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

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1. 本机的环境变量

JAVA_HOME :
D:\devSoft\Java\jdk1.6.0_37

path:
%JAVA_HOME%\bin;

classpath:
%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jar

2.在桌面上创建Test.java

public class Test {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println("ssss");
}

}

3.编译：

cd Desktop

javac Test.java 编译通过

java Test 报错：错误如下：

Exception in thread "main" java.lang.NoClassDefFoundError: Test
Caused by: java.lang.ClassNotFoundException: Test
        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)
Could not find the main class: Test. Program will exit.

求解原因，我到底哪里错了！本机系统win7 _32 ;