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java -verbose:class XXX（类名）

[Opened C:\Program Files\Java\jdk1.8.0_221\jre\lib\rt.jar]

[Loaded java.lang.Object from C:\Program Files\Java\jdk1.8.0_221\jre\lib\rt.jar]

[Loaded java.io.Serializable from C:\Program Files\Java\jdk1.8.0_221\jre\lib\rt.jar]

[Loaded java.lang.Comparable from C:\Program Files\Java\jdk1.8.0_221\jre\lib\rt.jar]

[Loaded java.lang.CharSequence from C:\Program Files\Java\jdk1.8.0_221\jre\lib\rt.jar]

[Loaded java.lang.String from C:\Program Files\Java\jdk1.8.0_221\jre\lib\rt.jar]

[Loaded java.lang.reflect.AnnotatedElement from C:\Program Files\Java\jdk1.8.0_221\jre\lib\rt.jar]

[Loaded java.lang.reflect.GenericDeclaration from C:\Program Files\Java\jdk1.8.0_221\jre\lib\rt.jar]

[Loaded java.lang.reflect.Type from C:\Program Files\Java\jdk1.8.0_221\jre\lib\rt.jar]

[Loaded java.lang.Class from C:\Program Files\Java\jdk1.8.0_221\jre\lib\rt.jar]

…

补充说明一点东西：

rt.jar（runtime.jar）是Java 程序运行所必须的库

老外称之为 essential

有点类似于C语言的<stdio.h>

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