| << Chapter < Page | Chapter >> Page > |
| Listing 9 . Answer 47. |
|---|
mars.getPicture().addMessage(
"Dick Baldwin",10,20); |
True.
True.
True.
False. Code in the println method calls a method named toString on each incoming object reference and displays the string value returned by that method.
True.
False. Everything in Java is passed and returned by value , not by reference.
False. If there is a need to make the contents of those variables available outside the object, that should be accomplished by defining public accessor methods.
True.
False.
The default values are:
True.
False. When an object is instantiated, the constructor returns a reference to the new object.
True.
True.
True.
False. The code in Listing 5 instantiates one object of the World class and populates that world with two objects of the Turtle class.
False. The three variables declared in Listing 5 are reference variables (as opposed to primitive variables) . This means that they are capable of storing references to objects as opposed to simplybeing able to store values of the eight primitive types. It also means that they are incapable of storing values of the eight primitive types.
True.
True.
False. Because these variables are declared private , they can only be accessed by code contained in methods defined inside the same class (and in inner classes of the class, which is beyond the scope of this module) .
True.
True.
True.
False. The method named println that is called in Listing 1 is a method belonging to a standard system object that represents the standardoutput device (usually the command-line screen) . The purpose of the println method is to display material on the command-line screen.
True.
True.
True.
False.
In general, the type of the variable must be:
True.
False. The period ahead of the semicolon in Listing 4 says to search the current folder first.
False. The purpose of the classpath is to tell the compiler and the virtual machine where to look for previously compiled class files that the applicationneeds in order to successfully compile and execute.
True.
True
False. The Prob01.java and Prob01 at the ends of the two commands in Listing 4 specify the files being operated on by the compiler and the virtual machine respectively.
False. The Java compiler program is named javac.exe . The virtual machine is named java.exe .
True.
True.
True.
True.
False. The required command is shown in Listing 3 .
| Listing 3 . Answer 8. |
|---|
javac Prob01.java |
True.
False. The name of the application shown in Listing 1 is Prob01 .
True.
False. Java applets do not require a method named main .
True.
False. java.awt.Color belongs to the Java standard edition class library.
True.
This section contains a variety of miscellaneous information.
Financial : Although the Connexions site makes it possible for you to download aPDF file for this module at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, youshould 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 ofthe module.
In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale onAmazon.com showing me as the author. I neither receive compensation for those sales nor do I know who does receive compensation. If youpurchase 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 andpublished 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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