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

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Options 1.) Hi 2.) No output 3.) Compile error 4.) Runtime error 5.) None of the above OCPJP 6 - 96% Currently working on Scala at Knoldus Software Sidharth Khattri posted 2 years ago Chan Ag wrote:Isn't the OCPJP exam either an OCPJO6 or an OCPJP7 or doesn't it say it is with respect to a particular version of Java? Is it possible to write division equation in more rows? 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. have a peek here

Suggested fix is to replace bad usages of TreeSet with HashSet. That allows me to technically create a SortedSet implementing class which uses the system hash code for ordering. Please notify vendor. share|improve this answer edited Jun 22 at 7:19 answered Jan 3 '13 at 5:39 rahulroc 7,86121737 Comparable is generic –user102008 Jan 7 '13 at 22:02 add a comment| up http://stackoverflow.com/questions/11012226/java-lang-classcastexception-resource-cannot-be-cast-to-java-lang-comparable

Cannot Be Cast To Java.lang.comparable Treeset

Join them; it only takes a minute: Sign up Why does TreeSet throws ClassCastException up vote 6 down vote favorite 2 In below code I am trying to add two employee Show Shannon Hickey (Inactive) added a comment - 2006-06-06 10:35 BT2:EVALUATION This bug results from an incorrect usage of TreeSet by Swing. Wouter Oet Saloon Keeper Posts: 2700 I like... Every thing works fine when i ad one element.

posted 6 years ago public class Format { public static void main(String args[]) throws Exception { Employee emp1 = new Employee(); emp1.setName("Ravi"); Employee emp2 = new Employee(); emp2.setName("Ravi"); Set set = Oracle Certified Professional: Java SE 6 Programmer && Oracle Certified Expert: (JEE 6 Web Component Developer && JEE 6 EJB Developer) Sidharth Khattri Ranch Hand Posts: 125 I like... Need a reason for this error Related 1852Cast int to enum in C#4Java: SortedMap, TreeMap, Comparable? Cannot Be Cast To Java.lang.comparable Priority Queue Add-in salt to injury?

How to use? -1 Exception: javax.swing.KeyStroke cannot be cast to java.lang.Comparable? share|improve this answer answered Jun 13 '12 at 9:46 amicngh 5,80521435 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign It appears that we've been lucky until now, when a change in TreeSet has revealed our error. http://stackoverflow.com/questions/15943031/why-does-treeset-throws-classcastexception new TreeMap(new Comparator() { public int compare(MyVertex o1, MyVertex o2) { } }); share|improve this answer answered Jan 3 '13 at 6:33 Kumar Vivek Mitra 25.2k52554 add a comment| Not

Save India From Corruption - Anna Hazare. Java Treemap Comparator Example Not the answer you're looking for? Thanks Wouter, it was nice explanation . 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

Cannot Be Cast To Java.lang.comparable Treemap

Can I get a dual entry Schengen visa for tourism purpose for me and my wife? There is nothing like a 'should have' though. Cannot Be Cast To Java.lang.comparable Treeset If TreeSet / TreeMap could be changed completely, they should have no public constructors but factory methods instead (the constructors become private): public static s = new TreeSet(new EmployeeComparator()); share|improve this answer edited Apr 11 '13 at

I didn't really need to use the TreeSet, however I agree I would have needed to implement comparable for if I used TreeSet. http://electrictricycle.net/cannot-be/cannot-be-cast-to-java-lang-comparable-set.html asked 3 years ago viewed 13584 times active 3 years ago Linked 0 ClassCastException with Java's TreeMap when using custom classes as the key -1 Java: Using TreeSet with a Class roles are not unfolded Install4j: Java(Tm) VM could not be started Worksheet name default when exporting to Excel? How to deal with a coworker that writes software to give him job security instead of solving problems? Treeset Comparable

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. Enter your search term here... Search Login or Signup to submit a new ticket Check ticket status Start a new topic Discussions DbVisualizer Forums Support DbVis 7.15 Does Not Run a anonymous started a topic over Check This Out TreeSet and TreeMap use sorting for their internal storage.

The mind is a strange and wonderful thing. Implement Comparable 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 I am getting the following error from Java: Exception in thread "main" java.lang.ClassCastException: graphvisualization.MyVertex cannot be cast to java.lang.Comparable at java.util.TreeMap.put(TreeMap.java:542) Here is the code associated with the error: SortedMap

Stack Trace: java.lang.ClassCastException: javax.swing.KeyStroke cannot be cast to java.lang.Comparable at java.util.TreeMap.compare(Unknown Source) at java.util.TreeMap.put(Unknown Source) at java.util.TreeSet.add(Unknown Source) at com.onseven.dbvis.K.F.ā(Z:2731) at com.onseven.dbvis.V.A.H$B.(Z:3492) at com.onseven.dbvis.V.A.H.(Z:210) at com.onseven.dbvis.V.C.բ(Z:348) at com.onseven.dbvis.V.C.թ(Z:732) at com.onseven.dbvis.V.C.(Z:3052) at

any object you add to TreeSet should implement Comparable interface. This should clue you in on what happens in your code sample. Assigning a unique representation to equivalent circular queues Are “Referendum” and “Plebiscite” the same in the meaning, or different in the meaning and nuance? Java Treeset Example Removing any of the constructors was not an option as it would break older code.

This should clue you in on what happens in your code sample. OCPJP 6 - 96% Currently working on Scala at Knoldus Software E Armitage Rancher Posts: 989 9 posted 2 years ago You must choose an answer according to the Javadocs Join them; it only takes a minute: Sign up cannot be cast to java.lang.Comparable up vote 19 down vote favorite 2 import java.util.HashMap; import java.io.*; import java.util.*; public class Fegan implements this contact form super K>,V> create() { return new TreeMap(); } public static create(Comparator

posted 2 years ago Guys? Comparable Check out the comparision and figure out when to use which. Install June 5th 2006 master nightly build, running swingset2 demo: java -jar SwingSet2.jar Under "Look & Feel" menu, switch to windows look and feel, you will get exception: (mustang b86 promoted I just don't want to make a mistake on the exam because of something I ignored, that's why I made this thread.

Hmmm. Employee cannot be cast to java.lang.Comparable is the problem. Heroku Gives me Error like "Push rejected, Unauthorized access." How did early mathematicians make it without Set theory? Regards Roger Comments to this discussion are now closed!

Which movie series are referenced in XKCD comic 1568? Leveling Pokemon using the Lumiose Tower infinite loop path Could I work as a Professor in Europe if I only speak English? How can I declare independence from the United States and start my own micro nation? 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).