Assertion Error In Java
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Method java.lang Class AssertionError java.lang.Object java.lang.Throwable java.lang.Error java.lang.AssertionError All Implemented Interfaces: Serializable
Assertion Error In Java Example
public class AssertionError extends Error Thrown to indicate that java assertionerror an assertion has failed. The seven one-argument public constructors provided by this class java assertion error vs exception ensure that the assertion error returned by the invocation: new AssertionError(expression) has as its detail message the string conversion of expression
Assertion Error Python
(as defined in section 15.18.1.1 of The Java™ Language Specification), regardless of the type of expression. Since: 1.4 See Also:Serialized Form Constructor Summary Constructors Constructor and Description AssertionError() Constructs an AssertionError with no detail message. AssertionError(booleandetailMessage) Constructs an AssertionError with its detail
Assertion Error Junit
message derived from the specified boolean, which is converted to a string as defined in section 15.18.1.1 of The Java™ Language Specification. AssertionError(chardetailMessage) Constructs an AssertionError with its detail message derived from the specified char, which is converted to a string as defined in section 15.18.1.1 of The Java™ Language Specification. AssertionError(doubledetailMessage) Constructs an AssertionError with its detail message derived from the specified double, which is converted to a string as defined in section 15.18.1.1 of The Java™ Language Specification. AssertionError(floatdetailMessage) Constructs an AssertionError with its detail message derived from the specified float, which is converted to a string as defined in section 15.18.1.1 of The Java™ Language Specification. AssertionError(intdetailMessage) Constructs an AssertionError with its detail message derived from the specified int, which i
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Java.lang.assertionerror Junit
with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack how to handle assertion error in java Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up What is an AssertionError? In which case should I throw it from https://docs.oracle.com/javase/7/docs/api/java/lang/AssertionError.html my own code? up vote 24 down vote favorite 5 In Item 2 of the "Effective Java, 2nd edition" book, there is this snippet of code, in which the author wants to forbid the empty initialization of an object. class Example { private Example() { throw new AssertionError(); } } The type of exception thrown, is what confuses me here. I don't understand if the AssertionError is thrown just http://stackoverflow.com/questions/24863185/what-is-an-assertionerror-in-which-case-should-i-throw-it-from-my-own-code because of an absence of more suited errors or because it should be this way. As I understand, this error is thrown by the framework when an assert statement fails. Also, in the javadoc it's just written [An AssertionError is] Thrown to indicate that an assertion has failed. But I don't see any assertion (true-false statement) being violated here. Of course the "You shall not instantiate an item of this class" statement has been violated, but if this is the logic behind that, then we should all throw AssertionErrors everywhere, and that is obviously not what happens. FWIW, I'd have just thrown a new IllegalStateException("Must not instantiate an element of this class") Is there something wrong with that? In which case should I throw an AssertionError in my own code? Sorry if it's just a subtle doubt but I use this pattern a lot in my code and I want to make sure I'm doing the right thing. java exception effective-java share|improve this question edited Jul 21 '14 at 11:03 asked Jul 21 '14 at 10:43 doplumi 88721131 1 "Assertions" doesn't just mean "assert statements". –immibis Jul 21 '14 at 10:45 add a comment| 3 Answers 3 active oldest votes up vote 18 down
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About http://stackoverflow.com/questions/22053306/using-assertionerror-and-assertions-in-java Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Using AssertionError and assertions in assertion error java up vote 13 down vote favorite 4 I use assertions in Java in a standard way, having them turned on in my IDE. So they are not part of production release. Lately I have been seeing code examples with throw new AssertionError() and I started thinking about the situation where AssertionError should be used instead of assertion. My guess is that main difference is the assertion error in optionality of asserts so they don't slow down the production performance and so they can occur quite often in the code, but fixing hardly reproducible bugs reported from users is harder. For AssertionError, the exact opposite applies. I also find AssertionError more practical in places in code where the execution should not get, instead of using assert false //We should not be here. Especially if the return value is required. For example: int getFoo(AnEnum a){ if (a == AnEnum.ONE) return bar(); else if (a == AnEnum.TWO) return SOME_VALUE; //else assert false; //throw new AssertionError(); return -1; //not necessary when usin AssertionError } Is my reasoning correct? What are the other differences/use cases/best practices/limitations of either approach? In regards to providing a description in the AssertionError - Should it be provided or is the mere fact that it is an Error (and of assertion type) enough to be more or less sure that stack trace will be provided in case of found bugs? java exception-handling assertions share|improve this question edited Feb 26 '14 at 21:16 mdewitt 1,6461019 asked Feb 26 '14 at 21:08 dev-null 1,88721641 6 How often are your assertions actually slow? Personally