First and last data item is not being read. (JAVA)

Question

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

public class FileProcessing
{
  public static void main(String[] args) throws IOException
  {
    FileReader inFile = null;
    PrintWriter outFile = null;
    PrintWriter outFile2 = null;
    Scanner inToken = null;

    String stuID = null;
    String lastName = null;
    String firstName = null;
    int quiz1 = 0, quiz2 = 0, quiz3 = 0;
    int finalExam = 0;
    int hw1 = 0, hw2 = 0, hw3 = 0, hw4 = 0, hw5 = 0;
    int hw6 = 0, hw7 = 0, hw8 = 0, hw9 = 0, hw10 = 0, hw11 = 0;
    String major = null;
    double gpa = 0;

    double differential = 0;
    double grade = 0;
    int min = 0;

    int count = 0;
    int countA = 0;
    int countB = 0;
    int countC = 0;
    int countD = 0;
    int countE = 0;

    inFile = new FileReader("Students.csv"); 
    outFile = new PrintWriter(new FileWriter("CourseReport.txt")); 
    outFile2 = new PrintWriter(new FileWriter("MajorReport.txt"));

    try
    {
      inToken = new Scanner(new BufferedReader(inFile));
      inToken.useDelimiter(",");

      System.out.println ("---OUTPUT FILE BEING PRODUCED---\n");

      if (inToken.hasNext())
      {

       // Creates headings for the output file.
       outFile.println ("\t\t***COURSE  AVERAGE  REPORT***");
       outFile.println ("");
       outFile.println ("");
       outFile.println ("NAME\t\t\t\tCOURSE AVERAGE\t");
       outFile.println ("");
       //--------------------------------------------------------------
       outFile2.println ("\t\t\t***C.I.T. MAJOR REPORT***");
       outFile2.println ("");
       outFile2.println ("");
       outFile2.println ("NAME\t\t\t\tFINAL SCORE\t\tDIFFERENTIAL\t");
       outFile2.println ("");

      }

      while (inToken.hasNext())
      {
         // Reads the input file.
         stuID = inToken.next();
         lastName = inToken.next();
         firstName = inToken.next();
         quiz1 = inToken.nextInt();
         quiz2 = inToken.nextInt();
         quiz3 = inToken.nextInt();
         finalExam = inToken.nextInt();
         hw1 = inToken.nextInt();
         hw2 = inToken.nextInt();
         hw3 = inToken.nextInt();
         hw4 = inToken.nextInt();
         hw5 = inToken.nextInt();
         hw6 = inToken.nextInt();
         hw7 = inToken.nextInt();
         hw8 = inToken.nextInt();
         hw9 = inToken.nextInt();
         hw10 = inToken.nextInt();
         hw11 = inToken.nextInt();
         major = inToken.next();
         gpa = inToken.nextDouble();


         //loop to find min homework score.
           min = hw1;
         if(hw2 < hw1)
           min = hw2;
         if(hw3 < hw2)
           min = hw3;
         if(hw4 < hw3)
           min = hw4;
         if(hw5 < hw4)
           min = hw5;
         if(hw6 < hw5)
           min = hw6;
         if(hw7 < hw6)
           min = hw7;
         if(hw8 < hw7)
           min = hw8;
         if(hw9 < hw8)
           min = hw9;
         if(hw10 < hw9)
           min = hw10;
         if(hw11 < hw10)
           min = hw11;


         // Calculating grades & differential
         grade = ((quiz1+quiz2+quiz3) * .45) + (finalExam * .3) + 
                 (((hw1 + hw2 + hw3 + hw4 + hw5 + hw6 + hw7 + hw8 + hw9 + hw10 + hw11 - min) / 10) * .25);

         differential = grade - finalExam;

         if(grade < 60)
           countE++;
         else if (grade < 70)
           countD++;
          else if (grade < 80)
           countC++;
          else if (grade < 90)
           countB++;
          else countA++;


         //Output data.
         outFile.println (firstName + lastName + "\t\t" + grade); count++;
         //----------------------------------------------------------------------------
         if(major=="CIT"){
         outFile2.println (firstName + lastName + "\t\t" + finalExam + "\t\t" + differential); count++;
         }

      }
    }

         finally
          {
               System.out.println ("\n---PROCESSING COMPLETED---\n\n");

               if (inToken != null)
               {  if (count > 0)
                  {

      //report totals-------------------------------------------------------------------------------
                    outFile.println ("");
                    outFile.println ("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
                    outFile.println ("Number of Students that have an A: \t" + countA);
                    outFile.println ("Number of Students that have an B: \t" + countB);
                    outFile.println ("Number of Students that have an C: \t" + countC);
                    outFile.println ("Number of Students that have an D: \t" + countD);
                    outFile.println ("Number of Students that have an E: \t" + countE);
                    outFile.println ("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
      //-------------------------------------------------------------------------------------------
                    outFile2.println ("");
                    outFile2.println ("~~~END~~~");

