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Trying some function composition, but it is not working

master
Julio Biason 6 years ago
parent
commit
4262461c3c
  1. 2
      .gitignore
  2. 45
      Compo.java

2
.gitignore vendored

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*.class
*.sw?

45
Compo.java

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/*
* This is me testing function composition in Java.
*
*/
import java.util.List;
import java.util.stream.Stream;
import java.util.stream.Collectors;
import java.util.function.Function;
import java.util.function.Consumer;
public class Compo {
public static void main(String[] argv) {
System.out.println("Starting up...");
Doubler doubler = new Doubler();
PlusTwo plusTwo = new PlusTwo();
Printer printer = new Printer();
List<Long> result = Stream.of(2L, 4L, 5L, 7L)
.peek(doubler.andThen(plusTwo).andThen(printer))
.collect(Collectors.toList());
System.out.println("Result: " + result);
}
private static class Doubler implements Function<Long, Long> {
@Override
public Long apply(Long input) {
return input * 2;
}
}
private static class PlusTwo implements Function<Long, Long> {
@Override
public Long apply(Long input) {
return input + 2L;
}
}
private static class Printer implements Consumer<Long> {
@Override
public void accept(Long input) {
System.out.println("Consumer: " + input);
}
}
}
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