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Listing 9 . Answer 47.
mars.getPicture().addMessage( "Dick Baldwin",10,20);

Back to Question 47

Answer 46

True.

Back to Question 46

Answer 45

True.

Back to Question 45

Answer 44

True.

Back to Question 44

Answer 43

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.

Back to Question 43

Answer 42

True.

Back to Question 42

Answer 41

False. Everything in Java is passed and returned by value , not by reference.

Back to Question 41

Answer 40

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.

Back to Question 40

Answer 39

True.

Back to Question 39

Answer 38

False.

The default values are:

  • 0 or 0.0 for numeric variables
  • false for boolean variables
  • null for reference variables

Back to Question 38

Answer 37

True.

Back to Question 37

Answer 36

False. When an object is instantiated, the constructor returns a reference to the new object.

Back to Question 36

Answer 35

True.

Back to Question 35

Answer 34

True.

Back to Question 34

Answer 33

True.

Back to Question 33

Answer 32

False. The code in Listing 5 instantiates one object of the World class and populates that world with two objects of the Turtle class.

Back to Question 32

Answer 31

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.

Back to Question 31

Answer 30

True.

Back to Question 30

Answer 29

True.

Back to Question 29

Answer 28

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) .

Back to Question 28

Answer 27

True.

Back to Question 27

Answer 26

True.

Back to Question 26

Answer 25

True.

Back to Question 25

Answer 24

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.

Back to Question 24

Answer 23

True.

Back to Question 23

Answer 22

True.

Back to Question 22

Answer 21

True.

Back to Question 21

Answer 20

False.

In general, the type of the variable must be:

  • The name of the class, or
  • The name of a superclass of the class, or
  • The name of an interface implemented by the class.

Back to Question 20

Answer 19

True.

Back to Question 19

Answer 18

False. The period ahead of the semicolon in Listing 4 says to search the current folder first.

Back to Question 18

Answer 17

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.

Back to Question 17

Answer 16

True.

Back to Question 16

Answer 15

True

Back to Question 15

Answer 14

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.

Back to Question 14

Answer 13

False. The Java compiler program is named javac.exe . The virtual machine is named java.exe .

Back to Question 13

Answer 12

True.

Back to Question 12

Answer 11

True.

Back to Question 11

Answer 10

True.

Back to Question 10

Answer 9

True.

Back to Question 9

Answer 8

False. The required command is shown in Listing 3 .

Listing 3 . Answer 8.
javac Prob01.java

Back to Question 8

Answer 7

True.

Back to Question 7

Answer 6

False. The name of the application shown in Listing 1 is Prob01 .

Back to Question 6

Answer 5

True.

Back to Question 5

Answer 4

False. Java applets do not require a method named main .

Back to Question 4

Answer 3

True.

Back to Question 3

Answer 2

False. java.awt.Color belongs to the Java standard edition class library.

Back to Question 2

Answer 1

True.

Back to Question 1

Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Java3002r Review: Creating and Manipulating Turtles and Pictures in a World Object
  • File: Java3002r.htm
  • Published: 02/10/13
Disclaimers:

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-

Questions & Answers

show that the set of all natural number form semi group under the composition of addition
Nikhil Reply
what is the meaning
Dominic
explain and give four Example hyperbolic function
Lukman Reply
_3_2_1
felecia
⅗ ⅔½
felecia
_½+⅔-¾
felecia
The denominator of a certain fraction is 9 more than the numerator. If 6 is added to both terms of the fraction, the value of the fraction becomes 2/3. Find the original fraction. 2. The sum of the least and greatest of 3 consecutive integers is 60. What are the valu
SABAL Reply
1. x + 6 2 -------------- = _ x + 9 + 6 3 x + 6 3 ----------- x -- (cross multiply) x + 15 2 3(x + 6) = 2(x + 15) 3x + 18 = 2x + 30 (-2x from both) x + 18 = 30 (-18 from both) x = 12 Test: 12 + 6 18 2 -------------- = --- = --- 12 + 9 + 6 27 3
Pawel
2. (x) + (x + 2) = 60 2x + 2 = 60 2x = 58 x = 29 29, 30, & 31
Pawel
ok
Ifeanyi
on number 2 question How did you got 2x +2
Ifeanyi
combine like terms. x + x + 2 is same as 2x + 2
Pawel
x*x=2
felecia
2+2x=
felecia
×/×+9+6/1
Debbie
Q2 x+(x+2)+(x+4)=60 3x+6=60 3x+6-6=60-6 3x=54 3x/3=54/3 x=18 :. The numbers are 18,20 and 22
Naagmenkoma
Mark and Don are planning to sell each of their marble collections at a garage sale. If Don has 1 more than 3 times the number of marbles Mark has, how many does each boy have to sell if the total number of marbles is 113?
mariel Reply
Mark = x,. Don = 3x + 1 x + 3x + 1 = 113 4x = 112, x = 28 Mark = 28, Don = 85, 28 + 85 = 113
Pawel
how do I set up the problem?
Harshika Reply
what is a solution set?
Harshika
find the subring of gaussian integers?
Rofiqul
hello, I am happy to help!
Shirley Reply
please can go further on polynomials quadratic
Abdullahi
hi mam
Mark
I need quadratic equation link to Alpa Beta
Abdullahi Reply
find the value of 2x=32
Felix Reply
divide by 2 on each side of the equal sign to solve for x
corri
X=16
Michael
Want to review on complex number 1.What are complex number 2.How to solve complex number problems.
Beyan
yes i wantt to review
Mark
16
Makan
x=16
Makan
use the y -intercept and slope to sketch the graph of the equation y=6x
Only Reply
how do we prove the quadratic formular
Seidu Reply
please help me prove quadratic formula
Darius
hello, if you have a question about Algebra 2. I may be able to help. I am an Algebra 2 Teacher
Shirley Reply
thank you help me with how to prove the quadratic equation
Seidu
may God blessed u for that. Please I want u to help me in sets.
Opoku
what is math number
Tric Reply
4
Trista
x-2y+3z=-3 2x-y+z=7 -x+3y-z=6
Sidiki Reply
can you teacch how to solve that🙏
Mark
Solve for the first variable in one of the equations, then substitute the result into the other equation. Point For: (6111,4111,−411)(6111,4111,-411) Equation Form: x=6111,y=4111,z=−411x=6111,y=4111,z=-411
Brenna
(61/11,41/11,−4/11)
Brenna
x=61/11 y=41/11 z=−4/11 x=61/11 y=41/11 z=-4/11
Brenna
Need help solving this problem (2/7)^-2
Simone Reply
x+2y-z=7
Sidiki
what is the coefficient of -4×
Mehri Reply
-1
Shedrak
A soccer field is a rectangle 130 meters wide and 110 meters long. The coach asks players to run from one corner to the other corner diagonally across. What is that distance, to the nearest tenths place.
Kimberly Reply
Jeannette has $5 and $10 bills in her wallet. The number of fives is three more than six times the number of tens. Let t represent the number of tens. Write an expression for the number of fives.
August Reply
What is the expressiin for seven less than four times the number of nickels
Leonardo Reply
How do i figure this problem out.
how do you translate this in Algebraic Expressions
linda Reply
why surface tension is zero at critical temperature
Shanjida
I think if critical temperature denote high temperature then a liquid stats boils that time the water stats to evaporate so some moles of h2o to up and due to high temp the bonding break they have low density so it can be a reason
s.
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Object-oriented programming (oop) with java. OpenStax CNX. Jun 29, 2016 Download for free at https://legacy.cnx.org/content/col11441/1.201
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