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Java programs are composed of statements, and statements are constructed from expressions. This module takes a very brief look at Java statements and expressions.

Revised: Mon Mar 28 14:22:16 CDT 2016

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Java programs are composed of statements, and statements are constructed from expressions. This module takes a very brief look at Java statements andexpressions.


The first step

The first step in learning to use a new programming language is usually to learn the foundation concepts such as variables, types, expressions,flow-of-control, etc. This module concentrates on expressions and statements.


The hierarchy

Java programs are composed of statements, and statements are constructed from expressions.

An expression is a specific combination of operators and operands, that evaluates to a single value. The operands can be variables, constants, or methodcalls.

A method call evaluates to the value returned by the method.

Named constants

Java supports named constants that are implemented through the use of the final keyword.

The syntax for creating a named constant in Java is as follows:

Named constants final float PI = 3.14159;

While this is not a constant type, it does produce a value that can be referenced in the program and which cannot be modified.

The final keyword prevents the value of PI from being modified in this case . You will learn later that there are some other uses for the final keyword in Java as well.

Operator precedence

The order in which the operations are performed determines the result. You can control the order of evaluation by the use of matchingparentheses.

If you don't provide such parentheses, the order will be determined by the precedence of the operators (you should find and review a table of Java operator precedence) with the operations having higher precedence being evaluated first.


According to The Java Tutorials , "A statement forms a complete unit of execution."

A statement is constructed by combining one or more expressions into a compound expression and terminating that expression with a semicolon.

Further reading

As of November 2012, a good tutorial on this topic is available on the Oracle website titled Expressions, Statements, and Blocks .


This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Jb0220: Java OOP: Statements and Expressions
  • File: Jb0220.htm
  • Originally published: 1997
  • Published at cnx.org: 11/24/12

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 copied my modules from cnx.org, converted them to Kindle books, and placed them for sale on Amazon.com showing me as the author. Ineither receive compensation for those sales nor do I know who does receive compensation. If you purchase such a book, please beaware that it is a copy of a module that is freely available on cnx.org and that it was made and published withoutmy prior knowledge.

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


Questions & Answers

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
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Akash Reply
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Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
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I'm interested in nanotube
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Victor Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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