Java 8 DoubleConsumer Interface

11 months ago codedestine 0

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

Java 8 DoubleConsumer Interface

DoubleConsumer Interface :-

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

Default method :-  

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

Reference :-  DoubleConsumer Interface JavaDocs 

Example – 1 :- 

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

  public static void main(String[] args){ 
 
    DoubleConsumer consumer1 = ( x ) -> { System.out.println(x + " 1st"); }; 
    // Example of accept 
    consumer1.accept(2.00);
 
    DoubleConsumer consumer2 = ( x ) -> { System.out.println(x + " 2nd"); }; 
    // Example of andThen
    consumer1.andThen(consumer2).accept(3.00); 

 }  

Result :- 

2.0 1st
3.0 1st
3.0 2nd

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