Notice that there is no output for the bootstrap class loader.
请注意，引导类装入器没有输出。
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。
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。
Bootstrap isn't the only class loader.
引导程序不是唯一的类装入器。
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。
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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