#97 forEach Method in Java

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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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