Java 8 Interview Questions And Answers | Consumer || BiConsumer || Supplier || Chaining (Live Demo)

Опубликовано: 09 Февраль 2021
на канале: Code Decode

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Consumer : It will consume Item. Consumers never return anything (never supply), they just consume.

Consumer Chaining :
We can combine / chain multiple consumers together with andThen .

There is only one ways to combine consumers:
c1.andThen(c2).apply(Input); - first c1 then c2

No compose() in consumer.

Multiple consumers can be chained together like :
c1.andThen(c2).andThen(c3).andThen(c4).apply(Inputs);

Supplier :
It will just supply required objects and will not take any input
Its always going to supply never consume / take any input.

EG : always supply me current date.
No chaining as no input is given to this. Only it gives u output.

Advantages:
Write once, use anywhere.

Code Reusability

BiCinsumer Bisupplier :
What if we need 2 arguments for operation?

Then we need Bi XYZ Functional Interfaces.

There is no input in supplier so no 1 or 2 Input arguments needed. Hence no BiSupplier.

Q) If we want to operate on 3 arguments then triPredicate?

There are no TriPredicate or TriFunction etc.

No QuadPredicate No QuadFunction.

Java 8 has inbuilt Functional interfaces that can take only 1 or 2 arguments no more.

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