# JUnit5 `@AfterEach`注解示例 > 原文： [https://howtodoinjava.com/junit5/after-each-annotation-example/](https://howtodoinjava.com/junit5/after-each-annotation-example/) JUnit5 [`@AfterEach`](http://junit.org/junit5/docs/current/api/org/junit/jupiter/api/AfterEach.html) 注解替换了 JUnit4 中的`@After`注解。它用于表示应在当前类中的每个`@Test`方法之后执行**注解方法**。 ## `@AfterEach`注解用法 使用`@AfterEach`注解方法，如下所示： ```java @AfterEach public void cleanUpEach(){ System.out.println("After Each cleanUpEach() method called"); } ``` 带注解的`@AfterEach`方法**不得为静态方法**，否则它将引发运行时错误。 ```java org.junit.platform.commons.JUnitException: @AfterEach method 'public static void com.howtodoinjava.junit5.examples.JUnit5AnnotationsExample.cleanUpEach()' must not be static. at org.junit.jupiter.engine.descriptor.LifecycleMethodUtils.assertNonStatic(LifecycleMethodUtils.java:73) at org.junit.jupiter.engine.descriptor.LifecycleMethodUtils.lambda$findAfterEachMethods$3(LifecycleMethodUtils.java:60) at java.util.ArrayList.forEach(ArrayList.java:1249) at java.util.Collections$UnmodifiableCollection.forEach(Collections.java:1080) at org.junit.jupiter.engine.descriptor.LifecycleMethodUtils.findAfterEachMethods(LifecycleMethodUtils.java:60) ``` ## `@AfterEach`注解示例 让我们举个例子。 我使用了一个`Calculator`类并添加了一个`add`方法。 我将使用`@RepeatedTest`注解对其进行 5 次测试。 此注解将导致`add`测试运行 5 次。 对于每次运行的测试方法，`@AfterEach`带注解的方法也应每次运行。 ```java package com.howtodoinjava.junit5.examples; import org.junit.jupiter.api.AfterAll; import org.junit.jupiter.api.AfterEach; import org.junit.jupiter.api.Assertions; import org.junit.jupiter.api.DisplayName; import org.junit.jupiter.api.RepeatedTest; import org.junit.jupiter.api.RepetitionInfo; import org.junit.jupiter.api.Test; import org.junit.jupiter.api.TestInfo; import org.junit.platform.runner.JUnitPlatform; import org.junit.runner.RunWith; @RunWith(JUnitPlatform.class) public class AfterAnnotationsTest { @DisplayName("Add operation test") @RepeatedTest(5) void addNumber(TestInfo testInfo, RepetitionInfo repetitionInfo) { System.out.println("Running test -> " + repetitionInfo.getCurrentRepetition()); Assertions.assertEquals(2, Calculator.add(1, 1), "1 + 1 should equal 2"); } @AfterAll public static void cleanUp(){ System.out.println("After All cleanUp() method called"); } @AfterEach public void cleanUpEach(){ System.out.println("After Each cleanUpEach() method called"); } } ``` 其中`Calculator`类是： ```java package com.howtodoinjava.junit5.examples; public class Calculator { public int add(int a, int b) { return a + b; } } ``` 现在执行测试，您将看到以下控制台输出： ```java Running test -> 1 After Each cleanUpEach() method called Running test -> 2 After Each cleanUpEach() method called Running test -> 3 After Each cleanUpEach() method called Running test -> 4 After Each cleanUpEach() method called Running test -> 5 After Each cleanUpEach() method called After All cleanUp() method called ``` 显然，每次测试方法调用时都将调用`@AfterEach`注解的`cleanUpEach()`方法。 学习愉快！ [源码下载](https://github.com/lokeshgupta1981/Junit5Examples/tree/master/JUnit5Examples)