How to allow users to input their own data.

Question

I was taught a way to allow users to put in their own input instead of giving them a set variable. So instead of giving a user the set name "Sam" they could put "Dan" or "Shrek" etc... However when I put the code in it pops up as an error. The code for reference is DataIn.readln(); If someone can help me understand what he did and how to either replicate or fix this mysterious problem. Or if there is a better way to do whole thing then I am happy to learn. I remember BufferedReader being a part of this however I have no idea where this comes into play.

Answer 1

You can do interactive IO from the console using the console object.... here is a class that

allows standing keyboard input for a string, integer, or floating point value...

import java.io.*;

public class InputOutputIO

{

private Console console;

private boolean input_error_flag;

InputOutputIO()

{

console = System.console();

input_error_flag = false;

}

public String promptForString( String promptMsg)

{

String inbuff;

input_error_flag = false;

System.out.println("**************************************");

System.out.print(promptMsg);

try

{

inbuff = console.readLine();

}

catch (Exception ex)

{

inbuff = null;

input_error_flag = true;

System.out.println(" Input exception error has occured ");

}

return(inbuff);

}

public long promptForInteger( String promptMsg)

{

input_error_flag = false;

String inbuff = this.promptForString(promptMsg);

if (inbuff != null)

{

return(Long.parseLong(inbuff));

}

else

{

return(0);

}

}

public double promptForAmount( String promptMsg)

{

input_error_flag = false;

String inbuff = this.promptForString(promptMsg);

if (inbuff != null)

{

return(Double.parseDouble(inbuff));

}

else

{

return(0);

}

}

public static void main( String args[])

{

InputOutputIO myIO = new InputOutputIO();

String nameStr = myIO.promptForString(" What is your name ??? :>");

long longIntNum = myIO.promptForInteger(" Please input an integer :> ");

double dblFlAmt = myIO.promptForAmount(" Please input an amount :> ");

System.out.println(" Hello " + nameStr);

System.out.println(" long int # = " + longIntNum);

System.out.println(" amount = "+ dblFlAmt );

}

}