操作數類型的錯誤

Question

我試圖執行binarysearchtree（添加法）仿製藥，但它給了我這樣那樣的錯誤：

genericstree.java:36: error: bad operand types for binary operator '>' 
      if (value > iterator.m_Value) 
        ^
    first type: T 
    second type: T 
    where T is a type-variable: 
    T extends Comparable<T> declared in class BinarySearchTree 
genericstree.java:42: error: bad operand types for binary operator '<' 
     if (value < prev.m_Value) 
       ^
    first type: T 
    second type: T 
    where T is a type-variable: 
    T extends Comparable<T> declared in class BinarySearchTree 
2 errors 

代碼波紋管：

class BinarySearchTree<T extends Comparable<T>> 
{ 
    class Node<T extends Comparable<T>> 
    { 
     Node<T> left; 
     Node<T> right; 
     T  m_Value; 

     Node(T value) 
     { 
      left = null; 
      right = null; 
      m_Value = value; 
     } 
    } 

    Node<T> m_Root; 

    BinarySearchTree() { m_Root = null; } 
    void addNode(T value) 
    { 
     Node<T> tmp = new Node<T>(value); 
     if (m_Root == null) 
     { 
      tmp.m_Value = value; 
      m_Root = tmp; 
      return; 
     } 

     Node<T> iterator = m_Root; 
     Node<T> prev = m_Root; 
     while (iterator != null) 
     { 
      prev = iterator; 
      if (value > iterator.m_Value) 
       iterator = iterator.right; 
      else 
       iterator = iterator.left; 
     } 

     if (value < prev.m_Value) 
      prev.left = tmp; 
     else 
      prev.right = tmp; 
    } 
} 

我認爲問題之替換爲T對象可以通過任何類型，然後它不能比較它們，但我擴展類與可比較，但它沒有解決它。

是什麼導致了這個問題，我該如何解決它？

Answer 1

不能在任何對象操作數上使用<和>運算符，即使它們實現了Comparable。您只能將它們應用於數字操作數。

與

if (value.compareTo(prev.m_Value) < 0)