Same example expressed functionally.
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package pl.amu.edu.demo.primes;
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import lombok.NoArgsConstructor;
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import java.util.function.IntPredicate;
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import java.util.stream.IntStream;
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@NoArgsConstructor
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public class FunctionalPrimes {
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public static void main(String[] args) {
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new FunctionalPrimes().printPrimes();
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}
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public void printPrimes() {
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IntStream.range(0, 121)
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.filter(this::isPrime)
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.forEach(i -> System.out.printf("%d is prime\n", i));
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}
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private boolean isPrime(int number) {
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if (number <= 0) {
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return false;
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}
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IntPredicate isDivisible = (int divisor) -> number % divisor == 0;
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return IntStream.rangeClosed(2, (int) Math.sqrt(number))
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.noneMatch(isDivisible);
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}
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}
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