DoubleFunction Interface in Java 8 with examples

This entry is part 27 of 43 in the series Java 8 Functional Interfaces

DoubleFunction 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 one double-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 DoubleFunction Interface by using different examples.

DoubleFunction_Interface_Java8_Techndeck

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Look at DoubleFunction Javadoc description below:

DoubleFunctionInterface_Signature_Java8_Techndeck

 

 

 

 

 

DoubleFunction Interface contains following method:

apply 

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

 

Lets understand above mentioned method thorough below example:

Example: ‘apply’ method

Java 8 DoubleFunction 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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