classpath、package总结//TODO参考文件：http://docs.oracle.com/javase/1.4.2/docs/tooldocs/windows/class
classpath、package总结
//TODO
参考文件：
http://docs.oracle.com/javase/1.4.2/docs/tooldocs/windows/classpath.html
http://www3.ntu.edu.sg/home/ehchua/programming/java/J9c_PackageClasspath.html