我将一个简单的本地JAVA文件上传到Linux下运行，发现报“Error: Could not find or load main class”，而我用java -version和javac -version都能正常显示JVM的版本号。而在另一台机器上却能正常运行。
网上查资料说是classpath的问题，于是java -class . TheClassName或java -class TheCurrentDir TheClassName即可正常运行，所以基本能确认是classpath的问题，于是echo $CLASSPATH将两台机器的CLASSPATH打印出来，发现不能正确运行java TheClassName的机器少了“.:”，于是我先运行export CLASSPATH=.:$CLASSPATH，再执行java TheClassName正常。
附Linux和Windows下输出环境变量的区别：
Linux下变量前量加上$符，而Windows则用两个%将变量夹起来，如shell下用echo $PATH输出path的值，windows的cmd下则是用echo %PATH%。
参考文章：http://stackoverflow.com/questions/7485670/error-could-not-find-or-load-main-class
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