![]() ("Key : " + e.getKey() + " value : " + e.getValue())įor (Map.Entry entry : students. Students.entrySet().stream().forEach(e -> Value: Iterating Maps in Java: using stream() in JAVA 8 using values() for iteration over keys The addAll method uses an iterator to the existing Collection to iterate through the elements of the existing Collection and add each to the instance of the new. using keySet() for iteration over keys So, when only keys or values from the Map is required, you can iterate over keySet or values using for-each loops. Map.keySet() method returns a Set view of the keys contained in this Map and Map.values() method returns a collection-view of the values contained in the Map. Key : 3 value : Cathy Iterating over keys or values using keySet() and values() method using for-each loop This method is helpful when the number of entries is not known. Iterating over entries using For-Each loop Let us have a look at the different ways to iterate Maps in Java. We cannot iterate a Map directly using iterators, because Map is not Collection so we use some other ways to iterate Maps which are described in detail further in this blog. ![]() Each key can be mapped to at most one value. Once stored in a Map, you can later look up a particular value by using just the key of assigned to that value. a Java Map can store pairs of keys and values where each key is linked to a specific value. The Java Map interface,, represents the mapping between a key and a value i.e. What is a Map in JAVA?Ī Map is one of the most important Data Structures in Java. ![]()
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