Apr 18, 2025 · 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 this map. So, If you need only keys or values from the map, you can iterate over keySet or values using for-each loops.

Dec 16, 2024 · In this tutorial, we’ll look at the different ways of iterating through the entries of a Map in Java and write a benchmark test to determine the most efficient method. Simply put, we can extract the contents of a Map using entrySet (), keySet (), or values (). Since these are all sets, similar iteration principles apply to all of them.

In this guide, we covered various methods to iterate over a Map in Java. Each method has its own use cases and advantages: entrySet with For-Loop: Ideal for iterating over both keys and values. keySet with For-Loop: Best when only keys are needed. values with For-Loop: Useful for processing only values.

An effective iterative solution over a Map is a for loop from Java 5 to Java 7. Here it is: for (String key : phnMap.keySet()) { System.out.println("Key: " + key + " Value: " + phnMap.get(key)); } From Java 8, you can use a lambda expression to iterate over a Map. It is an enhanced forEach

May 24, 2019 · A Quick Guide to How To Iterate Map in Java. Iterating Through HashMap in Java 8 forEach(Stream API - Lamda Expression) With Example Programs and Explained in Different Ways.

Jun 17, 2021 · Java Map interface represents the mapping between a key and a value. Learn the different methods to iterate Maps in Java with examples.

Oct 3, 2023 · Within Java’s vast landscape, maps stand out as sophisticated repositories. These structures, unlike other collections, demand unique techniques for traversal. This article sheds light on a range of methods to navigate through Java maps, ensuring clarity and efficacy in your development process.

Jan 2, 2025 · The Stream API, introduced in Java 8, offers a functional and concise way to iterate over a Map. This approach is particularly useful for performing operations on the Map’s entries, keys, or values in a declarative style.

Jul 18, 2017 · Java Map API provides keySet(), valueSet() or entrySet() option to fetch content/data from the Map. The Map.entrySet method returns a collection-view of the map, whose elements are of this class. The only way to get a reference to a map entry is from the iterator of this collection view.

So, these are various ways of iterating a Map in Java: – Iterating using keySet() and values() method. Using For-Each loop over Map.entrySet(). Using Map.forEach and lambda Function. Iterators over Map.Entry<>. So, now we will explore each of the above methods one by one. Iterate Map using keySet() and values() method Java. Map.values ...