FizzBuzz/Java: Difference between revisions

With Functional and OO elements

<syntaxhighlight lang="java">

import java.util.Arrays;

import java.util.function.IntPredicate;

import java.util.stream.IntStream;

public enum FizzBuzz {

Fizz(divisibleBy(3)),

Buzz(divisibleBy(5));

private final IntPredicate test;

FizzBuzz(IntPredicate test) {

this.test = test;

}

static IntPredicate divisibleBy(int i) {

return n -> n % i == 0;

}

String applyRule( int n) {

if (test.test(n))

return name();

return "";

}

private static String print(int i) {

String byRules = Arrays.stream(FizzBuzz.values())

.map(rule -> rule.applyRule(i))

.reduce("", String::concat);

return byRules.isEmpty() ? String.valueOf(i) : byRules;

}

public static void main(String[] args) {

IntStream.rangeClosed(1, 100)

.mapToObj(FizzBuzz::print)

.forEach(System.out::println);

}

}

</syntaxhighlight>