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POTrouble swapping values as keys in generic java BST class
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13442676
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2012-11-18T17:34:49.573
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2012-11-18T22:56:08.117
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2012-11-18T22:56:08.117
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I was given a generic binary search tree class with the following declaration: <pre><code>public class BST<K extends Comparable<K>, V> </code></pre> I was asked to write a method that reverses the BST such that the values become the keys and keys become values. When I call the following method (defined in the class given) <pre><code>reverseDict.put(originalDict.get(key), key); </code></pre> I get the following two error messages from Netbeans: <blockquote> Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - Erroneous sym type: BST.put </blockquote> And also: <blockquote> no suitable method found for <code>put(V,K)</code> method <code>BST.put(BST<K,V>.Node,K,V)</code> is not applicable (actual and formal argument lists differ in length) method <code>BST.put(K,V)</code> is not applicable (actual argument <code>V</code> cannot be converted to <code>K</code> by method invocation conversion) where <code>V</code>,<code>K</code> are type-variables: <code>V extends Object</code> declared in method <code><K,V>reverseBST(BST<K,V>)</code> <code>K extends Comparable<K></code> declared in method <code><K,V>reverseBST(BST<K,V>)</code> </blockquote> From what the error messages are telling me, since my values do not extend <code>Comparable</code> I am unable to use them as keys. If I am right, how can I get around that without changing the class given (maybe a cast)? 
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<java><generics>
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Trouble swapping values as keys in generic java BST class
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