Predicate, Function, Consumer, Supplier in Java | Functional Interfaces in JAVA | Dilip Singh

As part of making sessions about features introduced from the JAVA 8 Version, I have created this session for Understanding Pre Defined Functional Interfaces, their functionalities, and usage in Java language for beginners to understand more specifically. To achieve more understanding of Functional programming and Stream API Programming and methods, we should be aware of these defined functional interfaces.

The interfaces in java.util.function package are general-purpose functional interfaces used by the JDK, and are available to be used by user code as well.

Functional interfaces often represent abstract concepts like functions, actions, or predicates. The functional interfaces in this package follow an extensible naming convention, as follows:

There are several basic function shapes, including
Function (unary function from T to R),
Predicate (unary function from T to boolean),
Consumer (unary function from T to void), and
Supplier (nilary function to R).

There are 4 main functional interfaces are introduced which could be used in different scenarios. These are given below.

👉 Function
👉 Predicate
👉 Consumer
👉 Supplier

I have explained the internal details of the below points in this session.

Use Cases Of Functional Interfaces and Implementations

I will make sessions, covering every other feature introduced from Java 8 onwards, with more use cases and implicit details concerning the usage in application development and interview perspective also.


Other Java 8 sessions with Examples:

   • default Methods in Interfaces | stati...  
   • Functional Interfaces in Java | Lambd...  
   • Method References  in JAVA | Construc...  
   • JAVA 8  Features Tutorials  

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