为什么老报classnotfoundexception呢？

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以下是我在环境变量里的设置，可是总是在javac编译成功后，java的时候就报错，应该是环境变量的设置有问题，可是我不觉的我哪里设置错误了啊····！请高手指教

classpath
D:/Program Files/Java/jdk1.6.0_04/lib/dt.jar;D:/Program Files/Java/jdk1.6.0_04/lib/rt.jar
javahome
D:/Program Files/Java/jdk1.6.0_04
path
%SystemRoot%/system32;%SystemRoot%;%SystemRoot%/System32/Wbem;C:/Program Files/Microsoft SQL Server/80/Tools/BINN;C:/Program Files/Common Files/Adobe/AGL;D:/Program Files/Java/jdk1.6.0_04/bin

具体DOS下执行情况如下

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D:/>javac Abc.java

D:/>java Abc
Exception in thread "main" java.lang.NoClassDefFoundError: Abc
Caused by: java.lang.ClassNotFoundException: Abc
        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)

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问题解决方法：
将PATH里的JDK路径放到系统变量前就OK了。
path
D:/Program Files/Java/jdk1.6.0_04/bin;%SystemRoot%/system32;%SystemRoot%;%SystemRoot%/System32/Wbem;C:/Program Files/Microsoft SQL Server/80/Tools/BINN;C:/Program Files/Common Files/Adobe/AGL