#97 forEach Method in Java

Published: 18 January 2023
on channel: Telusko

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In this lecture we will learn:
forEach method in Java
What is a consumer interface?
Lambda expression with consumer object
How forEach method works?

#1
forEach method got introduced in Java 1.8 version.
The forEach() method of ArrayList is used to perform a certain operation for each element in ArrayList.
forEach traverses each element of the Iterable until all the elements have been processed.
Collection classes that extend the Iterable interface can use forEach loop to iterate elements.

#2
forEach method takes an object of the consumer.
Consumer is an interface that belongs to the java.util.function package.
Consumer is a functional interface so lambda expression will also be applicable to it.
Consumer has a method accept(), that takes a value of the same type of which object is created.

forEach needs an object and we will pass an object of a consumer in it.
forEach gives a value at a time and that value gets passed to the consumer object and taken by the accept method.
We can do operations in this accept method.

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