LongConsumer 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 a single long-valued argument as input but produces no output. In this post, we are going to see several implementations of LongConsumer Interface by using different examples.


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Look at LongConsumer Javadoc description below:


LongConsumer Interface contains 2 methods:

  1. accept 

  2. andThen

Let’s discuss these methods:


This method performs operation on the given argument and return no result.

Below is an example to demonstrate accept() method:

Example 1. ‘accept’


This method returns a composed LongConsumer that performs, in sequence, this operation followed by the after operation. If performing either operation throws an exception, it is relayed to the caller of the composed operation. If performing this operation throws an exception, the after operation will not be performed.

Below is an example to demonstrate andThen() method:

Example 2. ‘andThen’

Java 8 LongConsumer 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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  • Deepak Verma

    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.