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The purpose of this module is to present the first complete Java program of the collection that previews the most common forms of the three pillars of procedural programming: sequence, selection, and loop. The program also previews calling a method, passing a parameter to the method, and receiving a returned value from the method.

Revised: Sun Mar 27 18:57:37 CDT 2016

Table of contents


The purpose of this module is to present the first complete Java program of the collection that previews the most commonforms of the three pillars of procedural programming:

  • sequence
  • selection
  • loop

The program also illustrates

  • calling a method,
  • passing a parameter to the method, and
  • receiving a returned value from the method.

As mentioned above, this is simply a preview. Detailed discussions of these topics will be presented in future modules.

Viewing tip

I recommend that you open another copy of this module in a separate browser window and use the following links to easily find and view the Figuresand Listings while you are reading about them.




Instructions for compiling and running the program

Assuming that the Java Development Kit (JDK) is properly installed on your computer (see Jb0110: Java OOP: Programming Fundamentals, Getting Started ), do the following to compile and run this program.

1. Copy the text from Listing 1 into a text file named FirstProgram.java and store the file in a folder on your disk.

2. Open a command-line window in the folder containing the file.

3. Type the following command at the prompt to compile the program:

javac FirstProgram.java

4. Type the following command at the prompt to run the program:

java FirstProgram


Any text in the program code that begins with // is a comment. The compiler will ignore everything from the // to the end of the line.

Comments were inserted into the program code to explain the code.

The compiler also ignores blank lines.

Note that this program was designed to illustrate the concepts while being as non-cryptic as possible.

Program output

The program should display the text shown in Figure 1 on the screen except that the time will be different each timeyou run the program.

Figure 1 . Program output.
value in = 5 Odd time = 1353849164875countA = 0 countA = 1countA = 2 countB = 0countB = 1 countB = 2value out = 10

Run the program

I encourage you to copy the code from Listing 1 . Compile the code and execute it. Experiment with the code,making changes, and observing the results of your changes. Make certain that you can explain why your changes behave as they do.


This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Jb0115: Java OOP: First Program
  • File: Jb0115.htm
  • Published: 11/25/12

Questions & Answers

what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
yes that's correct
I think
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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