我先运行了下面的程序:
public class Demo {
public static void main(String[] args) throws Exception {
URL[] urls = new URL[] {new URL("file:/"+"G:/eclipses/反射/src/反射/")};
URLClassLoader loader = new URLClassLoader(urls);
Class c = loader.loadClass("Test");
}}

而且我也确实有这个.class文件。
但是eclipse不停的报错，
Exception in thread "main" java.lang.NoClassDefFoundError: Test (wrong name: 反射/Test)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at 反射.Demo.main(Demo.java:12)
这是为什么啊，我现在都想把这个JAVA给卸了，然后重新安装一个。。。。。