rewrite exe class

CIT 38800 Java II

Programming Assignment #04 (Varies according to how used…see last page)

File Handling and Exception Processing

For this project, you will re- use all of the files from Project #03 (instructor’s versions…not yours), except the executable class. Your assignment is to re-code the executable class to read a single (1) text file and create two (2) text output files. All files must be comma delimited…commas must separate each input and/or output field with no extra spaces. To accomplish this task, you also must retain the polymorphic functionality coded in the Project #03 as supplied by your instructor. The valid output file (more later) MUSTbe written from a Rocks array in the same fashion as the screen output was written in Project 03 except this time it is going to a file.

• Note: Write only the four indicated fields to the output file (see file specifications later) in order to save time for completion of this project.

• Write each field in the order indicated at the bottom of this document with NO headings and no extra spaces formatted as indicated! Use a SINGLE UNIQUE ROW for each record that is output. Again…each output field must be delimited by a single comma with no extra spaces.

You must perform the following tasks:

Create a console-mode executable class (no GUI in this project; let’s keep it simple) using the following specifications:

• Name your executable class RockFiles

• Prompt the user to enter the full (absolute) path and filename of the input file to read

o Read the path/file name from the keyboard and use it for opening and processing the input file

o The input file will contain an unknown number of rows up to a maximum of 200 that will contain both good and bad data

o Using ONLY File class supplied methods, test for file’s existence and the fact that it isa file MUST be verified PRIORto opening the file.

§ If file does not exist OR if the user entry is not a file, exit the program immediately (do not try opening the file) and supply an appropriate message to the screen explaining that they program is terminating and why.

• Hard-code(do not prompt for & read) the absolute path and name of the firstoutputfile.

o Must be called validRecords.csv and placed in the root directory of the “D:” drive.

§ Use code that will allow it to be used on as many platforms as you can; don’t hard code the separator ( or /)…demonstrated in class.

o This is where you will write your “valid” records from your array of type Rocks (the interface from the last project)…yes, you again are using polymorphism.

• Hard-codethe absolute path and name of a second output file.

o Must be called suspense.csv and must also be placed in the root directory of the “D:” drive.

§ This file will hold ALL records with formatting issues (wrong type of data in a field), and/or the wrong number of fields necessary to instantiate ANY of the 3 classes used.

§ Hint: If a Monument object is to be instantiated and placed into the array, how many fields should be onthe input line? What about the MonumentBase class? You are still only to use the largest constructors of each class.

• Create an array of type Rocks FROM THE VALID INPUT LINES ONLY (based upon the above two qualifiers) in the same manner as the supplied Project 03 executable class; after you validate the line and determine it is OK, just instantiate the appropriate object and add the object to the array.

o You must determine if a line is valid by using exception processing (when appropriate) AND field (token) counting (when appropriate) and any bad data lines are to be written to suspense.csv EXACTLY AS THEY ARE/EXIST

IN THE INPUT FILE…just write the entire input String row itself without any changes.

§ For a full description of bad data, see below

§ The input file layout that must be used follows at the end of this document

• Write to the “bad data” (suspense.csv) file, each line written EXACTLY as it exists in the input file, when a line contains:

o The incorrect number of fields to instantiate EITHER of the 2 object types…Monument or MonumentBase

o ORCharacter or String data in a numeric field (improper format)

o ORfloating point data in an integer field (improper format)

§ Do not worry about any other data checks; the above three are sufficient for this project to cut down on programming time.

• Create a second file (validRecords.csv), WRITING IT FROM YOUR Rocks array AFTER THE ARRAY HAS BEEN CREATED IN ITS ENTIRETY(entire input file processed), which contains all validrecords/lines (and ONLY validrecords) from the input file.

o This must be the LAST function of your program and written only after the Rocks Array has been satisfactorily

completed; write it from a single loop that does nothing else but write the file.oA record is valid when it passes the aforementioned data checks.

§ This, obviously, must be written using the appropriate get methods that already exist in the 2 classes being instantiated and placed into the Rocks array, to build the entire line of text/record to be written.

