IntToDoubleFunction Interface in Java 8 with examples

This entry is part 23 of 43 in the series Java 8 Functional Interfaces

IntToDoubleFunction 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 accepts a int-valued argument and produces an double-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 IntToDoubleFunction Interface by using different examples.

IntToDoubleFunction_Interface_Java8_Techndeck

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Look at IntToDoubleFunction Javadoc description below:

IntToDoubleFunctionInterface_Signature_Java8_Techndeck

 

 

 

 

IntToDoubleFunction Interface contains following method:

applyAsDouble

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

 

Lets understand above mentioned method thorough below example:

Example: ‘applyAsDouble’ method

 

Output:

 

Java 8 IntToDoubleFunction 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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