Java 8 LongConsumer Interface

11 months ago codedestine 0

In this tutorial, we will learn about Java 8 LongConsumer interface.

Java 8 LongConsumer Interface

LongConsumer Interface :-

LongConsumer ( java.util.function.LongConsumer ) is a functional interface that has one abstract method and one default method declared in it. This interface is a specialised form of Consumer interface.

Abstract method :-  

void  accept ( long value ) :- The abstract method accept ( long value ) is a functional method. It accepts one long value as an argument and return no value, it performs the operation defined by the LongConsumer interface ( usually a lambda expression passed as an argument ). 

Default method :-  

default  LongConsumer  andThen ( LongConsumer after ) :- It returns a LongConsumer that performs two operation in sequence, first the operation of the LongConsumer on which method is called followed by the operation of the LongConsumer passed as an argument.

Reference :-  LongConsumer Interface JavaDocs 

Example :- 

This example will show you, how to create and call different methods of a LongConsumer interface.

  public static void main(String[] args){ 
 
    LongConsumer consumer1 = ( x ) -> { System.out.println(x + " 1st"); }; 
    // Example of accept 
    consumer1.accept(2l);
 
    LongConsumer consumer2 = ( x ) -> { System.out.println(x + " 2nd"); }; 
    // Example of andThen
    consumer1.andThen(consumer2).accept(3l);

  }  

Result :- 

2 1st
3 1st
3 2nd

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