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How to prove that authentication system works, and that the customer is using the wrong password? up vote 0 down vote favorite So I'm trying to move all Strings of a certain length from a Collection of Strings (could either be a Set or a List) to ArrayList class does not implement java.lang.Comparable interface and the TreeMap is expecting the key to implement comparable interface. 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. http://rinfix.com/cannot-be/treemap-cannot-be-resolved-to-a-type.html

TSA broke a lock for which they have a master key. So in stead, you could just cast to the Map interface: public class Two extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Map map = (Map) getIntent().getExtras().get("map"); Should I report it? Try our newsletter Sign up for our newsletter and get our top new questions delivered to your inbox (see an example). see this

Cannot Be Cast To Java.lang.comparable Treeset

Do we know Ford's old name? Do the Leaves of Lórien brooches have any special significance or attributes? This is not my case. Comparable Check out the comparision and figure out when to use which.

  1. So on the receiving end (Two) do something like: public class Two extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); TreeMap map = new TreeMap((Map) getIntent().getExtras().get("map"));
  2. extends E> c) { return new TreeSet(c); } public static create(SortedSet s) { return new TreeSet(s); } // not too sure if this is guaranteed to be safe...public static
  3. private Set keyRinger(String current) { Set keyRing = new TreeSet(); for (int i = 0; i < current.length(); i++) { char key = current.charAt(i); keyRing.add(key); } return keyRing; } So my
  4. How can I open the next/previous file alphabetically?
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  7. What is the significance of the robot in the sand?

That would still be a possible type safety problem waiting to happen. Can a president win the electoral college and lose the popular vote Does Intel sell CPUs in ribbons? Because every element in a set much be unique, any object must be compared with the objects in the set already before it is added. 1. Cannot Be Cast To Java.lang.comparable Priority Queue US Election results 2016: What went wrong with prediction models?

Is it possible for a diesel engine computer to detect (and prevent) a runaway condition? Teenage daughter refusing to go to school How to capture disk usage percentage of a partition as an integer? Assembler for CPU Find a mistake in the following bogus proof Previous examples of large scale protests after Presidential elections in US? http://stackoverflow.com/questions/21592485/what-causes-the-classcastexception-java-util-treeset-cannot-be-cast-to-java-lan Not the answer you're looking for?

Comparable

Treemap Comparable Example

Not the answer you're looking for? http://stackoverflow.com/questions/24674178/treemap-entry-converted-to-string-types-fails You have method compareTo(); so just add implements Comparable to your class MyVertex . Cannot Be Cast To Java.lang.comparable Treeset I've read I need a Comparator or to implement Comparable but I don't know how to do that, and I think there might be a simpler solution (although perhaps not as Treeset Comparable Example Take a tour to get the most out of Samebug.

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Please help me to find out the cause and suggest me the solution. So your key element in your TreeMap must implement Comparable. You need to create a class that implements this interface and provide an instance of it to your TreeMap constructor expression. Do we know Ford's old name? Java Treemap Comparator Example

Vent kitchen hood vent to roof turbine vent? Can you think of a possible workaround? –Josh M Nov 8 '13 at 12:24 1 A Multimap stores collections of values. What is the significance of the robot in the sand? Check This Out share|improve this answer answered Dec 19 '12 at 20:05 dmon 25.1k56179 When you put anything that implements the Map interface into a Bundle, it comes out as a HashMap.

Using the eval command twice What is the significance of the robot in the sand? Java Implement Comparable How do you think it's going to compare two instances of ArrayList? It's good to know that a plain HashMap is supported, though. –dmon Dec 19 '12 at 21:46 add a comment| up vote 0 down vote Instead of casting the result directly

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Build me a brick wall! 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 Hence it is causing the exception. Comparable Interface Java add a comment| 5 Answers 5 active oldest votes up vote 11 down vote accepted How do I get MyVertex types to be casted to Comparables?

That would not require a comparator (so comparator() returns null) but the elements are still not Comparable. share|improve this answer answered Nov 8 '13 at 12:28 steffen 5,32711243 add a comment| up vote 1 down vote The error itself indicates the problem. How to handle a common misconception when writing a Master's thesis? For example to print all the Strings in the Map just do: for (Entry entry: garMap.entrySet()) { System.out.println(entry.key() + " : " + entry.value() + "."); } If you do:

Word for a Fact Believed by a Sub-Culture Why does Cutie act like this and lesser robots listen to it? Can a president win the electoral college and lose the popular vote Assigning only part of a string to a variable in bash Basic Geometric intuition, context is undergraduate mathematics In How would I call that in this code? –Mxt Feb 6 '14 at 2:11 @Mxt Comparator is an interface. You can add only one element into TreeSet which does not implement Comparable because it does not need to be compared with other elements.

Are keywords in resolv.conf case sensitive? Comparator in Java Sort LinkedList of User-Defined Objects in Java Category >> Collections If you want someone to read your code, please put the code inside

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This is spelled out in the documentation for SortedSet: All elements inserted into a sorted set must implement the Comparable interface (or be accepted by the specified comparator). Hmmm. I understand that the elements of my two TreeMap objects are of "Map Entry" type and cannot be converted to "String" type, is that correct? Symmetric group action on Young Tableaux How to capture disk usage percentage of a partition as an integer?

Teenage daughter refusing to go to school Why dd takes too long? more hot questions question feed lang-java about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Not the answer you're looking for? 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

share|improve this answer answered Apr 11 '13 at 7:33 Martin V. 1,13331631 Is implementation of comprable Interface mendatory? –Rais Alam Apr 11 '13 at 7:36 @FireFly: No, super E> comparator) { return new TreeSet(comparator); } public static

I wrote the following code to do these 3 tasks: public class TryTask_A_copy { public static void main(String[] args) { // First collection: TreeMap garList = new TreeMap<>(); // Second TreeSet vs.