最近光在看別的，沒咋寫代碼，都手生了。
寫老師留的掃雷作業的測試類，在idea中直接導入了idea自帶的Junit4.12包，運行測試類時報錯
java.lang.NoClassDefFoundError: org/hamcrest/SelfDescribing
解決方法：導入idea自帶的另一個包：hamcrest-core-1.3.jar
原因：
junit.jar: Includes the Hamcrest classes. The simple all-in-one solution to get started quickly.Starting with version 4.11, Hamcrest is no longer included in this jar.
junit-dep.jar: Only includes the JUnit classes but not Hamcrest. Lets you use a different Hamcrest version.
往項目中導入jar包：
File –> Project Structure –> Modules –> dependencies –> 右側綠色加號