As we have seen it earlier we can get the iterator of a Map through a Set package Note : If we use for-each loop dont forgot to check if the Map is not null. The forEachRemaining() method is newly added to Iterator interface in Java 8. Method 1 : Java 8 forEach method Method 2: Looping by getting Entries of Map. 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. Iterate through HashMap KeySet using Iterator ('Key : '+entry.getKey()+' Value : '+entry.getValue()) The HashMap can be iterated over with the forEach() method. Iterator> entrySet = hm.entrySet().iterator() The forEach() is a new method introduced in Java 8 to iterate over collections. Using lambda expression to iterate over a hashmap is a compact and efficient way to perform some operation on. Now we can get the key-value pair easily using the getKey() and getValue() method. Iterate HashMap with Lambda Expression in Java 8. entrySet () returns a Set and a Set interface which extends the Collection interface and now on top of it, we can use the Iterator. entrySet() returns a Set and a Set interface which extends the Collection interface and now on top of it, we can use the Iterator. Iterate through a HashMap EntrySet using Iterator Map interface didn’t extend a Collection interface and hence it will not have its own iterator. Map interface didn’t 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.

Java for loop hashmap