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1. docs.oracle.com › javase › 8HashMap (Java Platform SE 8 ) - Oracle

   docs.oracle.com › javase › 8

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   public Set<Map.Entry<K,V>> entrySet() Returns a Set view of the mappings contained in this map. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa.

   • Hashtable

     Returns a Set view of the keys contained in this map. The...

   • Package

     The Calendar class is an abstract class that provides...

   • Map

     An object that maps keys to values. A map cannot contain...

   • Collection

     Ensures that this collection contains the specified element...

   • Set

     A collection that contains no duplicate elements. More...

   • Hashset

     Iterating over this set requires time proportional to the...

   • LinkedHashMap

     Parameters: eldest - The least recently inserted entry in...

   • Java.Util Class Hierarchy

     Hierarchy For Package java.util Package Hierarchies: All...

2. www.geeksforgeeks.org › java-util-hashmap-in-java-with-examplesHashMap in Java - GeeksforGeeks

   www.geeksforgeeks.org › java-util-hashmap-in-java-with-examples

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   4 Οκτ 2024 · The java.util.HashMap.keySet() method in Java is used to create a set out of the key elements contained in the hash map. It basically returns a set view of the keys or we can create a new set and store the key elements in them. Syntax: hash_map.keySet() Parameters: The method does not take any parameter. Return Value: The method returns a set havin

3. www.w3schools.com › java › java_hashmapJava HashMap - W3Schools

   www.w3schools.com › java › java_hashmap

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   Loop through the items of a HashMap with a for-each loop. Note: Use the keySet() method if you only want the keys, and use the values() method if you only want the values:

4. www.geeksforgeeks.org › hashmap-class-methods-java-examples-set-1-put-get-isHashMap Class Methods in Java with Examples | Set 1 (put(), get...

   www.geeksforgeeks.org › hashmap-class-methods-java-examples-set-1-put-get-is

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   16 Μαρ 2023 · keySet(): java.util.HashMap.keySet() returns a Set containing all the keys in the HashMap. Syntax: public Set<K> keySet() Return: A Set view of the keys contained in this map.

5. www.geeksforgeeks.org › hashmap-methods-java-examples-set-2-keyset-valuesHashmap methods in Java with Examples | Set 2 (keySet(), values...

   www.geeksforgeeks.org › hashmap-methods-java-examples-set-2-keyset-values

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   14 Οκτ 2019 · .entrySet() : java.util.HashMap.entrySet() method returns a complete set of keys and values present in the HashMap. Syntax: public Set<Map.Entry> entrySet() Return: complete set of keys and values

6. stackoverflow.com › questions › 1885313java - Using the keySet () method in HashMap - Stack Overflow

   stackoverflow.com › questions › 1885313

   From Javadocs HashMap has several methods that can be used to manipulate and extract data from a hasmap. public Set<K> keySet() Returns a Set view of the keys contained in this map. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa.

7. www.baeldung.com › java-hashmapA Guide to Java HashMap - Baeldung

   www.baeldung.com › java-hashmap

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   11 Μαΐ 2024 · Java 8 added several functional-style methods to HashMap. In this section, we’ll look at some of these methods. For each method, we’ll look at two examples. The first example shows how to use the new method, and the second example shows how to achieve the same in earlier versions of Java.