Working with different collectors

We can follow a functional approach and solve different kinds of algorithms with stream processing pipelines and the help of the diverse collectors provided by Java 9, that is, the diverse static methods provided by the java.util.stream.Collectors class. In the next examples, we will use different arguments for the collect method.

The following lines join all the names for the MobileGame instances to generate a single String with the names separated with a separator ("; "). The code file for the sample is included in the java_9_oop_chapter_12_01 folder, in the example12_21.java file.

repository.getAll().stream()
.map(game -> game.name.toUpperCase())
.collect(Collectors.joining("; "));

The code passes Collectors.joining(";" ) as an argument to the collect method. The joining static method returns a Collector that concatenates the input elements into a String separated by the delimiter received as an argument. The following shows...