![]() ![]() Hm.entrySet().iterator().forEachRemaining(entry-> As we have seen it earlier we can get the iterator of a Map through a Set package The forEachRemaining() method is newly added to Iterator interface in Java 8. Iterate a HashMap using Iterator.forEachRemaining() method ![]() The forEach() method of the HashMap takes up the BiConsumer functional interface as the argument and hence we can pass it a lambda expression that takes two inputs as argument key and value package Iterating through a HashMap using Lambda Expressions Iterate a HashMap using For-each Loop package The for-each loop (or) enhanced for loop in Java will invoke the iterator() method internally. entrySet() method returns Set interface, Set interface extends the Collection interface which in turn extends the Iterable Interface. The For-Each loop is available for all the classes which implement the Iterable interface. Iterator keySetIterator = hm.keySet().iterator() Since it is a Set again we can use the Iterator to iterate it. The keySet() method returns the Set of all the Keys in the HashMap. If the specified key is not already associated with a value (or is mapped to null ), attempts to compute its value using the given mapping function and. Iterate through HashMap KeySet using Iterator ("Key : "+entry.getKey()+" Value : "+entry.getValue()) Iterator> entrySet = hm.entrySet().iterator() To iterate through hashtable in java, first we have to get all keys as set object and then fetch each element using key. Now we can get the key-value pair easily using the getKey() and getValue() method. entrySet() returns a Set and a Set interface which extends the Collection interface and now on top of it, we can use the Iterator. Map interface didn’t extend a Collection interface and hence it will not have its own iterator. HashMap is called an associative array or a dictionary in other programming languages. Java HashMap HashMap is a container that stores key-value pairs. Iterate through a HashMap EntrySet using Iterator last modified JanuHashMap iteration in Java tutorial shows how to iterate over a HashMap in Java. 8 Best ways to Iterate through HashMap in Java Method 1.
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