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You need to create a subdirectory called funList and move IntList.java into it.  The full class name for IntList is now funlist.IntList.

Reopen the file in the funList subdirectory. Now compile again. You should get error messages saying  it can't find class IntListVisitor and class ConsIntList this time.  You will need to package all the other classes/intefaces and move them into appropriate subdirectories.

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• 3. To add the whole funlist package to the project, use the File/Open Folder and select the folder src (and be sure the check the Open folder recursively checkbox). All the java files in funlist should be displayed. Save the project.  Compile the project by clicking on the Compile Project button.  Everything should compile.  Check the subdirectory bin to see all the class files generated by the compiler.

Now let's write a list visitor to compute the length of a list and add it to the project.

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Save it in a subdirectory of funlist called visitor. The full class name for GetLength and GetLengthHelp are now funlist.visitor.GetLength and funlist.visitor.GetLengthHelp, respectively. Note that GetLength is public while GetLengthHelp is package private. Now try to compile it! You will see a few error messages. Fix the errors until everything compiles.

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