导入org.junit无法解析 [英] The import org.junit cannot be resolved

问题描述

我需要解决一个java问题的面试，他们已经寄给我测试类。它以

I need to solve a java problem for an interview, and they have sent me the test class. It starts with

import org.junit.Before;

，并在地点也有以下语法：

and also has the following syntax at places:

@RunWith(JUnit4.class)
...
@Before
...
@Test

我在一段时间内没有使用Java，所以这让我有点困惑。我下载了eclipse，当我尝试编译这个测试文件时，导入和@符号都有错误。导入错误抛出：

I haven't used Java in a while so this confuses me a little. I downloaded eclipse and when I try to compile this test file there's errors at the import and at the @ signs. The import error throws:

The import org.junit cannot be resolved.

@RunWith甚至无法识别，因为它尝试将其解析为类型。

And the @RunWith is not even recognized because it tries to resolve it to a type.

推荐答案

您需要将 junit 库添加到项目的类路径。根据您的开发设置，有几个选择可以实现。

You need to add junit library to the classpath of your project. There are several choices to achieve it depending on your development setup.

1. 命令行：在命令行调用的情况下，您必须使用 java -cp / path / to / junit将 junit.jar 添加到应用程序的类路径中。罐。请查看此处的答案。

1. Command line: In the case of command line invocations, you will have to add junit.jar to the classpath of your application with java -cp /path/to/junit.jar. Take a look at the answers here.

使用eclipse ：Eclipse发行版与该库捆绑在一起，这是您可以将其用于项目的方式。右键单击eclipse项目并导航：

Using eclipse: Eclipse distributions are bundled with this library and this is how you can use it for your project. Right click on the eclipse project and navigate:

属性 - > Java构建路径 - >库 - >添加库 - > JUnit - >
Junit 3/4

Properties -> Java Build Path -> Libraries -> Add Library -> JUnit -> Junit 3/4

在要使用的场景中不同版本的jar，而不是点击添加库，您应该点击添加外部Jar ，并在文件系统上找到库。

In the scenarios where you want to use a different version of the jar, instead of clicking on Add Library above you should click on Add External Jar and locate the library on the file system.

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