Chapter 9 - Implementing Classes and using Objects

Which of the following best describes what happens?

A. sum becomes 1/2; f1 and f2 remain unchanged

What is displayed when the following code fragment is compiled/executed?

B. 2000

What happen if you forget to initialize a field that is an object and start calling its methods?

B. A run-time "null reference exception" error is reported

Which of the following is the appropriate name for a constructor in the class Flower?

B. Flower

Who invented Java?

B. James Gosling

The class Animal has a constructor that takes one int parameter. Which of the following is a valid statement that declares and creates an instance of an Animal in a program?

C. Animal elephant = new Animal (10);

Why doesn't Java let you create an object of the math class

C. B/C all Math;s methods and fields are static. so all math objects would be identical

Which of the following is NOT a good reason for making a class's field static?

C. The field is used to count the number of times any of the methods of a particular object are called

Which of the following statements would be illegal on someFun's body?

D. All of the above would be legal

What is called a client of a class x?

D. Any class that invokes X's constructors and/or calls its methods

What are overloaded methods?

D. Methods of the same class that have the same name but different numbers or types of parameters

A public method converToCm converts a person's height in feet and inches into centimeters and returns the result. Which of the following is the appropriate header for this method?

D. public int convertToCm(int feet, int inches)