Intermediate and terminal operation in Stream Java 8 Interview Questions | Difference | Code Decode

In this video of code decode we have explained what is intermediated what is terminal operation and difference between them. We have also explained it with the help of examples

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What is an Intermediate operation

The operations which return another stream as a result are called intermediate operations. V imp part, they are lazy.
Eg:

filter(), map(), distinct(), sorted(), limit(), skip()

What is Terminal operation
The operations which return non-stream values like primitive or object or collection or return nothing are called terminal operations

You can chain multiple intermediate operations and none of them will do anything until you invoke a terminal operation. At that time, all of the intermediate operations that you invoked earlier will be invoked along with the terminal operation.

Eg:

forEach(), toArray(), reduce(), collect(), min(), max(), count(), anyMatch(), allMatch(), noneMatch(), findFirst(), findAny()

Intermediate Operations

They return stream.
They can be chained together to form a pipeline of operations.
Pipeline of operations may contain any number of intermediate operations.
Intermediate operations are lazily loaded.
They don’t produce end result.
Terminal Operations

They return non-stream values.
They can’t be chained together.
Pipeline of operations can have maximum one terminal operation, that too at the end.
Terminal operations are eagerly loaded.
They produce end result.
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