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Cannot Be Cast To Java.lang.comparable At Java.util.treemap.putunknown Source


Constructor Chaining in Java - Calling one constru... Wouter Oet Saloon Keeper Posts: 2700 I like... How to Create and Evaluate XPath Expression in Jav... So, I tried compiling using java -source 1.6, but got the same output, ClassCastException/NullPointerException even though I added only one element/key to the Set/Map. Source

Your compareTo implementation should describe how a Fegan compare to another Fegan. It can be best explained with an example. Just note that the Freshdesk service is pretty big on some cookies (we love the choco-chip ones), and some portions of Freshdesk may not work properly if you disable cookies. public class MyVertex implements Comparable { @Override public int compareTo(MyVertex o) { // do the comparison logic } } Other option is to pass a Comparator Object to TreeMap http://docs.oracle.com/javase/1.5.0/docs/api/java/util/TreeMap.html#TreeMap(java.util.Comparator) share|improve http://stackoverflow.com/questions/8699195/cannot-be-cast-to-java-lang-comparable

Cannot Be Cast To Java.lang.comparable Treeset

Thanks, Jeff 2 CommentsOldest FirstPopularNewest FirstSorted by Oldest First Hans Bergsten said over 3 years ago [This reply is migrated from our old forums.]Re: DbVis 7.15 Does Not RunHi Jeff, Java We’ll also assume you agree to the way we use cookies and are ok with it as described in our Privacy Policy, unless you choose to disable them altogether through your As in the above example.

How to create auto incremented identity column in ... share|improve this answer edited Jan 2 '12 at 9:44 answered Jan 2 '12 at 9:32 plus- 20.1k104166 add a comment| Your Answer draft saved draft discarded Sign up or log 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. Cannot Be Cast To Java.lang.comparable Priority Queue What is exactly meant by a "data set"?

Hide Permalink Brent Christian added a comment - 2006-06-06 13:12 BT2:EVALUATION I found the following references ot TreeSet in javax.swing and com.sun.java.swing.plaf: 1) ./JDesktopPane.java(26): import java.util.TreeSet; ./JDesktopPane.java(329): Set set = new Cannot Be Cast To Java.lang.comparable Treemap Here are some of the most frequently occurred ClassCastException in Java: java.lang.classcastexception java.lang.string cannot be cast to java.lang.integer This will come when you try to cast String object to Integer i.e. Comparator vs. http://stackoverflow.com/questions/14133600/java-cannot-cast-to-comparable-when-using-treemap A carefully designed program will never see ClassCastException.

Thanks. Treeset With Comparator What is Object in Java Programming and OOPS - Exam... share|improve this answer answered Jan 3 '13 at 5:38 assylias 177k26339490 last note is interesting –Subin Jan 3 '13 at 5:46 add a comment| up vote 5 down vote It appears that we've been lucky until now, when a change in TreeSet has revealed our error.

Cannot Be Cast To Java.lang.comparable Treemap

Also write your own classes and method to take advantage of Generics to provide type-safety as shown in this example of How to write parameterized class. More about the author More topics in Support Forward Engineering DB2 Database Connection Dropping every 20-30mins or so ? Cannot Be Cast To Java.lang.comparable Treeset Browse other questions tagged java or ask your own question. Cannot Be Cast To Java.lang.comparable Java Why put a warning sticker over the warning on this product?

DbVis Software Welcome Login Sign up Home Solutions Forums Users Guide Release Notes How can we help you today? http://electrictricycle.net/cannot-be/cannot-be-cast-to-java-lang-comparable-set.html TreeSet and TreeMap use sorting for their internal storage. For instance, don't use:Set set = new TreeSet()Use this instead:Set set = new TreeSet()This has nothing to do with your problem, but it's good practice to get used to. posted 2 years ago Chan Ag wrote:If I got this question in the SCJP exam, I would choose option 3 - Compile error. Treeset Comparable

super E> comparator) { return new TreeSet(comparator); } public static have a peek here How to Count Occurrences of a Character in String ...

Is it unethical to poorly translate an exam from Dutch to English and then present it to the English speaking students? Implement Comparable extends V> m) { return new TreeMap(m); } // not too sure if this is guaranteed to be safe...Apart from not being able to create a TreeSet without a Comparator, it Making a large file using the terminal Is it possible to bleed brakes without using floor jack?


Common source of java.lang.ClassCastException Following are some of the most common source of ClassCastExcepiton in Java: 1. java.lang.classcastexception java.util.arraylist cannot be cast to java.util.mapjava.lang.classcastexception ljava.lang.object cannot be cast to ljava.lang.comparablejava.lang.classcastexception ljava.lang.object cannot be cast to ljava.lang.integerjava.lang.classcastexception ljava.lang.object cannot be cast to java.util.listjava.util.arraylist cannot be cast to java.lang.comparable The original author name has been removed]Re: DbVis 7.15 Does Not RunThanks, Hans. Java.lang.classcastexception Ljava.lang.object Cannot Be Cast To Is there a wage gap between smokers and non-smokers?

Browse other questions tagged java exception collections set treeset or ask your own question. How to find second highest or maximum salary of Em... This should clue you in on what happens in your code sample. Check This Out How to read input from command line in Java using ...