Inheritance

abstract class Animal {

public void die() {...};

abstract void talk();

}

class Dog extends Animal {

public void talk() {

System.out.println("bark");

}

}

class Cat extends Animal {

public void talk() {

System.out.println("meow");

}

}

Animal d=new Dog();

Animal c=new Cat();

c.talk();

d.talk(); // polymorphism

c.die(); // code reuse

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