troubleshooting Question

Ignores my first if statement in while but processes it next time through

Avatar of jwhmack
jwhmack asked on
Java
9 Comments1 Solution253 ViewsLast Modified:
Hi, in this program I need to have it setup so that if an incorrect student number is put in then it will give the message ""Your search failed to return any results" and then it will prompt again for the student number.  The second time I enter a number that doesn't return a result I get the message.  Another odd thing I just tried is that if I enter text instead of number I trigger the exception for number format and get the message "Please enter a proper Student Number" but if if I enter a number that doesn't return a result and get just a blank and then a prompt to enter another student number, I try to enter text and then I receive the message "Your search failed to return any results" and then if I enter text I want it to throw the exception.  Can anyone tell me what I am doing wrong here?  Thanks.

import java.io.*;
import java.util.*;

public class TestProgram
{
	public static void main(String args[])
	     {
	String[][] students;

	        try
	        {
			  BufferedReader in = new BufferedReader(new FileReader("students.txt"));
			  int x=0, y=0, row = 0;
			  row = Integer.parseInt(in.readLine());
			  String line;
			  students = new String[row][6];

			  while ((line = in.readLine()) != null)
			  {
			    String[] values = line.split("[\\s]+");
	            y=0;

	            for (String str : values)
		        {
	              students[x][y]=str;
	              y++;
		        }
	              x++;
			  }

	          in.close();

	         String stuNo;
	         Scanner s2 = new Scanner(System.in);
	         System.out.println("Enter Student Number for search (Enter 0 to quit): ");
	         stuNo = s2.next();



			 while ( Integer.parseInt(stuNo) != 0)
			 {
			  String result = "";
	          int rw = students.length;

	           for (int i=0; i<students.length; i++) {
	              for (int j=0; j<4; j++) {
	                 if (stuNo.equals(students[i][j])) {
	                      rw = i;
	                      //break;
	                 }
	             }
	          }
	           if (rw == students.length) {
	             result += "Your search failed to return any results";
	             System.out.println("\n" + "Enter Student Number for search (Enter 0 to quit): ");
	         	 stuNo = s2.next();
	          }
	          else {
	             for (int j=0; j<6; j++) {
	                 result += students[rw][j] + "    ";
	             }
	          }
	           System.out.println("\n" + result+" ");
	           System.out.println("\n" + "Enter Student Number for search (Enter 0 to quit): ");
	           stuNo = s2.next();
		      }
		     }

			  catch(NumberFormatException nfEx)
			  {
			  	System.out.println("Please enter a proper Student Number.");
			  }

	        catch( IOException ioException )
	        {
	          System.out.println("Problem reading students.txt");
	        }
	     }

}
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