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Java Quiz 9: Demonstrating Multilevel Inheritance

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Java Quiz 9: Demonstrating Multilevel Inheritance

Check out the answer to a quiz about upcasting and downcasting objects in Java and try out your knowledge when it comes to multilevel inheritance.

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Before we start with this week's quiz, here is the answer to Java Quiz 8: Upcasting and Downcasting Objects.

By upcasting objects, the overridden variable depends on the type of the object reference vc, but the overridden methods depend on the type of the object that was created. By downcasting objects, both variables and methods depend on the type of the object reference car.

The correct answer is: e.

Here is the quiz for today!

What happens when the following program is compiled and run?

Note: The classes Animal, WildAnimal, and BigCat are three separate files in one package.

Animal.java:

public class Animal {
    Animal() {
        System.out.print("Tiger" + " ");
    }
}


WildAnimal.java:

class WildAnimal extends Animal {
    WildAnimal(String s) {
        System.out.print(s + " ");
    }
}


BigCat.java:

public class BigCat extends WildAnimal {
    BigCat() {
        this("Jaguar");
    }
    BigCat(String s) {
        super(s);
        System.out.print(s + " ");
    }
    public static void main(String[] args) {
        new WildAnimal("Leopard");
        new BigCat();
    }
}


  • A. This program writes "Tiger Leopard Jaguar Jaguar" to the standard output.

  • B. This program writes "Tiger Leopard Tiger Jaguar Jaguar" to the standard output.

  • C. This program writes "Tiger Leopard Jaguar" to the standard output.

  • D. This program writes "Tiger Leopard Tiger Jaguar" to the standard output.

  • E. This program writes "Tiger Leopard" to the standard output.

  • F. This program does not compile.

The correct answer and its explanation will be included in the next quiz in two weeks! For more Java quizzes, puzzles, and assignments, take a look at my site!

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java ,quiz

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