IntUnaryOperator 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 argument of type int as input but produces the output of same type as input argument. In this post, we are going to see several implementations of IntUnaryOperator Interface by using different examples.

IntUnaryOperator_Java8_Techndeck

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

Look at IntUnaryOperator Javadoc description below:

IntUnaryOperator_Java8_Signature_Techndeck

IntUnaryOperator Interface contains 4 methods:

  1. applyAsInt

  2. compose

  3. andThen

  4. identity

Let’s discuss these methods:

identity

This method returns a int unary operator that always returns its input argument.

applyAsInt 

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

Compose

This method returns a composed operator that first applies the before operator to its input, and then applies this operator to the result. If evaluation of either operator throws an exception, it is relayed to the caller of the composed operator.

andThen

This method returns a composed operator that first applies this operator to its input, and then applies the after operator to the result. If evaluation of either operator throws an exception, it is relayed to the caller of the composed operator.

Below are the several examples to demonstrate above methods:

Example 1. ‘applyAsInt’

Output:

Example 2. ‘andThen’

Output:

Example 3. ‘compose’

Output:

Java 8 IntUnaryOperator 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.

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

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Author

  • Deepak Verma is a Test Automation Consultant and Software development Engineer for more than 10 years. His mission is to help you become an In-demand full stack automation tester. He is also the founder of Techndeck, a blog and online coaching platform dedicated to helping you succeed with all the automation basics to advanced testing automation tricks.

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