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Listing 1 . A text version of Hello World.
class TextHelloWorld{ public static void main(String[]args){ System.out.println("Text Hello World");}//end main }//end class

As mentioned above, this program does not require the use of Ericson's library. It can be compiled and executed using a batch file containing thecommands shown in Figure 5 . You should make certain that you can compile and execute this program before progressing to the graphicversion.

Note that this batch file must be placed in the same folder that contains the file named TextHelloWorld.java , and that folder must be your "current directory."

Also note that the term "-cp . " (note the space followed by a period) is probablysuperfluous on most computers. According to PATH and CLASSPATH , "The default value of the classpath is "." (note the period), meaning that ..."

Therefore, it should not be necessary to specify the classpath as "-cp . " to compile and execute the program on mostcomputers. However, on 09/10/14, I encountered a student's computer that did notcomply with the default described above and this prevented the student from being able to compile and execute the program. Including "-cp . " in the javac and java commands doesn't cause any harm. Therefore, I have updated the batch file commands shown in Figure 5 to include it. You can omit it if your computer doesn't need it.

Figure 5 . Batch file for text version of Hello World.
echo off del *.classjavac -cp . TextHelloWorld.java java -cp . TextHelloWorldpause

A graphic version of Hello World

Listing 2 contains the code for a graphic version of Hello World.

Listing 2 . A graphic version of Hello World.
import java.awt.Color; class GraphicHelloWorld{public static void main(String[] args){Picture pix = new Picture(200,100); pix.setAllPixelsToAColor(Color.RED);pix.addMessage("Graphic Hello World",15,50); pix.show();}// end main }//end class

The program shown in Listing 2 causes the image shown in Figure 6 to be displayed when the program is compiled andexecuted.

Figure 6 - Hello World in graphics.

A graphic image with the text Hello World

As mentioned above, this program does require the use of Ericson's library. It can be compiled and executed using a batch file containing thecommands shown in Figure 7 . You should make certain that you can compile and execute this program before progressing to morecomplex programs involving Ericson's library.

Note that this batch file must be placed in the same folder that contains the file named GraphicHelloWorld.java , and that folder must be your "current directory."

Figure 7 . Batch file for graphic version of Hello World. .
echo off del *.classjavac -cp .;M:\bookClasses GraphicHelloWorld.java java -cp .;M:\bookClasses GraphicHelloWorldpause

Once again, the commands shown in Figure 7 assume that the bookClasses folder is in the root directory on the M-drive. The bookClasses folder will likely be in a different location on your computer.

Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Java OOP: The Guzdial-Ericson Multimedia Class Library
  • File: Java3000.htm
  • Published: 07/27/12
Disclaimers:

Financial : Although the Connexions site makes it possible for you to download a PDF file for thismodule at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, you should beaware 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 misappropriated copies of my modules from cnx.org, converted them to Kindle books, andplaced them for sale on Amazon.com showing me as the author. I receive no compensation for those sales and don't know who doesreceive compensation. If you purchase such a book, please be aware that it is a bootleg copy of a module that is freelyavailable on cnx.org.

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
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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
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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
Nêu ứng dụng, tác hại của lực điện động
NTQ Reply
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
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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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