CS 122 - Final Examination

A way to discover which of the two classes is the base class and which is the subclass is to _______.

• look at the class size

• try saying the two class names together

• use polymorphism

• Both a and b are correct

Employing inheritance reduces errors because ______.

• the new classes have access to fewer data fields

• the new classes have access to fewer methods

• you can copy methods that you already created

• many of the methods you need have already been used and tested

A base class can also be called a ______.

• child class

• subclass

• derived class

• superclass

Which of the following choices is the best example of a parent class/child class relationship?

• Rose/Flower

• Present/Gift

• Dog/Poodle

• Sparrow/Bird

The Java keyword that creates inheritance is _____.

• static

• enlarge

• extends

• inherits

A class named Building has a public, nonstatic method named getFloors(). If School is a child class of Building, and modelHigh is an object of type School, which of the following statements is valid?

• Building.getFloors();

• School.getFloors();

• modelHigh.getFloors();

• All of the previous statements are valid.

Which of the following statements is true?

• A child class inherits from a parent class.

• A parent class inherits from a child class.

• Both of the preceding statements are true.

• Neither a nor b is true.

In Java, the concept of keeping data private is known as _____.

• polymorphism

• information hiding

• data deception

• concealing fields

A JFrame is a descendant of each of the following classes except the _____class.

• Component

• Jar

• Container

• Window

The statement JFrame myFrame = new JFrame(); creates a JFrame that is ________.

• invisible and has no title

• invisible and has a title

• visible and has no title

• visible and has a title