Java Streams | Part 2 | Intermediate operations | Terminal Operations | Java 8 Interview Questions смотреть онлайн

Part one : https://youtu.be/GlH7CMwYmw0

java.util.stream is a package introduced in jdk 1.8.
It has several interfaces & classes to work on streams
Classes under stream package introduced to support functional-style operations on the stream of elements.

Stream is not a collection rather it is a technique to make processing of collection’s data easy by supporting functional-style operations.
A stream is not a data structure that stores elements.

An operation on a stream produces a result, but does not modify its source.
The elements of a stream are only visited once during the life of a stream. Like an Iterator, a new stream must be generated to revisit the same elements of the source.

In order to gain the performance while processing the large amount of data, Stream has a concept of parallel processing without writing any multi threaded code.
Stream’s operations are primarily divided in to two categories : Intermediate operations & Terminal operations.

Stream works on a concept of ‘Pipeline of Operations’. A pipeline of operations consists of three things : a source, zero or more intermediate operations and a terminal operation.

The main difference between intermediate and terminal operations is that intermediate operations return a stream as a result and terminal operations return non-stream values like primitive or object or collection or may not return anything.

As intermediate operations return another stream as a result, they can be chained together to form a pipeline of operations. Terminal operations can not be chained together.

Pipeline of operations may contain any number of intermediate operations, but there has to be only one terminal operation, that too at the end of pipeline.

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Introduction to Java, It is a programming language and platform, it is a high-level language and also object-oriented,
It was developed by James Gosling from sun microsystems in 1995

Platform: Any software or hardware environment in which the program runs. It does not require anything from the operating system it is also an individual platform
High-level: any language whose wordings are near to natural language, which means easy to understand.
Object Oriented: object-oriented is something like a collection of rules and regulations that can be followed by any programming language like Python Java,C# we use oop concepts for the reusability of code. In oop, we can not access or fetch data unless making the object.

Why java?
Because it has been tested refined extended and proven by a dedicated community of java developers architects and enthusiasts
Because
Simple Grammer
Portability
Garbage collection
Speed
Huge library
Why java was created?
Java was created with five main goals
• It should be object-oriented
• A single representation of program code be executed on multiple operating systems (Write once run anywhere)
• It should fully support network programming
• It should be easy to use.

Java is divided in to three categories
J2SE (Java 2 Standard Edition ) //Desktop based applications
J2EE ( Java 2 Enterprise Edition) //Web-based applications
J2ME (Java 2 Micro or Mobile Edition) // Android applications

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