Question

I want to extend my BinaryTree class so that only Integer parameters are accepted and I can reuse the code.

public class BinaryTree<T extends Comparable<T>>  
{/*code omitted for convenience*/}  
public class BinaryTreeInt<T extends Integer> extends BinaryTree<T>  
{/*code omitted for convenience*/}

I get following error on compilation-

BinaryTreeInt.java:1: type parameter T is not within its bound
public class BinaryTreeInt<T extends Integer> extends BinaryTree<T>
                                                                 ^
1 error

Can someone guide how to write code for such inheritance?

Answer 1

Integer is final so what you have is

public class BinaryTreeInt extends BinaryTree<Integer>

However the type implies its is int rather than Integer