§ Using any way other than the existing get methods to obtain/write this data will invalidate your project

§ Hint:Build one long String using your get methods and write the single String. Look at the previous

projects; this has been done before.

o All formatting (including decimal places) must be followed (as seen in the sample output file) to receive full credit

• Use exception processing/handling for possible I/O exceptions.

o All checked exceptions MUST be handled…not just registered.

oAll possible data formatting exceptions (a float where an int should be etc.) must be handled. oSimply registering an exception is insufficient.

o Handle possible I/O (file opening, closing, reading, writing, etc.) exceptions by displaying the stack trace information to the screen (seen in class), followed by an appropriate exiting message, and terminating the program.

• Do not use the Exception superclass as the initial catch data type for ANY exception processing. It may be used as a final “cleanup” type if desired (not required). Specific exceptions must be used.

• Do NOT place any more code than is necessary within your try blocks; think!

o Too much code in a try block will result in a one point penalty for each statement that should not (in the instructor’s opinion) be in the block.

• All files must be written as text by writing a SINGLE ENTIRE TEXT LINE (one record) with each write…not character by character or value by value.

• You must use the classes and interfaces from lab #03 AS SUPPLIED BY THE INSTRUCTOR for this project.

o Obviously the exception is the driver/executable class…it is not used at all, but a great deal of the code from it will probably be useful in this project. For example you can use a lot of the display code to build the String to write to the file that will contain valid output.

• All previous lab (“shop”) rules must be adhered to; be sure to check the list!

• Since this lab has several goals (using exception processing/handling, tokenization, and file handling) all of the following MUSTbe demonstrated:

o Handling exceptions.

§ Note: All exceptions must be handled by “catching” the exact exception that might be thrown.

o File handling.

§ Proper opening and closing of files.

• You must verify that the input file exists and IS a file.

§ Reading a complete line from a text file.

§ Writing to a text file an entire line/record per write.oTokenization creation & token handling.

• Also…methods, classes, or techniques not covered in class or in the text chapters covered may NOT be used. I want to see you have mastered techniques we have covered.

• Modifying ANY of the instructor-supplied code (except the executable class) is not allowed and a grade of zero (0) will result.

o It won’t run if you modify the supplied code since you are only sending me the executable class.

• Asking for any input from the user, other than the single input file path & name is not allowed.

• Place ONLY your executable class source file (RockFiles.java) in the assignment area. One file only should be submitted! Since it must work with my supplied classes I will use my copies. Submit the project no later than 5:00 PM on Monday

April 30^th; no project will be accepted late or incomplete.

Tips:

1. Start this one early; it has a few twists and turns

1. When you are writing text files for this project, each line being written must be a String. You will need to build each line of output as a String prior to writing it. You have seen this done in class on more than one occasion.
2. There is a STRONG possibility that you will be seeing one or NULLPOINTEREXCEPTIONs as you progress. Remember…these typically occur when you are trying to access an element of an array of objects that is NULL; contains no object/value. Remember to process your array until it finds a null element then stop.

Input File Layout (all fields are delimited by a single comma; no spaces between fields)

REMEMBER THAT NOT ALL FIELDS WILL EXIST IN EVERY LINE/RECORD

Quantity	Monument Width	Monument Thickness	Monument Height	Base Thickness	Base Diameter
(# of monuments &	(data type: double)	(data type double)	(data type double)	(data type double)	(data type double)
bases if bases apply)
(data type: int)

Look at the following examples and let’s discuss the data:

40,44.75,13.5,38,12,65

25,40,13.5,36.75,12

30,42.7,15,34.25

22,44.6,25A,43.78,13,66.5

33.5,57.6,14.8,37.5

77,50.o,15,55

6,46,12,44,14,64

12,44,14,45,16,62

Output File Layout (all fields are delimited by a single comma; no spaces between fields)

Display ONLY the following fields (yes…in the real world it would be more!)

Order Number	Quantity Ordered	Total Cubic Feet of WunderRock	Total Price
(data type int)	(data type int)	(data type double)
Just start at 1000 and add 5 for each
additional order
No Special formatting	No special formatting	Format to 3 decimal places	Format to two decimal places

Look at the following example and let’s discuss. Each field must be delimited by a comma. Obviously the “x’s” must be replaced by valid data.

1000,xx,xxx.xxx,xxxxx.xx

1005,xx,xxxx.xxx,xxxxxxx.xx

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