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Jb0130r Review

Module by: R.G. (Dick) Baldwin. E-mail the author

Summary: This module contains review questions and answers keyed to the module titled Jb0130: Java OOP: A Gentle Introduction to Methods in Java

Preface

This module contains review questions and answers keyed to the module titled Jb0130: Java OOP: A Gentle Introduction to Methods in Java .

The questions and the answers are connected by hyperlinks to make it easy for you to navigate from the question to the answer and back again.

Questions

Question 1 .

True or false? Methods are often called functions, procedures, subroutines, and various other names.

Answer 1

Question 2

True or false? A Java method can be thought of as a separate program module that has the ability to do something useful. Having written the method, you can make it available for use as a helper to your main program each time your main program needs to have that useful thing done.

Answer 2

Question 3

True or false? In Java, you must write all of the methods that you need.

Answer 3

Question 4

True or false? In the following statement, sqRtPeas is the name of a method.

System.out.println(sqRtPeas);

Answer 4

Question 5

True or false? Java only allows you to use the pre-written methods in the class libraries.

Answer 5

Question 6

Normally, when designing and writing a method such as one that can calculate the square root of a number, it is desirable to write it in such a way that it can calculate the square root of any number (as opposed to only one specific number) . How is that accomplished?

Answer 6

Question 7

True or false? According to common programming jargon, the process of causing a method to be executed is commonly referred to as setting the method.

Answer 7

Question 8

True or false? This process of providing information to a method when you call it is commonly referred to as sending a message to the method.

Answer 8

Question 9

True or false? When called, a method will usually

  • perform an action
  • send back an answer. or
  • some combination of the two

Answer 9

Question 10

True or false? A value of type double can be (almost) any numeric value, positive or negative, with or without a decimal part.

Answer 10

Question 11

True or false? Java is not a case-sensitive programming language.

Answer 11

Question 12

True or false? The following two rules will generally suffice to keep you out of trouble when defining variable and method names in Java:

  • Use only letters and numbers in Java names.
  • Always make the first character a letter.

Answer 12

Question 13

True or false? In Java, the assignment operator is the % character.

Answer 13

Question 14

True or false? The behavior of the sqrt method is to calculate and display the square root of the value passed to it as a parameter.

Answer 14

Question 15

True or false? The syntax for passing parameters to a method consists of following the name of the method with a pair of matching parentheses that contain the parameter or parameters. If more than one parameter is being passed, they are all included within the parentheses and separated by commas. The order of the parameters is not important.

Answer 15

What is the meaning of the following two images?

This image was inserted here simply to insert some space between the questions and the answers to keep them from being visible on the screen at the same time.

The image is also an example of the kinds of things that we do in my course titled ITSE 2321, Object-Oriented Programming.

Missing image

This image was also inserted for the purpose of inserting space between the questions and the answers.

Missing image

Answers

Answer 15

False. Normally the order in which parameters are passed to a method is very important.

Back to Question 15

Answer 14

False. The behavior of the sqrt method is to calculate and return the square root of the value passed to it as a parameter.

Back to Question 14

Answer 13

False. In Java, the assignment operator is the = character.

Back to Question 13

Answer 12

Answer 11

False. Just like C, C++, and C#, Java is very much a case-sensitive programming language.

Back to Question 11

Answer 10

Answer 9

Answer 8

False. If you continue in this field of study, you will learn that we send messages to objects by calling methods that belong to the objects. The process of providing information to a method when you call it is commonly referred to as passing parameters to the method.

Back to Question 8

Answer 7

False. The process of causing a method to be executed is commonly referred to as calling or possibly invoking the method.

Back to Question 7

Answer 6

That is accomplished through the use of something called method parameters .

Back to Question 6

Answer 5

False. In addition to the standard methods that are already available, if you need a method to perform some function and there is no standard method already available to perform that function, you can write your own method.

Back to Question 5

Answer 4

False. In the following statement, println is the name of a method. sqRtPeas is the name of a variable whose contents are being passed as a parameter to the println method.

System.out.println(sqRtPeas);

Back to Question 4

Answer 3

False. The Java programming environment contains a large number of methods (in the class libraries) that are already available for you to use when you need them.

Back to Question 3

Answer 2

Answer 1

Miscellaneous

This section contains a variety of miscellaneous information.

Note:

Housekeeping material
  • Module name: Jb0130r Review: A Gentle Introduction to Methods in Java
  • File: Jb0130r.htm
  • Published: 12/20/12
  • Revised: 01/02/13

Note:

Disclaimers:

Financial : Although the Connexions site makes it possible for you to download a PDF file for this module at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, you should be aware that some of the HTML elements in this module may not translate well into PDF.

I also want you to know that, I receive no financial compensation from the Connexions website even if you purchase the PDF version of the module.

In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale on Amazon.com showing me as the author. I neither receive compensation for those sales nor do I know who does receive compensation. If you purchase such a book, please be aware that it is a copy of a module that is freely available on cnx.org and that it was made and published without my prior knowledge.

Affiliation : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.

-end-

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