Notice that there is no output for the bootstrap class loader.

请注意，引导类装入器没有输出。

youdao

When there is a hierarchy of class loaders, the root class loader, which is the bootstrap class loader, attempts to load the class first.

当类加载器存在一个层次结构时，根类加载器(即引导类加载器)将首先尝试加载类。

youdao

When there is a hierarchy of class loaders, the root class loader, which is the bootstrap class loader, attempts to load the class first.

当类加载器存在一个层次结构时，根类加载器(即引导类加载器)将首先尝试加载类。

youdao