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split() method

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split() method
genuinek
14 Oct, 2008 - 09:00 PM
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Lets say I am using the split method to split a string into an array. Is their a way to split the string after the third comma in the string. And if so, could I parse that entire array into a double.

here's the example file I am working with:

LastName, FirstName, Exam1, Asg1, Asg2, Exam2, Asg3, Asg4
Christopher, Thomas, 78, 79, 82, 88, 78, 91
Cole, John, 100, 100, 100, 100, 100, 100
Karr, Arlen, 91, 86, 94, 100, 98, 93
McClurg, Andrew, 91, 87, 99, 87,,93
Noble, Rich, 84, 79, 85, 88, 90, 91
Rao, Sista, 91, 86, 94, 100, 98, 93
Stotz, Ralph, 81,83,,93, 78
Yi, Yu, 99, 88, 101, 76, 90, 94
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pbl
RE: Split() Method
14 Oct, 2008 - 09:04 PM
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Is Stotz, Ralph an error or you might have two ,, that follow each other without number between them ?

Can we see your code ?
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genuinek
RE: Split() Method
14 Oct, 2008 - 09:15 PM
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Here is what im working with its gonna end up being a GUI grading system.

CODE
import java.io.*;
import java.util.*;
import javax.swing.*;

public class BaggettAsg3 extends JFrame
{
    public double Midterm;
    public double Final;
    public double assignment1, assignment2, assignment3, assignment4;

    public static double setRecords(String filename) throws IOException
    {
        File file = new File(filename);
        Scanner inputFile = new Scanner(file);

    double[] Mid = new double[7];
    double[] Final = new double[7];
    double[] Asg1 = new double[7];
    double[] Asg2 = new double[7];
    double[] Asg3 = new double[7];
    double[] Asg4 = new double[7];
              
            inputFile.nextLine();
            String Student1 = inputFile.nextLine();
            String[] S1 = Student1.split("\\,");
            String Student2 = inputFile.nextLine();
            String[] S2 = Student2.split("\\,");
            String Student3 = inputFile.nextLine();
            String[] S3 = Student3.split("\\,");        
            String Student4 = inputFile.nextLine();
            String[] S4 = Student4.split("\\,");        
            String Student5 = inputFile.nextLine();
            String[] S5 = Student5.split("\\,");
            String Student6 = inputFile.nextLine();
            String[] S6 = Student6.split("\\,");
            String Student7 = inputFile.nextLine();
            String[] S7 = Student7.split("\\,");    
            String Student8 = inputFile.nextLine();
            String[] S8 = Student8.split("\\,");
                  
            inputFile.close();
                      
            
    }
    
public static void main(String [] args)
{
     String filename;
     filename = "Asg3Data.txt";
}
          
    
}


Right now I am splitting it after each comma. However, I want to split it after the second* comma, so I can parse the grades in the file to doubles.
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genuinek
RE: Split() Method
14 Oct, 2008 - 09:31 PM
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any help would be appreciated.
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g00se
RE: Split() Method
15 Oct, 2008 - 12:44 AM
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This is how i'd do it. The methods I hint at here you would obviously have to write yourself:

CODE

        String[] nameInfo = marks.split("(?<=\\D),");
        Student s = new Student();
        s.setFirstname(nameInfo[1].trim());
        s.setLastname(nameInfo[0].trim());
        s.setMarks(getArrayAsNumbers(nameInfo[2].trim()));
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genuinek
RE: Split() Method
15 Oct, 2008 - 04:01 PM
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thanks for the help but waht exactly does (?<=\\D) mean.
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pbl
RE: Split() Method
15 Oct, 2008 - 05:30 PM
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QUOTE(genuinek @ 15 Oct, 2008 - 05:01 PM) *

thanks for the help but waht exactly does (?<=\\D) mean.

You were splitting on "\" and ","
He splits on "?", "<", "=", "\" and "D"

I would rather use a Scanner for that type of thing
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genuinek
RE: Split() Method
15 Oct, 2008 - 06:23 PM
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but why all those im only wanting to split after each comma. Im just stumped on how to parse the numbers into doubles.
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pbl
RE: Split() Method
15 Oct, 2008 - 06:30 PM
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So just

String[] S1 = Student1.split(",");
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genuinek
RE: Split() Method
15 Oct, 2008 - 06:55 PM
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thx. now the numbers I want to parse would start at S1[2] etc.. right? How would I do that?
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pbl
RE: Split() Method
15 Oct, 2008 - 08:04 PM
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QUOTE(genuinek @ 15 Oct, 2008 - 07:55 PM) *

thx. now the numbers I want to parse would start at S1[2] etc.. right? How would I do that?

