Generic binary Search tree class declaration error

Question

I am trying to create a BinarySearchTree using generics, but I am bumping into an error. I want my class to extend Number and Implement Comparable. So I declare it this way:

public class BinaryTree<K extends Number implements Comparable<? super K>, E>

But I am getting an error.

File: F:\Java\intro-prog-java\bookClasses\Lab_5\BinaryTree.java [line: 1] Error: > expected

I cannot get whats wrong with it.

Ted Hopp · Accepted Answer · 2012-02-24 04:29:18Z

5

That's the wrong syntax. Try this:

public class BinaryTree<K extends Number & Comparable<? super K>, E>

This syntax is described in the Bounded Type Parameters topic of the Java tutorials on generics as well as §4.4 of the Java Language Specification.

answered Feb 24, 2012 at 4:29

Ted Hopp

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