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Cannot Be Cast To Java.lang.comparable Treemap


If no comparator is specified, we could chose a new comparator unordered. I'm afraid I find free time to fix them in a short time. Wouter Oet Saloon Keeper Posts: 2700 I like... posted 7 years ago I'd go the easy way: use a ToStringComparator: class ToStringComparator implements Comparator { public int compare(Object o1, Object o2) { return o1.toString().compareTo(o2.toString()); } }That will not allow http://pgexch.com/cannot-be/cannot-be-cast-to-java-lang-comparable-treeset.html

I'm not sure how people in general deal with this kind of issue, and I know that flatMap() is coming from the Traversable trait, but somehow it would be great if Is there a word for being sad about knowing that the things that make you happy will eventually go away Safety - Improve braking power in wet conditions How EXACTLY can Many thanks! The RedBlackTree will contain at maximum 1 element then because it represents a Set and all elements are equal o_O. page

Cannot Be Cast To Java.lang.comparable Treemap

If no comparator is specified we take the naturalComparator for elements of type U (even if elements of U are not comparable - that's also the way java.util.SortedSet is working). We should return -1 instead. That's *not* the problem - at least for this exception: class ModuleBean, line 817: realModules.remove(realModules); You're trying to remove a TreeSet from itself - probably You wanted to write: realModules.removeAll(realModules); ? Polyglot Anagrams Cops' Thread Find the Emirps!

This looks way too complicated. You didn't provide a Comparator so the TreeSet casted the element to a comparable and that caused the Exception because your class didn't implement it. Formula 1 rebus How can I take a powerful plot item away from players without frustrating them? Java Implement Comparable Comment 4 Peter Nabbefeld 2011-09-19 11:52:01 UTC Don't know why, after some time I could now activate some modules.

That's right. The scan methods look like this: // DEV-NOTE: The return type is either Set or SortedSet, depending whether U is Comparable @Override Set scanLeft(U zero, BiFunctionhttp://stackoverflow.com/questions/2504803/list-to-treeset-conversion-produces-java-lang-classcastexception-myclass-cann If we got to the hashCode branch of our if-statement we already know that the objects are not equal.

David Newton Author Rancher Posts: 12617 I like... Arraylist Is Ordered While Hashset Is Not If are a volunteer, all patches are welcome. It is important to provide a safe API, i.e. If are a volunteer, all patches are welcome.

Treeset Comparable Example

The same applies to SortedSet.map. https://coderanch.com/t/461391/java/TreeSet-RuntimeException-code You signed in with another tab or window. Cannot Be Cast To Java.lang.comparable Treemap Question is if the scenario you described is mandatory then why compiler compiles that program. –Rais Alam Apr 11 '13 at 7:44 @FireFly: It's mandatory, but is not enforced Cannot Be Cast To Java.lang.comparable Java java exception collections set treeset share|improve this question asked Apr 11 '13 at 7:31 Rais Alam 4,458104381 Employee must implement the interface Comparable to be able to use Treeset.

Does Intel sell CPUs in ribbons? check my blog The static factory methods, e.g. super T, ? Agreed. Treeset Comparator Example

Should I report it? Both plugins (MM, MMR) are just > weekend projects, not part of NetBeans distribution, published on Update Center > for plugins in Beta quality. Is Area of a circle always irrational What is the point of update independent rendering in a game loop? http://pgexch.com/cannot-be/ljava-lang-object-cannot-be-cast-to-ljava-lang-comparable.html Not the answer you're looking for?

What is the point of update independent rendering in a game loop? Comparable Interface Java and strphan for your valuable suggestions . Space of real sequences with finitely many nonzero elements is a Banach space?

That comparator can't be shared across many trees as the useNatural is specific to a tree.

I'm afraid I find free time to fix them in a short > time. Bug202278 - [71cat] ClassCastException: java.util.TreeSet cannot be cast to org.openide.modules.ModuleInfo Summary: [71cat] ClassCastException: java.util.TreeSet cannot be cast to org.openide.m... asked 3 years ago viewed 13657 times active 3 years ago Upcoming Events 2016 Community Moderator Election ends Nov 22 Linked 0 ClassCastException with Java's TreeMap when using custom classes as Java Treeset Example To be honest, it took me a bit of time to find where the problem was in my code.

Good programmers write code that humans can understand." --- Martin Fowler Please correct my English. Perhaps my story / rant is a bit over complex for this discussion. When I tried to activate BugZilla, NB wanted to download some eclipse modules and failed with this exception again. http://pgexch.com/cannot-be/java-lang-classcastexception-java-lang-string-cannot-be-cast-to-object.html Or use a Comparator and pass that to the constructor if you want objects sorted in different ways in different places.

SiteMap About Us Contact Legal & Licences By use of this website, you agree to the NetBeans Policies and Terms of Use. © 2014, Oracle Corporation and/or its affiliates. Either one must exist, but the compiler can't force such a constraint because it's not possible to do so at compile time. –LeleDumbo Apr 11 '13 at 7:49 add a comment| I will come back to this issue during this week (because of too many parallel tasks already). - Daniel JΛVΛSLΛNG member danieldietrich commented Sep 28, 2016 • edited I agree that I think in practice it will be a rare case.

What does "there lived here then" mean? Any other thoughts? super K>,V> create() { return new TreeMap(); } public static create(Comparator

like this: O------------------------ / \ T extends Comparable T' / \ / \ T1 T2 T3 T4 Example: Set set = Set.of(t1, t2, t3, t4); where t1 of type T1, t2 We should take a shortcut if type(o1) == type(o2). java classcastexception share|improve this question edited Mar 24 '10 at 1:39 asked Mar 24 '10 at 1:32 Chuck 3301512 add a comment| 3 Answers 3 active oldest votes up vote 18 You would have had the same error when using these objects in a TreeMap, or when they were in a List and you sorted it using Collections.sort(List).

With Comparable Not possible, you can sort the objects in the (only) way defined in compareTo() method. I gived it some thoughts but i dont get it well should i extends the Comparable interface?, and should i compare my TreeSetX to what specificaly? Regards. The same thing applies for Map methods...

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