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I get nearly the same error, using this implementation as well.



C:\Users\username\Documents\Programming>javac BSTree.java
BSTree.java:42: cannot find symbol
symbol : method clone()...

The compiler seems to accept <E extends Comparable, Cloneable>, but as soon as it reaches


data = element.clone()

I get:


C:\Users\username\Documents\Programming>javac BSTree.java...

I know that it is possible to force generic parameters to implement certain interfaces like the following:



public class Stuff <E extends Comparable>
{
//...
}