Java 每个ClassLoad 加载的文件（夹）都有哪些

public static void main(String[] args) {
        URL[] urLs = Launcher.getBootstrapClassPath().getURLs();
        System.out.println("启动类加载器加载的jar：");
        for (URL urL : urLs) {
            System.out.println("==> " + urL.toExternalForm());
        }
        printClassLoader("扩展类加载器和其加载的jar:", ClassLoaderJarPrint.class.getClassLoader().getParent());
        printClassLoader("应用类加载器和其加载的jar:", ClassLoaderJarPrint.class.getClassLoader());
    }

此处省略 ClassLoaderJarPrint#printClassLoader 的方法，我们通过断点的形式查看