 
       return nodeStack.pop(); 
      } 

      tokenStack.pop(); 
      Node<T> right = nodeStack.pop(); 
      Node<T> left = nodeStack.pop(); 
      Node<T> node = nodeStack.pop(); 
      node.left = left; 
      node.right = right; 
      nodeStack.push(node); 
     } 

     token = getNextToken(expression); 
    } 

    return null; 
} 

這行不編譯 -

nodeStack.push(new Node<Integer>(((Element) token).value)); 

與消息 -

在Stackpush(Node<T>)不能應用於(Node<java.lang.Integer>)