CODEWITHSUNDEEP
javagenericscomparable
user718083
user718083

Reputation: 25

Comparable and generics

When this class is created..

public static class TreeNode<E extends Comparable<E>>

what does the <E extends Comparable<E>> mean?

Upvotes: 1

Views: 670

Answers (2)

Spidy
Spidy

Reputation: 39992

It means that whenever you create an instance of this class like

TreeNode<MyClass> myTreeNode = new TreeNode<MyClass>();

MyClass must implement Comparable < MyClass >

public class MyClass implements Comparable<MyClass>
{
      //CODE
}

Upvotes: 5

Justin Niessner
Justin Niessner

Reputation: 245399

That is a generic constraint.

It means that whatever type you store in the TreeNode must implement the Comparable<E> interface.

Upvotes: 6

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