int number = Integer.parseInt(s[2]);
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genuinek
RE: Split() Method
19 Oct, 2008 - 10:44 PM
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Well after making adjustments this is what I got. However, I want to know if I am going in the right direction and if not what I can do to fix it.
CODE
import java.io.*;
import java.util.*;
import javax.swing.*;

public class Asg3
{
  
    public static  class studentRecords extends JFrame
    {
        public double Assignment1, Assignment2, Assignment3, Assignment4;
        public double Midterm;
        public double Final;
        public double numericGrade;
        public char letterGrade;
        public int choice;
        public double[] Asg = new double[31];
        public double[] Mid = new double[7];
        public double[] Fin = new double[7];
        
        public void Record() throws IOException
        {
            File grades = new File("Asg3Data.txt");
            Scanner inputFile = new Scanner(grades);
            
            inputFile.nextLine();
            String Student1 = inputFile.nextLine();
            String[] S1 = Student1.split(",");
            String Student2 = inputFile.nextLine();
            String[] S2 = Student2.split(",");
            String Student3 = inputFile.nextLine();
            String[] S3 = Student3.split(",");        
            String Student4 = inputFile.nextLine();
            String[] S4 = Student4.split(",");        
            String Student5 = inputFile.nextLine();
            String[] S5 = Student5.split(",");
            String Student6 = inputFile.nextLine();
            String[] S6 = Student6.split(",");
            String Student7 = inputFile.nextLine();
            String[] S7 = Student7.split(",");    
            String Student8 = inputFile.nextLine();
            String[] S8 = Student8.split(",");
            Asg[0] = Double.parseDouble(S1[3]);
            Asg[1] = Double.parseDouble(S1[4]);
            Asg[2] = Double.parseDouble(S1[6]);
            Asg[3] = Double.parseDouble(S1[7]);
            Asg[4] = Double.parseDouble(S2[3]);
            Asg[5] = Double.parseDouble(S2[4]);
            Asg[6] = Double.parseDouble(S2[6]);
            Asg[7] = Double.parseDouble(S2[7]);
            Asg[8] = Double.parseDouble(S3[3]);
            Asg[9] = Double.parseDouble(S3[4]);
            Asg[10] = Double.parseDouble(S3[6]);
            Asg[11] = Double.parseDouble(S3[7]);
            Asg[12] = Double.parseDouble(S4[3]);
            Asg[13] = Double.parseDouble(S4[4]);
            Asg[14] = Double.parseDouble(S4[6]);
            Asg[15] = Double.parseDouble(S4[7]);
            Asg[16] = Double.parseDouble(S5[3]);
            Asg[17] = Double.parseDouble(S5[4]);
            Asg[18] = Double.parseDouble(S5[6]);
            Asg[19] = Double.parseDouble(S5[7]);
            Asg[20] = Double.parseDouble(S6[3]);
            Asg[21] = Double.parseDouble(S6[4]);
            Asg[22] = Double.parseDouble(S6[6]);
            Asg[23] = Double.parseDouble(S6[7]);
            Asg[24] = Double.parseDouble(S7[3]);
            Asg[25] = Double.parseDouble(S7[4]);
            Asg[26] = Double.parseDouble(S7[6]);
            Asg[27] = Double.parseDouble(S7[7]);
            Asg[28] = Double.parseDouble(S8[3]);
            Asg[29] = Double.parseDouble(S8[4]);
            Asg[30] = Double.parseDouble(S8[6]);
            Asg[31] = Double.parseDouble(S8[7]);
            Mid[0] = Double.parseDouble(S1[2]);
            Mid[1] = Double.parseDouble(S2[2]);
            Mid[2] = Double.parseDouble(S3[2]);
            Mid[3] = Double.parseDouble(S4[2]);
            Mid[4] = Double.parseDouble(S5[2]);
            Mid[5] = Double.parseDouble(S6[2]);
            Mid[6] = Double.parseDouble(S7[2]);
            Mid[7] = Double.parseDouble(S8[2]);
            Fin[0] = Double.parseDouble(S1[5]);
            Fin[1] = Double.parseDouble(S2[5]);
            Fin[2] = Double.parseDouble(S3[5]);
            Fin[3] = Double.parseDouble(S4[5]);
            Fin[4] = Double.parseDouble(S5[5]);
            Fin[5] = Double.parseDouble(S6[5]);
            Fin[6] = Double.parseDouble(S7[5]);
            Fin[7] = Double.parseDouble(S8[5]);
              
