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Message: [QUOTE="Xiaoshen Li, post: 641613"] Dear All, I am learning package name and have been puzzled a lot. I have asked similar questions before, based on the replies, I have made some progress. *****************WHAT I CAN MAKE IT WORK:************************ (No CLASSPATH environment was set) In the directory ~/programming/java/Tools/ I have a java file SavitchIn.java with the line on the top: package Tools.SavitchTools; Compiling this file generate a class as: ~/programming/java/Tools/classes/Tools/SavitchTools/SavitchIn.class (Now still working at ~/programming/java/Tools/). A file Test.java with a import line on the top: import Tools.SavitchTools.SavitchIn; javac -classpath ./classes/ Test.java works great. (Question 1: why the generated Test.class is not put in the current directory, instead is in ./classes ?) Anyway, java ./classes/Test Works great. *******************WHAT I CANNOT MAKE IT WORK******************** If I am working in a far away directory ~/programming/java/other_projects/test_package/ Same Test.java file including the same import statement: import Tools.SavitchTools.SavitchIn; javac -classpath ./../../Tools/classes Test.java No error message at all. Test.class was generated and put in the current directory. (Question 2: why this time not put in ./classes, instead put in the current directory? ./classes exists.) java Test get error messages: Exception in thread "main" java.lang.NoClassDefFoundError: Tools/SavitchTools/SavitchIn at Test_Package.main(Test_Package.java:8) My guess is linking problem. Question 3: why executing failed? How to make it work? Thank you very much for your help. [/QUOTE]

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