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

请注意，引导类装入器没有输出。

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The extension class loader (also known as the standard extensions class loader) is a child of the bootstrap class loader.

扩展（extension）类装入器（也称作标准扩展 类装入器）是引导类装入器的一个孩子。

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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。

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Bootstrap isn't the only class loader.

引导程序不是唯一的类装入器。

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Each class loader also keeps a reference to a parent class loader, defining a tree of class loaders with the bootstrap loader at the root.

每个类装入器还保留对父类装入器的引用，这样就定义了类装入器树，树根为引导程序装入器。

youdao

Each class loader also keeps a reference to a parent class loader, defining a tree of class loaders with the bootstrap loader at the root.

每个类装入器还保留对父类装入器的引用，这样就定义了类装入器树，树根为引导程序装入器。

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