这个mrjar可以扩展一个jar文件的已有目录结构。它包含一个根目录，其中包含了所有的内容，以及一个META-INF目录，用于存储关于该jar文件的元数据。通常，一个jar文件包含一个META-INF/MANIFEST.MF文件，其中包含了属性。
jar文件中的条目如下：
– jar-root
– C1.class
– C2.class
– C3.class
– C4.class
– META-INF
– MANIFEST.MF
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In the above template, the jar contains four class files and a MANIFEST.MF file. The mrjar extends the META-INF directory to store classes that can be specific to the Jdk version. The META-INF directory contains version sub-directory that contains many sub-directories, each of them named the same as Jdk major version. For instance, the classes specific to Jdk 9, there is a META-INF/versions/9 directory. For classes specific to Jdk 10, there is META-INF/versions/10.
– jar-root
– C1.class
– C2.class
– C3.class
– C4.class
– META-INF
– MANIFEST.MF
– versions
– 9
– C2.class
– C5.class
– 10
– C1.class
– C2.class
– C6.class
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