Java 8 : Consumer

What is a Consumer?

Consumer is a predefined functional interface like Predicate, present in java.util.function package. It has one abstract method called accept();

 Consumer can be used to consume object and perform a certain operation it takes one argument but won't return anything.

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interface Consumer<T,R> { public void accept(T t); }

Consumer example 1: Take a single argument and print the value.

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package com.blogspot.ekumeedkiasha; import java.util.function.Consumer; public class ConsumerExample1 { public static void main(String[] args) { Consumer<String> con = s -> System.out.println(s); con.accept("ekumeedhelp"); } }

Consumer Chaining example:

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package com.blogspot.ekumeedkiasha; import java.util.function.Consumer; public class ConsumerExample1 { public static void main(String[] args) { Consumer<String> con = s -> System.out.println(s.toUpperCase()); Consumer<String> con1 = s -> System.out.println("(" + s + ")"); con.andThen(con1).accept("ekumeed"); } }

 

Author : Ekumeed Help

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