Enthuware

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class Fruit{ }
class Apple extends Fruit{ }
class Mango extends Fruit{ }
interface Poisonous{ }

class TestClass{

    public static void main(String[] args){
        Fruit f = new Mango(); //ok, because Mango is-a Fruit
        Poisonous p = (Poisonous) f; //compiles fine but throws a ClassCastException at run time
    }
}

class StarFruit extends Fruit implements Poisonous{
        public static void main(String[] args){
            Fruit f = new StarFruit();
            Poisonous p = (Poisonous) f; //compiles and runs fine
        }
}