java类加载器结构

public class classerloadertest{    // 清单 1. 演示类加载器的树状组织结构    public static void main(string[] args)    {        classloader loader = classerloadertest.class.getclassloader();        while (loader != null)        {            system.out.println(loader.tostring());            loader = loader.getparent();        }    }}