配置java时出现的问题，请各位大哥大姐帮帮忙

我是java新手，刚刚配置安装好JDK 1.6.0_05,在命令提示符窗口输入“java vertion”,想看看java安装是否成功，却出现如下：
C:\Documents and Settings\zhamch>java vertion
Exception in thread "main" java.lang.NoClassDefFoundError: vertion
Caused by: java.lang.ClassNotFoundException: vertion
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClassInternal(Unknown Source)
好像是找不到java.lang的类
请各位帮帮忙啊，小弟非常感谢