                  }

                   else
                   {
                      outFile.println ("");
                      outFile.println ("Input file was empty...no data processed");
                      outFile.close();
      //--------------------------------------------------------------------------------------------
                      outFile2.println ("");
                      outFile2.println ("Input file was empty...no data processed");
                      outFile2.close();
                   }
                    inToken.close();
                 }

               if (outFile != null)
               { outFile.close(); }

               if (outFile2 != null)
               { outFile2.close(); }
          }
   }

}

Input file text:

1036,Trick,Larry,66,89,91,57,12,16,10,13,20,20,20,11,13,13,18,BUS,2.4
1037,Hernandez,Lisa,78,93,57,52,7,10,5,16,13,5,6,18,9,11,18,BIO,3.7
1038,Isaacs,James,91,85,51,68,6,13,16,19,16,6,10,13,9,6,15,IMD,4.0
1039,Malta,Allison,68,60,93,72,12,12,11,12,10,11,7,16,9,8,9,BIO,2.6
1040,Ray,Leah,58,52,74,71,10,19,6,14,8,13,17,5,7,7,10,BIO,2.4
1041,Mink,Bruce,90,78,63,85,12,7,14,15,11,5,9,5,7,14,18,BUS,2.8
1042,Minke,Magdalen,100,91,61,73,17,18,15,15,19,18,18,15,15,20,16,BUS,2.9
1043,Walker,Carol,89,61,65,64,19,16,15,19,15,17,20,16,17,19,18,BUS,2.0
1044,Young,Christopher,87,85,52,94,15,20,15,18,20,15,18,16,20,18,19,BIO,3.6
1045,Summers,Charles,86,65,95,92,17,15,16,15,19,19,19,17,19,15,17,BIO,3.9
1046,Sumner,Sheila,90,71,61,100,15,16,19,16,19,20,15,16,15,19,20,BUS,3.8
1047,Turner,Marlena,92,91,83,73,20,20,18,19,17,20,17,17,17,15,18,BUS,2.9
1048,Janes,Scotty,92,61,56,81,20,20,18,16,17,19,17,16,18,17,19,IMD,3.9
1049,Maddox,Paul,93,96,81,63,18,18,20,16,17,16,20,18,20,15,18,BUS,3.1
1050,Peal,Ashley,66,97,61,52,18,18,20,17,19,18,19,15,20,15,18,BUS,3.0
1051,Peel,Sean,69,76,58,66,15,20,15,17,17,19,17,15,18,19,18,BUS,3.9
1052,Robertson,Brittany,88,95,75,50,19,18,17,20,17,16,15,16,18,18,20,BUS,4.0
1053,Votaw,Katie,80,64,86,56,18,19,19,20,20,15,18,17,18,17,16,BUS,2.2
1054,Watson,Luis,37,76,68,90,20,15,18,15,20,20,15,15,20,15,17,BIO,2.5
1055,Walker,Russell,44,82,54,53,18,19,16,18,15,15,15,17,15,16,19,BIO,2.4
1056,Walker,Stephanie,97,85,97,89,17,19,20,19,15,19,16,15,18,15,16,BIO,2.1
1057,Evans,Thomas,78,63,80,56,20,19,20,17,20,15,20,18,17,19,15,BUS,3.8
1058,Graves,Janssen,91,90,65,61,16,15,20,16,20,16,20,18,18,20,16,BUS,2.3
1059,Garrett,Edward,68,93,85,64,17,19,18,15,15,18,16,20,17,17,20,IMD,2.9
1060,Hicks,Shannon,58,62,86,92,15,17,18,20,15,19,15,18,18,18,18,BUS,3.4
1061,Back,William,90,66,80,53,20,17,19,20,20,19,20,18,18,17,16,BUS,2.5
1062,Brown,Barbara,100,81,61,58,16,19,15,16,18,15,15,20,17,20,15,BUS,3.6
1063,Black,Natasha,89,87,60,58,19,18,17,16,17,15,15,16,19,19,19,BIO,2.4
1064,Franklin,Louis,87,64,82,74,18,16,17,17,20,16,18,17,17,20,16,BUS,2.3
1065,Lake,Amy,86,55,52,94,15,18,18,17,17,19,18,17,18,19,20,BUS,2.2
1066,Lawson,Travis,90,55,77,95,17,18,20,20,16,19,18,20,17,16,16,IMD,2.3
1067,Johnson,David,92,54,57,96,15,17,20,18,17,16,16,16,16,16,18,BUS,2.9
1068,Jones,Vivian,92,73,82,98,20,15,17,19,16,19,15,19,15,19,16,IMD,2.6
1069,Johnson,Joshua,93,76,77,83,16,17,18,18,17,20,15,16,16,20,20,IMD,2.5
1070,Martin,Ashley,66,64,95,89,19,17,18,19,15,17,15,17,15,17,18,BUS,2.9
1071,Marks,Farrah,89,77,54,65,16,20,16,16,16,15,17,18,15,16,20,BUS,4.0
1072,Boggs,Ronnie,90,55,73,99,16,18,20,19,15,17,15,20,18,20,15,BIO,3.9
1073,Biggers,Kara,100,69,92,59,15,15,16,16,18,17,20,17,20,20,17,BUS,3.4
1074,Nunn,John,0,68,82,63,15,15,19,15,17,20,17,19,16,15,19,BUS,2.8
1075,Wilson,Diana,45,58,50,100,20,20,20,16,20,16,17,19,19,17,16,BIO,2.0
1076,Bastin,Molly,55,64,91,81,16,16,16,16,19,16,19,16,16,19,17,BUS,2.2
1077,Booger,Kayla,88,54,74,99,20,17,15,17,18,19,15,16,18,16,18,BUS,2.3
1078,Shay,Susan,89,50,78,80,16,20,19,15,18,20,19,16,20,18,15,BUS,3.1
1079,Shea,Lakesha,82,88,77,79,20,15,19,18,20,19,17,19,19,15,20,BUS,2.7
1080,Ward,Brian,47,83,51,89,19,17,17,16,20,16,18,19,18,15,15,BUS,2.1
1081,Smith,Karen,3,60,99,56,15,17,18,17,15,20,18,20,19,18,15,BUS,3.1
1082,Adams,Jeri,90,52,79,81,15,19,17,19,16,19,17,17,18,18,15,IMD,2.2
1083,Bengals,Lisabeth,10,73,64,73,20,15,15,17,19,20,16,16,16,19,20,BUS,2.9
1084,Scott,John,100,55,77,79,15,18,16,16,16,20,17,19,17,19,17,IMD,3.2
1085,Ball,Margaret,85,79,95,88,16,18,20,16,17,19,19,15,15,19,17,BIO,2.0
1086,Gaston,Stephen,77,89,86,74,20,16,19,18,19,20,20,18,17,20,17,BUS,2.4
1087,Newland,Santy,44,82,75,51,15,19,19,19,17,17,18,17,19,17,15,BUS,2.5
1088,Manning,Stacy,99,51,86,58,17,20,17,16,18,15,20,16,20,15,16,BUS,3.2
1089,McIntosh,Frances,60,51,61,99,20,18,18,15,18,18,15,15,19,16,16,BIO,2.5
1090,Jones,Melynn,90,62,71,93,18,18,16,15,16,15,16,18,20,16,15,BUS,2.3
1091,Kelley,Kamla,90,81,57,81,20,15,18,16,17,19,16,19,17,18,16,BUS,2.6
1092,Manning,Amy,89,92,57,97,19,18,19,18,20,20,20,16,15,17,15,BUS,3.4
1093,Ramsey,Kristen,54,96,62,61,15,15,19,15,19,16,15,15,18,18,15,IMD,2.0

