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Java Forum / General / November 2006type parameter X is not within its bound
I get the following error, and I'm not sure why. EKT.java:7: type parameter WordPair is not within its bound static BST<WordPair> tree = new BST<WordPair>(); ^ EKT.java:7: type parameter WordPair is not within its bound static BST<WordPair> tree = new BST<WordPair>(); ^ 2 errors > Terminated with exit code 1. BST is declared as: class BST<T extends Comparable<? super T>> and WordPair is declared as: class WordPair implements Comparable Let me know if you need more information. WordPair implements Comparable, and BST requires a Comparable class. I'm not sure what the problem is. BST<Integer> works fine. > I get the following error, and I'm not sure why. > [quoted text clipped - 14 lines] > WordPair implements Comparable, and BST requires a Comparable class. > I'm not sure what the problem is. BST<Integer> works fine. I forget how I came up with this solution... it hurt my head just thinking about it... but here's what I came up with (it compiles now) Just had to change WordPair's declaration to: class WordPair implements Comparable<WordPair> and then change my compareTo function to public int compareTo(WordPair wp) instead of taking an object... which also means that I no longer have to cast it to a wordpair! Two birds with one stone. Mark schreef: >> I get the following error, and I'm not sure why. >> [quoted text clipped - 23 lines] > instead of taking an object... which also means that I no longer have > to cast it to a wordpair! Two birds with one stone. Indeed, as I mentioned in my other post, Comparable is parameterised. Once you start off with generics, you have to use parameters on /all/ generic classes. H. - -- Hendrik Maryns http://tcl.sfs.uni-tuebingen.de/~hendrik/ ================== http://aouw.org Ask smart questions, get good answers: http://www.catb.org/~esr/faqs/smart-questions.html > I get the following error, and I'm not sure why. > [quoted text clipped - 14 lines] > WordPair implements Comparable, and BST requires a Comparable class. > I'm not sure what the problem is. BST<Integer> works fine. WordPair implements Comparable<WHAT??> Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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