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Java - Static Generic Type using Comparable
public class BSTNode<E extends Comparable<? super E>>{
     E data;
     BSTNode<E> left;
     BSTNode<E> right;
     //and I'm trying to define a static method(inside of the class) like this:
     public static <E> String displayAscending(BSTNode<E> node){}
}

public static <E extends Comparable<? super E>> String displayAscending(BSTNode<E> node)