Warning when compiled:

2 warnings found: File: C:\Users\x\Documents\SCHOOLWORK\CIT 249 JAVA II\File >Processing\FileProcessing.java [line: 21] Warning: The local variable stuID is never read File: C:\Users\x\Documents\SCHOOLWORK\CIT 249 JAVA II\File >Processing\FileProcessing.java [line: 29] Warning: The local variable gpa is never read

Error when ran:

java.util.InputMismatchException at java.util.Scanner.throwFor(Unknown Source) at java.util.Scanner.next(Unknown Source) at java.util.Scanner.nextDouble(Unknown Source) at FileProcessing.main(FileProcessing.java:93) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at >edu.rice.cs.drjava.model.compiler.JavacCompiler.runCommand(JavacCompiler.java:272)

score 1 · Accepted Answer · edited May 23 '17 at 10:31

The first problem I see is you're not calling nextLine() after each nextInt() and after nextDouble(). The reason it's important to do this is because nextXXX() does not consume the newline character. So the next time you grab a token, you're grabbing the newline character. This is the reason you're getting an input mismatch after getting the token for major. gpa never gets read because your program never really gets that far. Scanner's behavior is that when it's fed a bad token, it skips over it.

Don't use hasNext(). Use hasNextLine() instead to avoid skipping a token and not consuming the newline character. See this StackOverflow question for more detail: Getting User input with Scanner. Read the accepted answer. It'll explain why you're skipping your first token.

It may be helpful for you to take a look at the API for Scanner: http://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html. I recommend reading at least until the "Localized Numbers" section, though the entire thing is a good to read.

First and last data item is not being read. (JAVA)

1 Answers1