Why this shows no output

Question

class Main {
public static void main(String[] args) {
Animal dog = new Dog();
Animal cat = new Cat();

dog.swim();
cat.swim();
dog.play();
cat.play();

}
}

interface Swimmer {
void swim();
}

interface Player {
void play();
}

//implement the Swimmer and the Player interfaces
abstract class Animal implements Swimmer , Player {

public abstract void swim();
public abstract void play();
}
class Dog extends Animal {
//Override the swim() and the play() methods
public void swim(){
System.out.println("1");
}
public void play(){
System.out.println("2");
}
}

class Cat extends Animal {
//Override the swim() and the play() methods
public void swim(){
System.out.println("3");
}
public void play(){
System.out.println("4");
}
}
}

Answer 1

Chandan Kumar

Because there is extra closing bracket in Cat class.

Answer 2

Thanks. Now it is working.