I have an abstract class that is like this:
public abstract class Node<T extends Comparable<T>>
I need extends Comparable<T> so that I may use .compareTo() with generic type T.
I try to extend this class with this sub-class declaration:
public class ListNode<T> extends Node<T extends Comparable<T>>
However this throws SyntaxErrors in eclipse for the second extends and for the final two >>.
Is this the way to declare the sub-class? It seems so messy.
public class ListNode<T extends Comparable<T>> extends Node<T extends Comparable<T>>
How should this be done? Cheers in advance.
With Node as
public abstract class Node<T extends Comparable<T>>{}
ListNode can be:
public class ListNode<T extends Comparable<T>> extends Node<T>
The key thing to note is that the type parameter after the name of the declared class is what constrains T for everything else in the class. This includes the other types extended by the declared class.
This means that once you have bounded T you don't need to do it again in the extends/implements statements.
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