Latest Tutorials| Questions and Answers|Ask Questions?|Site Map

Have Programming Question? Ask it here!

raja kiran kumar
1 Answer(s)      6 years and 2 months ago
Posted in : Java Beginners

View Answers

June 10, 2008 at 3:19 PM

Hi friend,

The assertion statement has two forms.

assert Expression1:Expression2;

The first one is a simpler form that takes a boolean expression as an argument. The expression is the one the programmer wishes to assert as true. If the assumption fails, the expression evaluates to be false which means the assertion failed. In case the expression succeeds the program continues normally.

The second form is the more descriptive one. The first argument takes a Boolean expression, while the second expression would be the resulting action to be taken if the assertion fails. The Expression2 should be a value and can also be a result of executing a function. The compiler would throw an error if the second expression returns a void value.


public class AssertionExample{

public static void main(String argv[]) throws IOException{
System.out.println("Enter your marital status: ");
int c =;
switch ((char) c) {
case 's':
case 'S': System.out.println("Single");
case 'm':
case 'M': System.out.println("Married");
case 'd':
case 'D': System.out.println("Divorced");
default: assert !true : "Invalid Option"; break;

// default: Assertion.assert(!true, "Invalid Option");
// break;


Read for more information.


Related Tutorials/Questions & Answers:
Java NotesAssertions Assertions are used to stop execution when... is to detect bugs as early as possible. Assertions provide a relatively painless... if assertions are turned on Try this program to see if assertions are turned on. 1 2
assertions - Java Beginners
assertions  can you explain me how and when assertions are usefull with an example.. Thanks in advance  Hi friend, The assertion statement has two forms. assertExpression1; assert Expression1:Expression2
Assertion in java
program! In another words we can say that assertions ensures the program... to guide the programmer. Assertions are of two types: 1) Preconditions 2) Postconditions. Preconditions are the assertions which invokes when a method
assertion in java
! In another words we can say that assertions ensures the program validity by catching... the programmer. Assertions are of two types: 1) Preconditions 2) Postconditions. Preconditions are the assertions which invokes when a method is invoked
Error processing
statements liberally to debug your own code. See Assertions. Assertions are very easy
Assertion in java
can say that assertions ensures the program validity by catching exceptions
Assertion in Java
't be a void method. Compiling Code containing assertions Compiler accept your code having assertions, if you compile it as follows... By default assertions are disabled at runtime. You can enable assertion at runtime
Fail Early, Fail Often
are (See Assertions). Learn about assertions and use them. Rigorous testing While...; use assertions to stop execution if something is wrong; use rigorous testing
Java Programming: Section 9.4
. Assertions Recall that a precondition is a condition that must... what are called assertions to a program. These assertions take the form "assert.... Otherwise, the program continues normally. Assertions are not available in Java
Design By Contract
. Assertions Perhaps the closest one can come in pure Java to implementing pre- and postconditions is to use the assert statement. See Assertions
EclipsePro Test
cases. Create new test cases by entering arguments and assertions. See
Beginners Java Tutorials - Installing JDK
assertions -da[:<packagename>...|:<classname>... assertions -esa | -enablesystemassertions enable system assertions -dsa | -disablesystemassertions disable system
Pragmatic Programmer - Java Tutorials
and create a project website for your product. Assertions Tip 33: If it can't happen, use assertions to ensure that it won't... this: Assertions add some overhead to code. Because they check for things that should
Java Assertion
assertions. How to Enable and Disable Assertion Assertion are disabled at run-time... or enable assertions is used to enable assertion during run-time execution
="1.4" option is already specified so assertions are enabled at compile time... YourProg" ("-ea" enables run-time assertions). Simple build.xml file For simple
C and C++ books-page7
the examples are thoroughly tested using random input generation and assertions
and assertions), but most of the unit test is created automatically. In addition
Text Editors
Assertions. License: Nagware. You can use the full editor for free
Java Development Kit (JDK)
are executed. java -ea MyProgShort form for allowing assertions. It's also
TextPad Editor + JDK
a mess Assertions To turn runtime assertion checking... . "-ea" is the abbreviation for Enable Assertions. If you don't know what assertions are yet, don't bother with this. Line numbers
ALL command - SQL
[:...|:] -enableassertions[:...|:] enable assertions... assertions -esa | -enablesystemassertions enable system assertions -dsa | -disablesystemassertions disable
assert In Java
, and invariants of a class. Where To Use Assertions Assertion is used in computer
Core Java Jobs at Rose India
be proficient in I/O Package Candidate must be proficient in Assertions
what is the difference between jdk 1.4 and 1.5 and 1.6
various input streams and buffers. - Assertions - StringBuilder class (in java.lang
A - Java Glossary
A - Java Glossary       Java Assertions In Java 1.4, Assertion is a keyword that is represented by a boolean expression and enables you to test your assumptions about your
Various Commands that are used in java are given below
;] enableassertions[:<packagename>...|:<classname>] enable assertions da...;packagename>...|:<classname>] disable assertions esa | -enablesystemassertions enable system assertions dsa | -disablesystemassertions disable
What is Solex ?
the attachment of assertions to responses in order to validate a scenario during
Java Keywords
with assertions . If the condition is false, the Java runtime system throws an AssertionError
Using JMeter for a Simple Test
groups, listeners, assertions, sample generating controllers, logic controllers etc
Java Notes: Table of Contents
reverse Assertions Assertions
Java Programming: Preface to the Fourth Edition
, see the documentation at Java 1.4 introduced assertions into the Java language, and I have added a short discussion of assertions in Java
What are the level in Jboss 5 application server to deploy the application
streams and buffers. - Assertions - StringBuilder class (in java.lang package
Java Training and Tutorials, Core Java Training
Assertions Errors in Integer Arithmetic
HttpUnit Test
. These assertions are taken from the Junit API.  assertEquals
OOP Tutorial [first draft]
), but the simplest is to use the assert statement (see Assertions) to stop execution.... If assertions are turned on, then the second call to the constructor should... this message." +"\nTurn assertions on when you run this program
Java Certification Books
, converting, casting, flow control, assertions, exceptions, objects, classes, threads
Java Performance Tuning - Java Tutorials
in comments. Chapter 6: Exceptions, Assertions, Casts, and Variables Many
NetBeans IDE
at the right, enter "-ea" (without the quotes). "ea" stands for enable assertions