ToLongFunction 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 expect an argument as an input and produces a long-valued 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 ToLongFunction Interface by using different examples.

ToLongFunction_Interface_Java8_Techndeck

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Look at ToLongFunction Javadoc description below:

ToLongFunctionInterface_Signature_Java8_Techndeck

ToLongFunction Interface contains below method:

applyAsLong

Let’s discuss this method:

applyAsLong 

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

Let’s understand above mentioned method through below example:

Example. ‘applyAsLong’ method

Output:
Java 8 ToLongFunction 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.

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