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This article shows you the difference between @ AfterClass and @ BeforeClass in JUnit4. The content is concise and easy to understand. It will definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

JUnit4 uses the annotations in Java5 (annotation). Here are some annotation commonly used by JUnit4:

Before: initialization methods are executed once for each test method (note the difference from BeforeClass, which is executed once for all methods)

After: releasing resources is executed once for each test method (note the difference from AfterClass, which is executed once for all methods)

@ Test: test method, where you can test expected exceptions and timeouts

@ Test (expected=ArithmeticException.class) checks whether the method under test throws an ArithmeticException exception

@ Ignore: ignored test method

@ BeforeClass: execute only once for all tests, and must be static void

@ AfterClass: execute only once for all tests, and must be static void

The execution order of a unit test case for a JUnit4 is:

@ BeforeClass-> @ Before-> @ Test-> @ After-> @ AfterClass

The order in which each test method is called is:

@ Before-> @ Test-> @ After

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