Interactive prompts from command line?

Posted on 2002-04-24
Last Modified: 2007-12-19
Hi there,

I have written a program that runs on a Unix commandline. Sadly I have to parse it over 15 arguments when I run it. Is there anyway that I can in my main method get the program to run and then print line a prompt statement telling a user which parameter to enter so that I can then pump this into a variable for use? ie on the command line I want to see the following:

>java comparator --run the program
>Please enter Value 1: 3 --user enters this value
>Please enter output dir: c:\oput\ --user enters this
>Please.... etc etc

I assume I will need some kind of While statement?

Does anyone have a clue what i'm on about? Can anyone help?

Many Thanks...............
Question by:luinzi
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 2
LVL 16

Expert Comment

ID: 6965355
you can use

System.out.print("Please enter Value 1:");;

Author Comment

ID: 6965371
Thats great but I want to enter strings.

This is what I have done so far:

          InputStream f;

          String a;

          while ((a = != null)
               System.out.println("Enter Value: ");

          System.out.println("Value entered was: "+ a);

It thinks I'm trying to enter an integer?

C:\jdk1.3\bin\ incompatible types
found   : int
required: java.lang.String
          while ((a = != null)
1 error

I don't even know if this is the right way of going about it? How would I use the
LVL 16

Expert Comment

ID: 6965398
for reading you can use

BufferedReader reader = new BufferedReader(new InputStreamReader(;
String st = reader.readLine();
The Ultimate Checklist to Optimize Your Website

Websites are getting bigger and complicated by the day. Video, images, custom fonts are all great for showcasing your product/service. But the price to pay in terms of reduced page load times and ultimately, decreased sales, can lead to some difficult decisions about what to cut.

LVL 16

Accepted Solution

heyhey_ earned 70 total points
ID: 6965401
of course you must add some exception handling code

      BufferedReader reader = new BufferedReader(new InputStreamReader(;
      String name = reader.readLine();
    catch (IOException x)

Author Comment

ID: 6965413
Got it working! Thanks..................
LVL 16

Expert Comment

ID: 6965415
so why did you give me grade B ?

Featured Post

Salesforce Has Never Been Easier

Improve and reinforce salesforce training & adoption using WalkMe's digital adoption platform. Start saving on costly employee training by creating fast intuitive Walk-Thrus for Salesforce. Claim your Free Account Now

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Go is an acronym of golang, is a programming language developed Google in 2007. Go is a new language that is mostly in the C family, with significant input from Pascal/Modula/Oberon family. Hence Go arisen as low-level language with fast compilation…
In this post we will learn different types of Android Layout and some basics of an Android App.
Viewers learn about the “for” loop and how it works in Java. By comparing it to the while loop learned before, viewers can make the transition easily. You will learn about the formatting of the for loop as we write a program that prints even numbers…
This tutorial covers a practical example of lazy loading technique and early loading technique in a Singleton Design Pattern.

705 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question