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what is the difference between java assert and if () {} else exit;?
can i just use if () {} else exit instead of assert ?
549
That an “Assert” is used only for validations, where an “If” clause is used for the logic within our code. We can use an “If” clause to determine whether our automation should follow one path or another, but an “Assert” statement to validate the elements within those paths.
An assertion is a statement in Java which ensures the correctness of any assumptions which have been done in the program. When an assertion is executed, it is assumed to be true. If the assertion is false, the JVM will throw an Assertion error. It finds it application primarily in the testing purposes.
Difference between Assert and Verify in selenium These assertions are used as checkpoints for testing or validating business-critical transactions. In case of verify, tests will continue to run until the last test is executed even if assert conditions are not met.
An assertion allows testing the correctness of any assumptions that have been made in the program. An assertion is achieved using the assert statement in Java. While executing assertion, it is believed to be true. If it fails, JVM throws an error named AssertionError.
A bit of google maybe ?
" The main thing you should keep in mind is that the if-else statement should be used for program flow control and the assert keyword should only be used for testing purposes. You should never use asserts to actually perform any operation required for your application to work properly. According to Sun's official Java documentation: "Each assertion contains a boolean expression that you believe will be true when the assertion executes." "
Read more: http://wiki.answers.com/Q/What_is_the_difference_between_assert_keyword_and_if_keyword_in_java#ixzz1v2GGfAhq
61
you could, assert is specifically designed to assert some part of code,
assert will throw AssertionError if it fails to assert
Also See
assert reference
40
I can just ignore the assertion
class A{
public static void main(String[] args) {
assert false;
System.out.println("hi");
}
}
This code will print hi by default
$ java -cp . A
hi
$ java -ea -cp . A
Exception in thread "main" java.lang.AssertionError
at A.main(A.java:6)
can I just use
if () {} else exitinstead ofassert?
Yes you could, but ...
you wouldn't be able to turn of the test unless you made the condition depend on an extra flag (which makes it more complicated, etc),
you wouldn't get a chance to perform tidy-up in any enclosing finally block,
it would be more complicated to log the cause of the problem than if an AssertionError (or any other exception) was thrown, and
if your code needed to be reused (as-is) in another application, your calls to exit could be problematic.
27
if-else is for controlling the flow of your program. assert must not be used for this! Asserts are just for having "checkpoints" in your code to check conditions which "should always" match.
Asserts can be turned on or off when running a program so that you could enable the asserts on your development machine/integration environment and disable them in the released version.
31
The assert keyword will only trigger an exception when you enable the assertions with -ea on the command line. The if/else will always execute. On top of that the assert keyword allows to write less verbose code. Compare:
assert parameter != null;
to:
if( parameter != null )
{
}
else
{
}
Asserts are ignored unless the -ea param is passed:
java -ea myjar.jar
That way, you can use them when you are testing your application, but ignore them at other times.
44
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