/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Optional<Animal> anAnimalThatMeows = 
            EnumSet
                .allOf(Animal.class)
                .stream()
                .filter(( Animal animal ) -> animal.getSound().equals("meow"))
                .findAny() ;
        System.out.println( anAnimalThatMeows );
	}
}
 
enum Animal {
    DOG("bark"),
    CAT("meow");
 
    public final String sound;
 
    Animal(String sound) {
        this.sound = sound;
    }
 
    public String getSound() {
        return sound;
    }
}
 

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