An assertion is a statement in the Java TM programming language that enables you to test your assumptions about your program. For example, if you write a method that calculates the speed of a particle, you might assert that the calculated speed is less than the speed of light. See more Argument checking is typically part of the published specifications (or contract) of a method, and these specifications must be obeyed whether assertions are enabled or disabled. Another problem with using assertions for … See more The simple assertion facility does enable a limited form of design-by-contract style programming. The assert statement is appropriate for nonpublic precondition, postcondition and class invariant checking. Public precondition … See more Because assertions may be disabled, programs must not assume that the boolean expression contained in an assertion will be evaluated. Violating this rule has dire … See more As a rule, the expressions contained in assertions should be free of side effects: evaluating the expression should not affect any state that is visible after the evaluation is complete. One … See more WebAug 19, 2011 · Add a comment 28 The assertNotNull () method means "a passed parameter must not be null ": if it is null then the test case fails. The assertNull () method means "a passed parameter must be null ": if it is not null then the test case fails.
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