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Questions tagged [entryset]

32 questions
20
votes
3 answers

Stream Vs. Iterator in entrySet of a Map - Java 8

To my understanding, the following code should have print true, since both Stream and Iterator are pointing to the first element. However, when I ran the following code it is printing false: final HashMap map = new…
T-Bag
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19
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6 answers

Iterating over a map entryset

I need to iterate over the entry set of a map from which I do not know its parameterized types. When iterating over such entryset, why this does not compile ? public void myMethod(Map anyMap) { for(Entry entry : anyMap.entrySet()) { ... …
Sergio
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7
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2 answers

Printing HashMap of HashMaps : Map.Entry or java8

I have a method which returns out hashmap of hashmaps HashMap> mapofmaps = abcd(, ); I am trying to print the the outer hashmap using the following code for (Entry>…
Betafish
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7
votes
4 answers

Under what scenario Map.Entry returned by map.entrySet will be NULL

I came across a code snippet which iterates over a map using its entry set and performs some action only if entry != null As far as I know even if we don't enter anything in map map.entrySet returns an empty set and not null. Even if I put…
Abhinav
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6
votes
3 answers

How to get the 3 highest values in a HashMap?

I have a hashmap which is the following: HashMap hm = new HashMap; hm.put("a", 1); hm.put("b", 12); hm.put("c", 53); hm.put("d", 2); hm.put("e", 17); hm.put("f", 8); hm.put("g",…
shadwphenixx
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4
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1 answer

Performance - Inefficient use of keySet iterator instead of entrySet iterator

This piece of code throws the error This method accesses the value of a Map entry, using a key that was retrieved from a keySet iterator. It is more efficient to use an iterator on the entrySet of the map, to avoid the Map.get(key) lookup. Kindly…
Arun
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3
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1 answer

The Set returned from HashMap.entryset(), how is it sorted?

I need to replicated the sorting I get on a set returned from the function entrySet() from the HashMap class. I don't understand how it is sorted. The following code: HashMap testList = new HashMap
fruktprins
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2
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4 answers

add() method on entrySet() in Map<>

While iterating Map<> using for loop for(Map.Entry mapEntry : myMap.entrySet()){ // something } I found entrySet() method returns a set of Entry so it has add(Entry e) method then I created a class which implements Map.Entry…
Seethend Reddy
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2
votes
3 answers

From "Map>" to "Map>" using Java 8

Is there a better way to transform "Map>" to "Map>"? Map> collectionsMap = ... Map> listsaps = collectionsMap.entrySet().stream() …
Romain DEQUIDT
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2
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1 answer

Why Java 6 overrides keySet(), entrySet() and values() interface in SortedMap

Java 5 http://docs.oracle.com/javase/1.5.0/docs/api/java/util/SortedMap.html Java 6 https://docs.oracle.com/javase/6/docs/api/java/util/SortedMap.html As you can see that since Java 6, these three apis are overridden. Can anyone tell me what's the…
Jiaguo Fang
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2
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2 answers

How to make entrySet() show key-value pairs on new line?(java)

I have a long Map (int, int[] ) ; I use map.entrySet() and it returns me the Set view of my map Map >res = function() ; System.out.println( res.entrySet() ) ; i want to show every entry on new line: [1=[1, 47, 432,…
ERJAN
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1
vote
1 answer

Retrieving Values from having a particular property from a Map using Java 8 Stream

I have a class UserCourseEntity with a property userId @AllArgsConstructor @Getter @ToString public static class UserCourseEntity { private String userId; } And I have a map with UserCourseEntity objects as values. public final Map
Yugandhar
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1
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1 answer

Java - Serializing Iterable> with Gson

I trying to serialize an "Iterable" from type Map.Entry with google GSON library - and i got an empty output. here an example of the code: static private Iterable> getIterable(){ HashMap map = new…
Eyal leshem
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0
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1 answer

Sorting a entrySet by keys

In my entrySet I have the next values: name -> "someName" nameSpace -> "someNameSpace" version -> "someVersion" I'm iterating over this entrySet and adding its values to a final object, my problem is that I need to add the values in the…
rasilvap
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0
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0 answers

Sorting HashMap which does not maintain insertion order?

In an interview I was asked to sort HashMap by values. Even after I write such a program, it does not print the HashMap in sorted order. Can someone please explain? public static void main(String[] args) { HashMap x= new…
Prabhat Gaur
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