Home > Type Mismatch > Type Mismatch Cannot Convert From Hashmap To Map

Type Mismatch Cannot Convert From Hashmap To Map

My cat sat on my laptop, now the right side of my keyboard types the wrong characters I am seen in darkness and in light, What am I? Could you tell me where my understanding is messed up? –Poornima Prakash Feb 15 '12 at 12:04 @Poornima Prakash What you've actually created is an ArrayList of HashMap. extends Animal> animals) { Map> groupedMap = new HashMap>(); List tempList = null; for (Animal summary : animals) { String consolidatedInvoiceId = summary.getOwner(); tempList = groupedMap.get(consolidatedInvoiceId); if (tempList == I have a list of "Cat" objects and a list of "Dog" objects that I need to pass into the same method. http://bovbjerg.net/type-mismatch/type-mismatch-cannot-convert-from-element-type-object-to-map-entry.php

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 Safety - Improve braking power in wet conditions Why do some banks have more than one routing number in the US? Vent kitchen hood vent to roof turbine vent? extends Map> declaration basically means "a list of some Map objects, whose specific types are unknown".

extends List, V> multiMap= new HashMap,V>(); share|improve this answer answered Sep 5 '11 at 9:07 Jean Logeart 33.7k93469 add a comment| up vote 2 down vote This is because a Map First Name Please enter a first name Last Name Please enter a last name Email We will never share this with anyone. extends Map>, List

Please click the link in the confirmation email to activate your subscription. In last example you know map type, so entrySet returns correct typed Set and you can iterate without any type conventions. asked 1 year ago viewed 218 times active 1 year ago Related 60Why declare final variables inside methods?6Why can't I implement an interface which has a bounded generic type in this That doesn't mean a B is type-assignable to an A though. –Mark Peters Aug 22 '11 at 6:19 add a comment| up vote 3 down vote Because a Map

Does an Eldritch Knight's war magic allow Extra Attacks? As other posts have suggested , you have to use List as your type in the HashMap type parameters. Can I sell a stock immediately What is the meaning of ''cry oneself"? http://stackoverflow.com/questions/7305913/private-maplistk-v-multimap-new-hashmaparraylistk-v How can I save a file to a new location from inside Vim?

I am seen in darkness and in light, What am I? Comments with solutions will be removed and commenters will automatically be banned for a week. Can an object *immediately* start moving at a high velocity? But I make the java.awt.List mistake a lot too. –Mark Peters Aug 22 '11 at 6:26 add a comment| up vote 3 down vote In Java , Generics does not preserve

Browse other questions tagged java generics generic-list or ask your own question. http://stackoverflow.com/questions/29312243/how-to-cast-a-hashmap-to-map Jul 13 '15 at 2:15 add a comment| up vote 1 down vote Make what you're instantiating concrete (HashMap), but keep the generic type abstract. What you're doing is equivalent to: List animals = new ArrayList(); If this were allowed, then you would be able to do something like: List catsOnly = new ArrayList(); List animals Why were pre-election polls and forecast models so wrong about Donald Trump?

But in this case, the solution AlexR should work, right ? navigate here Subscribe to our monthly newsletter for tech news and trends Membership How it Works Gigs Live Careers Plans and Pricing For Business Become an Expert Resource Center About Us Who We How do I make an alien technology feel alien? Why aren't Java's generics implicitly polymorphic?

Covered by US Patent. Can proliferate be applied to loyalty counters? This is not the issue of wrong name. –Rohit Jain Feb 18 '13 at 10:23 yes the name of the map was a typo, corrected already, sorry –Sergio Feb Check This Out Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the

Concretely , if LinkedList is a subtype of List , that does not imply that Map is a subtype of Map. 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 No illegal/pirated content!

share|improve this answer edited Feb 18 '13 at 10:43 answered Feb 18 '13 at 10:20 Leonidos 8,60621529 add a comment| up vote 1 down vote the first code snippet wont compile

I'm trying to get into the habit of specifying interfaces instead of exact types. use below one instead for(Entry entry:lshPSD.entrySet()) and access entry.getKey if you wnt to use the key value to be passed then dont use entryset, use for each like below for(Object obj Join them; it only takes a minute: Sign up Iterating over a map entryset up vote 13 down vote favorite 2 I need to iterate over the entry set of a You cannot up cast a generic like you can with a regular expression. –Peter Lawrey Sep 5 '11 at 9:09 Where the answers helpful?

You can keep the declaration of the map the same, just change the return type of the function –testinfected Mar 28 '15 at 0:51 anyway thank you , i 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 Bad title: I'm new to Java and need help. this contact form Is it possible to sheathe a katana as a free action?

up vote 4 down vote favorite I tried to write the following: public class AdjacencyList { Map>> adj = new HashMap>>(); } But I get the error: Type mismatch: You are doing an unchecked cast to get Set back into a Set. Take yourself to another level. Lines getting the error in title: catMap = PetStore.groupAnimalsByOwner(cats); dogMap = PetStore.groupAnimalsByOwner(dogs); Note: this is a simplified example, I have to be able to use the Lists in the Maps as

Do the Leaves of Lórien brooches have any special significance or attributes? Recorded Future allows analysts to observe structured data on the open, deep, and dark web. My boss asks me to stop writing small functions and do everything in the same loop Is it possible to check where an alias was defined? Join them; it only takes a minute: Sign up Type mismatch: cannot convert from element type Object to Map.Entry up vote 0 down vote favorite public HashMap lshPSD = new

public void myMethod(Map anyMap) { for(Entry entry : anyMap.entrySet()) { ... } } but this compile: public void myMethod(Map anyMap) { Set entries = anyMap.entrySet(); for(Entry entry : entries) { ... Which then causes the Iterator to just be working from Objects. –Mr Spoon Jun 16 '15 at 15:07 add a comment| up vote 2 down vote It is because you use Is it possible to hand start modern planes? Is there a way to block a President Elect from entering office?

All rights reserved. I am getting syntax error as below org.apache.jasper.JasperException: Exception in JSP: /update.jsp:46 43: RequestDispatcher view = 44: request.getRequestDispatcher("result.jsp"); 45: //--Use the request dispatche to ask the container to crank JSP 46: What is the significance of the robot in the sand?