Java Inheritance Practice

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 is 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();

Cat class extends Predator class.

Which of the following must be true?

• A Cat object has access to all 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.

What does polymorphism mean?

• Changing shapes
• Having many forms
• Being unchangeable
• Easy

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

• True
• False

When the subclass method is intended as a replacement of the superclass method.

• Overriding
• Dependency
• Extension
• Aggregation

When an object's class is a subclass of a more general class.

• Extension

• Aggregation

• Inheritance

• Dependency

Which Java statement represents inheritance?

• class body inherit Car

• class body super Car

• class body extends Car

• class body this Car

• class body override Car