Notice the use of keySet() on the end of elements. Each key name will then be place in this atomName String variable. ("Key : "+entry.getKey()+" Value : "+entry. Were setting up a string called atomName. Hm.entrySet().iterator().forEachRemaining(entry-> To iterate over the values, use: Iterator cells hashMap. As we have seen it earlier we can get the iterator of a Map through a Set package To iterate over a keySet, use: Iterator prisoners hashMap.keySet().iterator().The forEachRemaining() method is newly added to Iterator interface in Java 8. The method keySet() returns all key entries as a set object. Iterate a HashMap using Iterator.forEachRemaining() method Below example shows how to read add elements from HashMap. 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. Iterate through HashMap KeySet using Iterator ("Key : "+entry.getKey()+" Value : "+entry.getValue()) Iterator> entrySet = hm.entrySet().iterator() 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 didnât extend a Collection interface and hence it will not have its own iterator. Iterate through a HashMap EntrySet using Iterator 8 Best ways to Iterate through HashMap in Java Method 1.
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