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Re: i need help figuring out what is wrong in my code

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On 12/12/2016 12:52 PM, Karim omar wrote:
> [...]
> ok i got your point , my problem is with the input which saved in the variable reply in my code and executed by the findInLine method but still i don`t know how to solve it , i tried everything i know but still not working mean while the following basic oracle program is working just fine while i am using the same technique
>
> import java.util.Scanner;
> import java.util.Random;
>
> public class IfScannerRandomProg {
>
> 	public static void main(String[] args) {
> 		
> 		Scanner myScanner = new Scanner (System.in);
> 		Random myRandom = new Random ();
> 		
> 		int randomNum;
> 		
> 		System.out.println("What is your name?");
> 		
> 		String herName = myScanner.nextLine();
> 		
> 		System.out.println("hi " + herName +"," + " How are you doing today?");
> 		
> 		String   Answer1= myScanner.nextLine();
> 		
> 		System.out.println("Great, would you like to know your luck for today " + herName +"?" + "(Y/N)");
> 		
> 		char Answer2 = myScanner.findInLine(".").charAt(0);
> 		
> 		if(Answer2 == 'Y' || Answer2 == 'y'){
> 			System.out.println("Umm ......");
> 		}
> 		else{
> 			System.out.println("Ok then ,See you tomorrow!");
> 		}
>[...]

     Since you're learning, here's an important technique: When you
have a piece of code X that works and a similar piece Y that doesn't,
pay attention to the two pieces X and Y differ.  They will usually
differ in many ways, so the trick is to focus on the parts of X and Y
that seem to be connected with the problem, while ignoring the rest.
In your case, one piece of code uses a random number generator while
the other does not -- but since your trouble seems to be with input
and not with random numbers, that's something to ignore.  Since the
trouble is with input and since both programs get their input through
a Scanner, study what they do differently with that Scanner:

     Your working program creates the Scanner, calls nextLine() twice,
and then calls findInLine().

     Your failing program creates the Scanner, calls nextInt() once,
and then calls findInLine().

     What's the difference?  Two nextLine() calls versus one nextInt()
call.  We may well guess that the two versus one isn't the issue (you
could test that by modifying the working program to skip one of the
two), so the focus turns to: "How do nextLine() and nextInt() differ?"

     Like the X and Y programs, these two methods differ in many ways:
One returns a String, one returns an int, the circumstances under which
they'll throw exceptions are different, and so on.  But the failure
doesn't occur on those calls, but on the findInLine() call that comes
after nextInt() (while findInLine() after nextLine() succeeds).  This
suggests that nextLine() and nextInt() leave the Scanner in different
states: In one state the findInLine() finds something, while in the
other it does not.  So the question now becomes: "What is the Scanner's
state after nextLine(), and how does it differ from the state after
nextInt()?"

     Consider that question (my first response had some information
that might help you), and see where it leads you.

-- 
esosman@comcast-dot-net.invalid
"Nobody ever went broke underestimating the intelligence of the
American public." -- HLM (paraphrased)

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i need help figuring out what is wrong in my code Karim omar <karimyousrymohamedomar@gmail.com> - 2016-12-12 08:13 -0800
  Re: i need help figuring out what is wrong in my code Karim omar <karimyousrymohamedomar@gmail.com> - 2016-12-12 08:15 -0800
    Re: i need help figuring out what is wrong in my code Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-12-12 11:27 -0500
  Re: i need help figuring out what is wrong in my code Karim omar <karimyousrymohamedomar@gmail.com> - 2016-12-12 08:54 -0800
    Re: i need help figuring out what is wrong in my code Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-12-12 12:02 -0500
      Re: i need help figuring out what is wrong in my code Karim omar <karimyousrymohamedomar@gmail.com> - 2016-12-12 09:06 -0800
        Re: i need help figuring out what is wrong in my code Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-12-12 12:40 -0500
          Re: i need help figuring out what is wrong in my code Karim omar <karimyousrymohamedomar@gmail.com> - 2016-12-12 09:52 -0800
            Re: i need help figuring out what is wrong in my code Eric Douglas <e.d.programmer@gmail.com> - 2016-12-12 10:21 -0800
            Re: i need help figuring out what is wrong in my code Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-12-12 13:36 -0500
              Re: i need help figuring out what is wrong in my code Karim omar <karimyousrymohamedomar@gmail.com> - 2016-12-12 12:28 -0800
                Re: i need help figuring out what is wrong in my code Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-12-12 16:28 -0500
                Re: i need help figuring out what is wrong in my code Karim omar <karimyousrymohamedomar@gmail.com> - 2016-12-12 13:39 -0800
                Re: i need help figuring out what is wrong in my code Karim omar <karimyousrymohamedomar@gmail.com> - 2016-12-12 14:17 -0800
                Re: i need help figuring out what is wrong in my code Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-12-12 18:08 -0500
      Re: i need help figuring out what is wrong in my code Karim omar <karimyousrymohamedomar@gmail.com> - 2016-12-12 09:09 -0800
  Re: i need help figuring out what is wrong in my code lewbloch@gmail.com - 2016-12-13 12:38 -0800
    Re: i need help figuring out what is wrong in my code Eric Douglas <e.d.programmer@gmail.com> - 2016-12-13 12:49 -0800
      Re: i need help figuring out what is wrong in my code lewbloch@gmail.com - 2016-12-14 17:01 -0800
        Re: i need help figuring out what is wrong in my code Martin Gregorie <martin@address-in-sig.invalid> - 2016-12-15 10:47 +0000
  Re: i need help figuring out what is wrong in my code Roedy Green <inquiry@mindprod.com> - 2016-12-13 16:07 -0800

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