javac

面向文件路径
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java

面向包
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配置环境变量ClassPath,添加指定包名
Java调用类和包的顺序：
java\lib\ext中—->Manifest.mf(jar包配置文件)指定的(类或者包)—>当前目录中(是否有类或者包)—>环境变量CLASSPATH中指定(是否有类或者包)

  1. Manifest-Version: 1.0
  2. Created-By: 1.8.0_311 (Oracle Corporation)
  3. Class-Path: B.jar(指定类或者包)

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