How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask TheDoctor Your Own Question

TheDoctor
TheDoctor, Professional w/Adv. Degree
Category: Homework
Satisfied Customers: 1426
Experience:  M.S. in Internet Information Systems
Type Your Homework Question Here...
TheDoctor is online now
A new question is answered every 9 seconds

Question for TheDoctor.

Resolved Question:

Question for TheDoctor. The file with my Java problem is located at http://ge.tt/8FmI0Bj/v/0 I need the solution by Monday 19th June. Thanks.

Submitted: 1 year ago.
Category: Homework
Expert:  TheDoctor replied 1 year ago.
Hello again! Thank you for requesting me.

I will contact you once this is complete.
Expert:  TheDoctor replied 1 year ago.

Hello again!

You can download the completed project here:

Attachment: 2013-06-12_201420_calc.zip



Within the zip file, you will find the java file, the text files, and the Microsoft Word document with testing information and conclusions.

To compile the project, you must run javac Calc.java

Once it is compiled, it must be run with the file arguments. For instance, you would run the cars one like this:

java Calc car.txt carRules.txt

And you would run the stocks one like this:

java Calc stock.txt stockRules.txt

I commented the entire project, and it meets all of the requirements.

Let me know if you have any questions. I'm here to help.

Please remember to rate my answer. Thank you so much and have a wonderful day!

Expert:  TheDoctor replied 1 year ago.
THIS ANSWER IS LOCKED!
You can view this answer by clicking here to Register or Login and paying $3.
If you've already paid for this answer, simply Login.
TheDoctor, Professional w/Adv. Degree
Category: Homework
Satisfied Customers: 1426
Experience: M.S. in Internet Information Systems
TheDoctor and 4 other Homework Specialists are ready to help you
Customer: replied 1 year ago.

Could you please explain the appended part of the code below? Why do you use rules[1] inside switch? How does this work?

//Call the rule, replace the value in the spread sheet
switch(rules[1]) {
case "mean":
sl[Integer.parseInt(rowAndColumn[1]) - 1] = mean(rules[2], rules[3]);
break;
case "max":
sl[Integer.parseInt(rowAndColumn[1]) - 1] = max(rules[2], rules[3]);
break;
case "min":
sl[Integer.parseInt(rowAndColumn[1]) - 1] = min(rules[2], rules[3]);
break;
case "sum":
sl[Integer.parseInt(rowAndColumn[1]) - 1] = sum(rules[2], rules[3]);
break;
}

Expert:  TheDoctor replied 1 year ago.
Hello again, Michael.

First, let me point out that this particular bit of code required JDK7 or higher. (JDK7 is the current).

This is a standard switch case. A switch is a basic condition structure found in almost all modern programming languages. It is a cleaner alternative to using if...else if...else if...else if...else if

Rules is an array that holds a single line from the rules file.

rules[0] is equal to the cell address
rules[1] is equal to the function that is to be performed
rules[2] is the from cell address
rules[3] is the to cell address

So, what we are saying with this is, if the function to be performed (rules[1]) is equal to mean... else if it is equal to max... else if it is equal to min... else if it is equal to sum

Strings in a switch case have been a standard part of programming for quite a long time. You will find switch cases in C++, C#, PHP, JavaScript, ActionScript, etc.

It has also been a standard part of Java for a very long time, and is usually covered in the chapter about control structures in an Java text books (this is usually in the first few chapters). However, Java was the only modern language that supported ONLY integers in switch cases.

Developers complained for well over a decade about this. After all, the switch case is considered one of the most basic and important control structures in modern programming. And Java only partially supported it.

As of JDK7, Java now fully supports the switch case (using String cases).

Most instructors would expect you to use a switch instead of a large number if if/else if statements. In addition, I have actually rejected developer code in the real world because of that. Many organization conduct code reviews wherein a senior developer or lead engineer helps review the code of more junior team members, or the entire team reviews code together. As a lead engineer, I have had to reject code due to the use of excessive if/else if statements. It is simply sloppy programming. That is why the Switch Case control structure exists in almost every modern language.

Let me know if you have any other questions.

Have a wonderful day.

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
< Last | Next >
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
  • He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here. Diane Dallas, TX
 
 
 

Meet The Experts:

 
 
 
  • Manal Elkhoshkhany

    Tutor

    Satisfied Customers:

    4520
    More than 5000 online tutoring sessions.
< Last | Next >
  • http://ww2.justanswer.com/uploads/BU/BusinessTutor/2012-2-2_115741_Kouki2.64x64.jpg Manal Elkhoshkhany's Avatar

    Manal Elkhoshkhany

    Tutor

    Satisfied Customers:

    4520
    More than 5000 online tutoring sessions.
  • http://ww2.justanswer.com/uploads/LI/lindaus/2012-6-10_04811_IMG20120609164157.64x64.jpg Linda_us's Avatar

    Linda_us

    Finance, Accounts & Homework Tutor

    Satisfied Customers:

    3121
    Post Graduate Diploma in Management (MBA)
  • http://ww2.justanswer.com/uploads/ComputersGuru/2010-02-13_051118_Photo41.JPG LogicPro's Avatar

    LogicPro

    Engineer

    Satisfied Customers:

    3035
    Expert in Java C++ C C# VB Javascript Design SQL HTML
  • http://ww2.justanswer.com/uploads/lanis/2009-4-1_233717_phput9xef_c1pm.jpg Lani S.'s Avatar

    Lani S.

    Tutor

    Satisfied Customers:

    2457
    Registered Nurse, Internet Researcher, Private Tutor
  • http://ww2.justanswer.com/uploads/chooser77/2009-08-18_162025_Chris.jpg Chris M.'s Avatar

    Chris M.

    M.S.W. Social Work

    Satisfied Customers:

    2341
    Master's Degree, strong math and writing skills, experience in one-on-one tutoring (college English)
  • http://ww2.justanswer.com/uploads/JawaadAhmed/2009-6-27_12137_SIs_SHadi.jpg F. Naz's Avatar

    F. Naz

    Chartered Accountant

    Satisfied Customers:

    1975
    Experience with chartered accountancy
  • http://ww2.justanswer.com/uploads/JK/jkcpa/2011-1-16_182614_jkcpa.64x64.jpg Bizhelp's Avatar

    Bizhelp

    CPA

    Satisfied Customers:

    1873
    Bachelors Degree and CPA with Accounting work experience