Learning RxJava - Second Edition

Making a Consumer a lambda

The Consumer<T> interface has a single abstract method, accept(), that takes a T argument and performs an action with it but does not return any value. Using an anonymous class, we can create a Consumer<String> that simply prints the string as shown in the following code snippet:

import java.util.function.Consumer;public class A_08 {    public static void main(String[] args) {        Consumer<String> printConsumer = new Consumer<String>() {            @Override            public void accept(String s) {                System.out.println(s);            }        };        printConsumer.accept("Hello World!");    }}

The output is as follows:

Hello World!

It can be implemented using a lambda expression as follows:

import java.util.function.Consumer;public class A_09 {    public static void main ...