E:\java 的目录

2017/08/03 13:31 <DIR> .

2017/08/03 13:31 <DIR> ..

2017/08/03 13:31 411 HelloImooc.class

2017/08/03 12:51 105 HelloImooc.java

2 个文件 516 字节

2 个目录 129,790,992,384 可用字节

E:\java>java HelloImooc

Exception in thread "main" java.lang.NoClassDefFoundError: HelloImo

Caused by: java.lang.ClassNotFoundException: HelloImooc

at java.net.URLClassLoader$1.run(Unknown Source)

at java.security.AccessController.doPrivileged(Native Metho

at java.net.URLClassLoader.findClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Sourc

at java.lang.ClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClassInternal(Unknown Source)

Could not find the main class: HelloImooc. Program will exit.

为什么出现这个..

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Exception in thread "main" java.lang.