Java 8 Cosumer Functional Inteface.

Java 8 offers a Functional interface called Consumer,A consumer allows you to take in a value and return no results.It is expected to have side effects.

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public class ConsumerExample {
  public static void main(String[] args)
  {
    Arrays.asList("a","b","c","d").stream().forEach(testConsumer);
  }
  static Consumer<String> testConsumer=(x)->{System.out.println(x);};
}

More information can be found here https://docs.oracle.com/javase/8/docs/api/java/util/function/Consumer.html