300-quiz01-java

If more than one class implements an interface, its methods are ____.

• aggregated

• public

• dependent

• polymorphic

Inheritance is used when the relationship between two classes is a(n) _______ relationship.

• "HAS-A"

• "PART-OF-A"

• "IS-A"

• inverse

The following Syntax is used for?

class Subclass-name extends Superclass-name

{

//methods and fields

}

• Polymorphism

• Encapsulation

• Inheritance

• None of the above

A class that is inherited can be called a ______ .

• superclass

• subclass

• subsetclass

• relativeclass

Class Cat extends Animal. Which is NOT a valid declaration?

• Cat x = new Cat();

• Animal X = new Animal();

• Cat x = new Animal();

• Animal x = new Cat();

Class dog implements the animal interface.

Which IS a valid declaration?

• Dog d = new Animal();

• Animal d = new Dog();

• Animal d = new Animal();

• Dog d = new Dog();

Cat class extends Predator class.

Which of the following must be true?

• A Cat object has access to all non private Predator variables and methods.

• A Predator object has access to all Cat variables and methods.

• Cat c = new Predator();

  causes an error.

• Predator p = new Cat();

  p has access to Cat methods and uses the Predator implementations.

Which of these cannot be passed down through inheritance?

• Public variables

• Private variables

• Methods

• Data

In Java, each child class can have only one parent.

• True

• False

When overloading a method, the method header ________ .

• Must exactly match the header of the method you are overloading.

• Must have the same name, but differ in order, number, or type of parameters.

• Can differ in name, but must have the same number and order of parameters.

• Can be completely different from the method you are overloading, but must have @Override.