vararg

package ch.fhnw.claudemartin;

import java.util.Arrays;
import java.util.List;
import java.util.Optional;

public class SomeClass {
  static void m(final Optional<?>... args) {
    System.out.println("m(" + Arrays.toString(args) + ")");
  }

  public static void main(final String[] args) {
    // Integer:
    m(Optional.of(1));
    // String:
    m(Optional.of("a"), Optional.of("b"));
    @SuppressWarnings("unchecked")
    // Long as array:
    final Optional<Long>[] longs = new Optional[] { Optional.of(42L), Optional.of(0L) };
    m(longs);
    // Number as List:
    final List<Optional<Number>> numbers = Arrays.asList(Optional.of(42L), Optional.of(0d));
    m(numbers.toArray(new Optional[numbers.size()]));
  }
}