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Cannot Be Cast To Java.lang.comparable Set

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ThreadLocal in Java. Thanks for the great work guys, and keep going ;) Cheers, /Benoit 👍 1 JΛVΛSLΛNG member danieldietrich commented Mar 24, 2016 Hi @benoitheinrich, the existing comparator is related to elements Update 3: o1.hashCode() - o2.hashCode() is not a good solution in general. JΛVΛSLΛNG member danieldietrich commented Oct 7, 2016 Just returning -1 seems like the only plausible way to resolve the hash collision, but that itself smells as well. Source

How can I avoid being chastised for a project I inherited which was already buggy, but I was told to add features instead of fixing it? Integer number = (Integer) stringObject; java.lang.classcastexception java.lang.string cannot be cast to java.util.date :This error will come when you cast String to Date in Java, since both are not related to each How to Create and Evaluate XPath Expression in Jav... it is same case like you give anonymous Comparator implementation.

Treeset Comparable Example

When you have one element there is nothing to compare so it doesn't detect the problem. extends U> mapper); The above are Set methods. Common Mistake of Comparable Interface First take a took at the following code which create 3 dogs and add those dogs to a TreeSet.

Even better would be to take the naturalComparator, if there exsists an order and the unordered comparator as fallback. Hmmm. EDIT: Thought about the additional constraints more. Java Treeset Example Constructor Chaining in Java - Calling one constru...

The 10'000 year skyscraper Newton's second law for individual forces What commercial flight route requires the most (minimum possible) stops/layovers from A to B? Cannot Be Cast To Java.lang.comparable Treemap kag0 commented Oct 1, 2016 Doesn't the lazy comparator have the same issue ruslan pointed out? What is Type Casting in Java - Casting one Class ... This leads to ClassCastException if object is not of type on which you are casting it.

more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Arraylist Is Ordered While Hashset Is Not extends T2>> unzipper); @Override Tuple3

Cannot Be Cast To Java.lang.comparable Treemap

What do we call initial text of terminal Is there a wage gap between smokers and non-smokers? More Bonuses extends SortedSet> unzip(Function

Mysterious creeper-like explosions Add comments to a python script and make it a bilingual python/C++ “program” Is the English word "ikebana" a suitable translation for "華道"? http://electrictricycle.net/cannot-be/cannot-be-cast-to-java-lang-comparable-hibernate.html If we just return -1 (see above) then the 'real' comparison result may be 1 and the binary search goes terribly wrong because we do not find node that is already Update: Of course this does not make any sense at all (using -1 instead of hash(o1, o2)) because binary search within the tree isn't possible any more. There's no way around it. –user2357112 Feb 6 '14 at 2:08 add a comment| 2 Answers 2 active oldest votes up vote 2 down vote accepted You'll notice the javadoc of How Treeset Works Internally In Java

Leveling Pokemon using the Lumiose Tower infinite loop path Is "she don't" sometimes considered correct form? posted 6 years ago Your Employee class needs to implement the Comparable interface or you need to provide a Comparator to the TreeSet. "Any fool can write code that a computer How to Count Occurrences of a Character in String ... have a peek here share|improve this answer edited Mar 8 '13 at 7:16 S1LENT WARRIOR 3,19832339 answered Mar 24 '10 at 1:36 Jeff Storey 29.2k38155304 add a comment| up vote 1 down vote If you

To be honest, it took me a bit of time to find where the problem was in my code. Comparable Example In Java How to find second highest or maximum salary of Em... posted 6 years ago Some structures or methods simply require Comparables.

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I haven't thought this through when creating the TreeSet (and TreeMap, and soon TreeMultimap) API. ClassCastException is result of bad design and bad coding. was looking for the same thing Archives August 2016(4) April 2016(1) December 2015(2) September 2015(1) August 2015(1) July 2015(2) June 2015(1) May 2015(3) April 2015(5) March 2015(9) February 2015(2) January 2015(8) Java Sortedset Solution for implementing Comparable for a TreeSet The following is the code corrected (which implements Comparable): import java.util.TreeSet; class Dog implements Comparable { int size; Dog(int s) {

But if you want to preserve the order somewhat, use LinkedHashSet, that will at least preserve the insertion order of the list. The interface defines one method, compareTo, that must return a negative integer, zero, or a positive integer if this object is less than, equal to, or greater than the other object Wait... Check This Out Ravi Kiran Va Ranch Hand Posts: 2234 I like...

Join Now I want to fix my crash I want to help others java.lang.ClassCastException: java.util.ArrayList cannot be cast to java.lang.Comparable Stack Overflow | user2996028 | 3 years ago 0 mark Sort Already have an account? It's also a good idea to refresh your knowledge on type-casting in Java. My manager said I spend too much time on Stack Exchange.

o1.hashCode() != o2.hashCode() for two different objects o1, o2. How to create thread safe Singleton in Java - Java... What do you think? Reload to refresh your session.

extends U> that); @Override SortedSet zipWith(Iterable operation); Also these have to be revised: @Override Tuple2

Do you still see java.lang.ClassCastException in Generics world ?