interface Talker
{
    String talks();
}
 
class Pet<T extends Talker>
{
    private T pet;
 
    public Pet(T pet)
    {
        this.pet = pet;
    }
 
    public String talks()
    {
        return pet.talks();
    }
}
 
class Cat implements Talker
{
    public String talks()
    {
        return "Meow";
    }
}
 
class Dog implements Talker
{
    public String talks()
    {
        return "Woof";
    }
}
 
public class Main
{
    public static void main(String[] args)
    {
        Pet<Cat> cat = new Pet<Cat>(new Cat());
        System.out.println("Cat says " + cat.talks());
 
        Pet<Dog> dog = new Pet<Dog>(new Dog());
        System.out.printf("Dog says " + dog.talks());
    }
 
}

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