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Java Hashmap Containskey String Not Working

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On Tate's "Endomorphisms of Abelian Varieties over Finite Fields", sketch of proof of main result? If a name appears multiple times, I want to do something to the first Item with that name. Oh, it's empty -- return false. The reason why get(Object) is working is, that HashMap will calculate the Hash for your Location class and returns the Object the hascode points to. this contact form

Browse other questions tagged c# .net or ask your own question. Worse as a key for a map: there is no way to have more than one key-value pair in the map since there are no distinct keys. (maybe useful for testing) Does the Rothschild family own most central banks? The hashCode() method should be implemented carefully. http://stackoverflow.com/questions/1104030/java-hashmap-get-works-but-containskey-does-not

Java Hashmap Containskey String Not Working

up vote 0 down vote Hashmap actually works on the principal of hashing. Try our newsletter Sign up for our newsletter and get our top new questions delivered to your inbox (see an example). but the else case is never executed. –Marcel B Dec 7 '09 at 17:59 2 Is String in this case a java.lang.String or a badly named class with no equals

Stay logged in Bukkit Forums Home Forums > Bukkit > Plugin Development > Home Home Quick Links Recent Activity What's New? Wrong way on a bike lane? For example: using System; using System.Collections.Generic; class Program { static void Main(string[] args) { var d = new Dictionary(new MyComparer()); d.Add(new Key("A"), 1); Console.WriteLine(d.ContainsKey(new Key("a"))); Console.ReadLine(); } private class MyComparer Hashmap Containskey Complexity Bingo.

Did Trump call Belgium a village in Europe? Containskey Java Example Without doing that, you get the default implementation of both. And who are »they«? http://stackoverflow.com/questions/2197678/dictionary-containskey-not-working-as-expected Why is looping over find's output bad practice?

Citing work with a publication year in the future Has a movie ever referred to a later movie? Hashmap Containsvalue If the name property of a Foo defines it's identity (and you properly implemented hashCode() and equals()) you should use R. I disagree about { at the end of the line, but have a look at these conventions. Your code contains lots of lines that are far too long, and it makes things very difficult to read; I suggest you split them up if you want people to answer.

Containskey Java Example

c# .net share|improve this question asked Feb 4 '10 at 6:08 Nippysaurus 9,1971560109 is YMD a class or a struct? –Mitch Wheat Feb 4 '10 at 6:11 http://stackoverflow.com/questions/3014945/dictionary-containskey-return-false-but-a-want-true Us old farts don't like ploughing through enormously long lines; it hurts our eyes and fries our brains. Java Hashmap Containskey String Not Working I'm not sure why it's working now ... Hashmap Containskey Equals Why (and when) does pattern matching with f[__] perform MUCH more quickly than _f?

How do unlimited vacation days work? http://zenlinux.org/not-working/javascript-not-working-in-firefox-but-working-in-chrome.html asked 7 years ago viewed 33732 times active 1 year ago Upcoming Events 2016 Community Moderator Election ends in 10 days Linked 2 java HashMap containsKey is returning false though key Not the answer you're looking for? MathSciNet review alert? Java Hashmap String Key Not Found

And yes, that means such objects can’t be stored in Dictionaries. I made a test to find out what is happening and here it is : HashMap test = new HashMap(); test.put(new Coord(3, 3), new Coord(0, 0)); System.out.println("HashMap test for How to find limit of function. navigate here Not the answer you're looking for?

Also, here is the Coord class : public class Coord { public float x, y; public Coord(float a, float b) { this.x = a; this.y = b; } @Override public boolean C# Dictionary Containskey String Not Working The case of the Maid, the Son and the Butler "president-elect" grammatically correct? For example somewhere in debug window you set expression which changes your fields object or bean object.

If there's only one entry in the map, this is of course guaranteed.

share|improve this answer answered Jun 10 '10 at 13:49 Mitch 4061417 1 Careful – Dictionary is implemented in terms of a hash map so (unlike SortedDictionary and SortedList) implementing IComparable Browse Core Curse MMO-Champion WowStead CurseForge WowAce SkyrimForge SC2Mapster LoLPro ExilePro Bukkit Forums Community Minecraft Forum Terraria Online Arena Junkies Guild Wars 2 Guru DiabloFans FPS General DarthHater Defiance Forum Wildstar When I fixed them, all has started to work properly :$ –agad Feb 6 '14 at 13:35 @agad How and why? –Mingliang LIU Feb 6 '15 at 0:15 add Java Hashmap Get Value Can a giant spoon be utilised as a weapon Is there a way to block an elected President from entering office?

Join them; it only takes a minute: Sign up Java HashMap get works but containsKey does not up vote 11 down vote favorite 3 I am trying to locate a key Physics of Ice books 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 / Fixed the tags. his comment is here you have not overridden hashCode() method.

Is adding the ‘tbl’ prefix to table names really a problem? Making A Solid Mesh Melt? Join them; it only takes a minute: Sign up Dictionary.ContainsKey() not working as expected up vote 4 down vote favorite 2 I have a dictionary. What do you mean length of lines.

Why did they look stupid? Edit : I found the extract of javadoc in Map : Note: great care must be exercised if mutable objects are used as map keys. java hashmap share|improve this question edited Dec 7 '09 at 17:57 pjp 9,42122248 asked Dec 7 '09 at 17:46 Marcel B 1,62511632 Are you sure that you have duplicated umlaute not rendered correctly with lualatex My cat sat on my laptop, now the right side of my keyboard types the wrong characters What is this line of counties voting for

Can someone helps troubleshoot this. I KNOW the key is present in the Map but it keeps returning false. So containsKey() giving a false But while you are doing a.equals(new Coord(3, 3)) you are calling overriden equals() which is satisfying the conditions you have put in your overridden method, which You don’t only have to think about Length of lines here; if you go for a job and have to hand in a printout of some of your work, lines that

How to prove that authentication system works, and that the customer is using the wrong password? Teenage daughter refusing to go to school Why is "Try Again" translated to やり直す? I just added another variable in this new key class, and now it wont work. Previous examples of large scale protests after Presidential elections in US?

Browse other questions tagged java hashmap contains or ask your own question. How can I ensure my Playstation 2 will last a long time? Is RandomGraph really random? posted 4 years ago If two objects are equal, they must produce the same hash code.

Help Forums Forums Quick Links Members Staff Search Forums What's New? Dealing With Dragonslayers What is this line of counties voting for the Democratic party in the 2016 elections? I immediately thought my comparison functions must be broken, but after writing unit tests for all of them it does not appear to be the case.