            
        }
        
        public void  setMidterm()
        {
         if (choice == 1)
         {
             Midterm = Mid[0] * .25;
            
         }
         if (choice == 2)
         {
             Midterm = Mid[1] * .25;
            
         }
         if (choice == 3)
         {
             Midterm = Mid[2] * .25;
            
         }
         if (choice == 4)
         {
             Midterm = Mid[3] * .25;
            
         }
         if (choice == 5)
         {
             Midterm = Mid[4] * .25;
            
         }
         if (choice == 6)
         {
             Midterm = Mid[5] * .25;
            
         }
         if (choice == 7)
         {
             Midterm = Mid[6] * .25;
            
         }
         if (choice == 8)
         {
             Midterm = Mid[7] * .25;
            
         }
            
        }
        
        public void setFinal()
        {
         if (choice == 1)
         {
             Final = Fin[0] * .50;
            
         }
         if (choice == 2)
         {
             Final = Fin[1] * .50;
            
         }
         if (choice == 3)
         {
             Final = Fin[2] * .50;
            
         }
         if (choice == 4)
         {
             Final = Fin[3] * .50;
            
         }
         if (choice == 5)
         {
             Final = Fin[4] * .50;
            
         }
         if (choice == 6)
         {
             Final = Fin[5] * .50;
            
         }
         if (choice == 7)
         {
             Final = Fin[6] * .50;
            
         }
         if (choice == 8)
         {
             Final = Fin[7] * .50;
            
         }
            
        }
        
        public void setAssignments()
        {
         if (choice == 1)
         {
             Assignment1 = Asg[0] * .25;
             Assignment2 = Asg[1] * .25;
             Assignment3 = Asg[2] * .25;
             Assignment4 = Asg[3] * .25;
         }
         if (choice == 2)
         {
             Assignment1 = Asg[4] * .25;
             Assignment2 = Asg[5] * .25;
             Assignment3 = Asg[6] * .25;
             Assignment4 = Asg[7] * .25;
         }
         if (choice == 3)
         {
             Assignment1 = Asg[8] * .25;
             Assignment2 = Asg[9] * .25;
             Assignment3 = Asg[10] * .25;
             Assignment4 = Asg[11] * .25;
         }
         if (choice == 4)
         {
             Assignment1 = Asg[12] * .25;
             Assignment2 = Asg[13] * .25;
             Assignment3 = Asg[14] * .25;
             Assignment4 = Asg[15] * .25;
         }
         if (choice == 5)
         {
             Assignment1 = Asg[16] * .25;
             Assignment2 = Asg[17] * .25;
             Assignment3 = Asg[18] * .25;
             Assignment4 = Asg[19] * .25;
         }
         if (choice == 6)
         {
             Assignment1 = Asg[20] * .25;
             Assignment2 = Asg[21] * .25;
             Assignment3 = Asg[22] * .25;
             Assignment4 = Asg[23] * .25;
         }
         if (choice == 7)
         {
             Assignment1 = Asg[24] * .25;
             Assignment2 = Asg[25] * .25;
             Assignment3 = Asg[26] * .25;
             Assignment4 = Asg[27] * .25;
         }
         if (choice == 8)
         {
             Assignment1 = Asg[28] * .25;
             Assignment2 = Asg[29] * .25;
             Assignment3 = Asg[30] * .25;
             Assignment4 = Asg[31] * .25;
         }
        
        }
        
        public double getMidterm()
        {
            return Midterm;
        }
        public double getFinal()
        {
            return Final;
        }
        public double getAssignments1()
        {
            return Assignment1;            
        }
        public double getAssignments2()
        {
            return Assignment2;
        }
        public double getAssignments3()
        {
            return Assignment3;
        }
        public double getAssignments4()
        {
            return Assignment4;
        }
        
        void getAverage()
        {
            numericGrade = Midterm + Final + ((Assignment1 + Assignment2
                    + Assignment3 +Assignment4)/4);
            
        }
        
        void getLetterGrade()
        {
            if (numericGrade >= 90)
                letterGrade = 'A';
            
            if (numericGrade >= 80 && numericGrade < 90)
                letterGrade = 'B';
            
            if (numericGrade >= 70 && numericGrade < 80)
                letterGrade = 'C';
            
            if (numericGrade >= 60 && numericGrade < 70)
                letterGrade = 'D';
            
            if (numericGrade < 60)
                letterGrade = 'F';
        }
    }
    
public static void main(String [] args)
{
    
    
}
          
    
}


This post has been edited by genuinek: 19 Oct, 2008 - 10:45 PM
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