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  1. import java.util.List;
  2. import java.util.Optional;
  3.  
  4. class Ideone {
  5.   public static void main(String[] args) {
  6.     List<Pet> pets = List.of(new Dog(), new Cat());
  7.     pets.stream().parallel()
  8.         .forEach(Ideone::printSoundAndPet);
  9.   }
  10.  
  11.   private static void printSoundAndPet(Pet pet) {
  12.     final Optional<Pet> maybePet = Optional.ofNullable(pet);
  13.     maybePet.ifPresent(Pet::sound);
  14.     maybePet.map(Pet::toString)
  15.         .ifPresent(System.out::println);
  16.   }
  17. }
  18.  
  19. interface Pet {
  20.   void sound();
  21. }
  22.  
  23. class Dog implements Pet {
  24.   @Override
  25.   public void sound() {
  26.     System.out.println("Woof");
  27.   }
  28.  
  29.   @Override
  30.   public String toString() {
  31.     return "Dog";
  32.   }
  33. }
  34.  
  35. class Cat implements Pet {
  36.   @Override	
  37.   public void sound() {
  38.     System.out.println("Meow");
  39.   }
  40.  
  41.   @Override
  42.   public String toString() {
  43.     return "Cat";
  44.   }
  45. }
Success #stdin #stdout 0.1s 50488KB
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Standard input is empty
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Meow
Woof
Dog
Cat
https://ideone.com/StaLOA
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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