Java 8 IntConsumer Interface

In this blog post, I will be explaining how the Java 8 functional interface IntConsumer works. To know more about functional interfaces, you can refer this blog post.

The IntConsumer interface provides a method called accept. It accepts a single parameter of int data type. It does not return anything, it returns a void. So it operates via side effects i.e. it modifies the parameter passed in. The  IntConsumer interface is a specialization of the Consumer interface. While the Consumer interface accepts any data type, the  IntConsumer interface accepts an Integer value. To see an example of the Consumer interface, refer to this blog post.

IntConsumer Example

Consider the following code snippet:

public class IntConsumerDemo {

  public static void main(String args[]) {
    IntConsumer incrementby5 = (num) -> System.out.println("Input:"+num+", Incremented Value:"+(num+5));
    incrementby5.accept(12);
    incrementby5.accept(23);
  }

}

Here, the IntConsumer.accept method accepts an integer value. It increments the input by 5  and prints the result.  So when the above code is executed, it will print the following output:

Input:12, Incremented Value:17
Input:23, Incremented Value:28

You can get the source code for this example along with other code for other Java 8 examples at the Github repository here.