Written by Pauline Lafleur Jul 22, 2022 · 3 min read
List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);<br> List<Integer> result = numbers.stream().map(x -> x * 2).collect(Collectors.toList());
Table of Contents
10 Examples of Stream in Java 8 count + filter + map + distinct from www.java67.com
Introduction
Java 8 introduced several new features, one of which is the Stream API. With Stream API, it is possible to perform operations on collections in a concise and readable way. Another feature introduced in Java 8 is the Map function, which can be used to transform data. In this article, we will discuss how to use Stream with Map in Java 8.
What is Stream API?
Stream API is a new feature introduced in Java 8, which allows us to perform operations on collections in a concise and readable way. It provides a functional programming approach to process collections of objects.
What is Map?
Map is a function in Java 8, which can be used to transform data. It takes a function as an argument and applies it to each element in the collection, returning a new stream with the transformed elements.
Using Stream with Map
To use Stream with Map, we first need to create a Stream object from a collection. We can then apply the Map function to the Stream, passing a function as an argument. Let's consider an example. Suppose we have a collection of integers, and we want to multiply each element by 2. We can use Stream with Map to achieve this in a concise and readable way. Here's the code:
List numbers = Arrays.asList(1, 2, 3, 4, 5); List result = numbers.stream().map(x -> x * 2).collect(Collectors.toList());
In the above code, we first create a list of integers. We then create a Stream object from the list using the stream() method. We apply the Map function to the Stream, passing a lambda expression as an argument. The lambda expression takes an integer as input and returns the integer multiplied by 2. Finally, we collect the transformed elements into a new list using the collect() method.
Benefits of using Stream with Map
Using Stream with Map has several benefits. It allows us to write concise and readable code, reducing the chances of errors. It also makes it easier to parallelize operations on collections, resulting in faster execution times.
Conclusion
In this article, we discussed how to use Stream with Map in Java 8. We saw how to transform data in a concise and readable way using the Map function. We also discussed the benefits of using Stream with Map. By using Stream with Map, we can write more efficient and maintainable code.
Question & Answer
Q: What is Stream API?
A: Stream API is a new feature introduced in Java 8, which allows us to perform operations on collections in a concise and readable way.
Q: What is Map?
A: Map is a function in Java 8, which can be used to transform data. It takes a function as an argument and applies it to each element in the collection, returning a new stream with the transformed elements.
Q: What are the benefits of using Stream with Map?
A: Using Stream with Map allows us to write concise and readable code, reducing the chances of errors. It also makes it easier to parallelize operations on collections, resulting in faster execution times.
