Скачать или смотреть #98 Stream API in Java

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In this lecture we will learn:
What is a stream?
Methods present inside the stream interface
Filter, Map and Reduce methods of stream
Use of methods in Big Data

#1
Stream is an interface, it contains a stream() method.
Stream method return an object of type stream.
Any operation can be performed inside the stream method.
Any changes done inside the stream can be reflected on the actual list.
Once we work with a stream, we can't reuse it. We can work with a stream only once.

#2
Stream provides a lot of methods to work upon.
filter() method returns a new Stream that contains the value which satisfies the given condition. The filter method is used to select elements as per the Predicate passed as an argument.
map() takes each value and performs operations on it. It returns a stream consisting of the results of applying the given function to the elements of this stream.
reduce() method does not return the stream but it gives the value of a type that you defined in the stream. It is used to reduce the elements of a stream to a single value.
The reduce method takes a BinaryOperator as a parameter.

#3
If you want to use Big Data, then first you have to apply a filter on it to separate useful data.
After applying a filter, you need to transform it into the required data with the help of a map.
And the graph of it, can be made with the help of the reduce method.
We can reduce the code by applying methods one after the other.

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