LongFunction Interface is a part of the java.util.function package which is introduced in Java 8. It is an in-built Functional Interface. This function expects an long-valued argument as an input and produces a result. As it is a functional interface, it can be used assignment target for lambda expression or method reference. In this post, we are going to see several implementations of LongFunction Interface by using different examples.

LongFunction_Interface_Java8_Techndeck

LongFunction Interface in Java 8 with Examples...!!! Click To Tweet

Look at LongFunction Javadoc description below:

LongFunction_Signature_Java8_Techndeck

LongFunction Interface contains below method:

apply

Let’s discuss this method:

apply 

This method performs operation on the given long-valued argument and return a result.

Lets understand above mentioned method through below example:

Example. ‘apply’ method

Output:
Java 8 LongFunction Interface is an absolute useful addition as part of ‘Functional Interfaces’ and can serve variety of purposes. It is quite powerful as it can be used as a higher order functions through lambda functions and above examples could help you to get better idea on how to implement it.

LongFunction Interface in Java 8 with Examples...!!! Click To Tweet

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