[英]generic type scope does not apply to inner class?
I have the following code where type T extends Comparable, but I get a compile error when I try to do 我在T类型扩展Comparable的地方有以下代码,但是在尝试执行此操作时出现编译错误
root.node.compareTo(min).
root.node.compareTo(min)。
Saying compareTo does not apply. 说compareTo不适用。 It seems generic type scope does not apply to inner class?
似乎泛型类型范围不适用于内部类吗?
public class Tree<T extends Comparable> {
public class Node<T>{
private T node;
private Node<T> left;
private Node<T> right;
public Node(T node, Node<T> left, Node<T> right) {
super();
this.node = node;
this.left = left;
this.right = right;
}
}
public boolean isBalanced(Node<T> root){
return isBalanced(root, Integer.MIN, Integer.MAX);
}
private boolean isBalanced(Node<T> root, T min, T max){
if(root == null){
return true;
}
if(root.node.compareTo(min) < 0 || root.node.compareTo(max) > 0){
return false;
}
return isBalanced(root.left, min, root.node) || isBalanced(root.right, root.node, max);
}
}
When you say public class Node<T>
, you're shadowing the <T>
from the outer class. 当您说
public class Node<T>
,您正在遮蔽外部类的<T>
。 You should either remove the <T>
from the inner class declaration or, better, make the inner class a static nested class (since there's no inherent reason the node needs to know about the tree it's attached to). 您应该从内部类声明中删除
<T>
,或者最好使内部类成为静态嵌套类(因为没有内在的原因,节点无需知道它所连接的树)。
(Note: Also use <T extends Comparable<T>>
.) (注意:还要使用
<T extends Comparable<T>>
。)
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