Data Structure

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META-INF/MANIFEST.MF

Manifest-Version: 1.0

students/Course.class

                package students;

                public 
                synchronized 
                class Course {
    
                private String 
                courseId;
    
                private double 
                credits;
    
                private String 
                grade;
    
                public void Course();
    
                public String 
                getCourseId();
    
                public void 
                setCourseId(String);
    
                public double 
                getCredits();
    
                public void 
                setCredits(double);
    
                public String 
                getGrade();
    
                public void 
                setGrade(String);
    
                public String 
                toString();
    
                public int 
                hashCode();
    
                public boolean 
                equals(Object);
}

students/Course.java

students/Course.java

package  students ;
import  java . util . Objects ;

public   class   Course   {
    
     private   String  courseId ;
     private   double  credits ;
     private   String  grade ;
     public   String  getCourseId ()   {
         return  courseId ;
     }
     public   void  setCourseId ( String  courseId )   {
         this . courseId  =  courseId ;
     }
     public   double  getCredits ()   {
         return  credits ;
     }
     public   void  setCredits ( double  credits )   {
         this . credits  =  credits ;
     }
     public   String  getGrade ()   {
         return  grade ;
     }
     public   void  setGrade ( String  grade )   {
         this . grade  =  grade ;
     }
    @ Override
     public   String  toString ()   {
         return   "Course{"   +   "courseId="   +  courseId  +   ", credits="   +  credits  +   ", grade="   +  grade  +   '}' ;
     }

    @ Override
     public   int  hashCode ()   {
         int  hash  =   7 ;
        hash  =   59   *  hash  +   Objects . hashCode ( this . courseId );
         return  hash ;
     }

    @ Override
     public   boolean  equals ( Object  obj )   {
         if   ( this   ==  obj )   {
             return   true ;
         }
         if   ( obj  ==   null )   {
             return   false ;
         }
         if   ( getClass ()   !=  obj . getClass ())   {
             return   false ;
         }
         final   Course  other  =   ( Course )  obj ;
         if   ( ! Objects . equals ( this . courseId ,  other . courseId ))   {
             return   false ;
         }
         return   true ;
     }    
}

students/Student.class

                package students;

                public 
                synchronized 
                class Student {
    
                private String 
                firstName;
    
                private String 
                lastName;
    
                private String 
                idNo;
    
                private java.util.ArrayList 
                courses;
    
                private double 
                totalCredits;
    
                private double 
                gpa;
    
                public void Student();
    
                public java.util.ArrayList 
                getCourses();
    
                public void 
                setCourses(java.util.ArrayList);
    
                public String 
                getFirstName();
    
                public void 
                setFirstName(String);
    
                public String 
                getLastName();
    
                public void 
                setLastName(String);
    
                public String 
                getIdNo();
    
                public void 
                setIdNo(String);
    
                public double 
                getTotalCredits();
    
                public void 
                setTotalCredits(double);
    
                public double 
                getGpa();
    
                public void 
                setGpa(double);
    
                public int 
                hashCode();
    
                public boolean 
                equals(Object);
    
                public String 
                toString();
    
                public 
                static String 
                generateRndomId(java.util.Random, String, int);
}

students/Student.java

students/Student.java

package  students ;

import  java . util . ArrayList ;
import  java . util . Objects ;
import  java . util . Random ;


public   class   Student   {
     private   String  firstName ;
     private   String  lastName ;
     private   String  idNo ;
     private   ArrayList < Course >  courses ;
     private   double  totalCredits ;
     private   double  gpa ;

     public   ArrayList < Course >  getCourses ()   {
         return  courses ;
     }

     public   void  setCourses ( ArrayList < Course >  courses )   {
         this . courses  =  courses ;
     }

     public   String  getFirstName ()   {
         return  firstName ;
     }

     public   void  setFirstName ( String  firstName )   {
         this . firstName  =  firstName ;
     }

     public   String  getLastName ()   {
         return  lastName ;
     }

     public   void  setLastName ( String  lastName )   {
         this . lastName  =  lastName ;
     }

     public   String  getIdNo ()   {
         //return idNo;
         return  generateRndomId ( new   Random (),   "0123456789" ,   6 );
     }

     public   void  setIdNo ( String  idNo )   {
         this . idNo  =  generateRndomId ( new   Random (),   "0123456789" ,   6 );
     }

     public   double  getTotalCredits ()   {
         return  totalCredits ;
     }

     public   void  setTotalCredits ( double  totalCredits )   {
         this . totalCredits  =  totalCredits ;
     }

     public   double  getGpa ()   {
         return  gpa ;
     }

     public   void  setGpa ( double  gpa )   {
         this . gpa  =  gpa ;
     }

    @ Override
     public   int  hashCode ()   {
         int  hash  =   7 ;
        hash  =   29   *  hash  +   Objects . hashCode ( this . idNo );
         return  hash ;
     }

    @ Override
     public   boolean  equals ( Object  obj )   {
         if   ( this   ==  obj )   {
             return   true ;
         }
         if   ( obj  ==   null )   {
             return   false ;
         }
         if   ( getClass ()   !=  obj . getClass ())   {
             return   false ;
         }
         final   Student  other  =   ( Student )  obj ;
         if   ( ! Objects . equals ( this . idNo ,  other . idNo ))   {
             return   false ;
         }
         return   true ;
     }

   /*  @Override
    public String toString() {
        return "Student{" + "firstName=" + firstName + ", lastName=" + lastName + ", idNo=" + idNo + ", totalCredits=" + totalCredits + ", gpa=" + gpa + '}';
    }
*/

    @ Override
     public   String  toString ()   {
         return   "Student{"   +   "firstName="   +  firstName  +   ", lastName="   +  lastName  +   ", idNo="   +  idNo  +   ", courses="   +  courses  +   ", totalCredits="   +  totalCredits  +   ", gpa="   +  gpa  +   '}' ;
     }
    
     //generate random id
     public   static   String  generateRndomId ( Random  rng ,   String  characters ,   int  length )
{
     char []  text  =   new   char [ length ];
     for   ( int  i  =   0 ;  i  <  length ;  i ++ )
     {
        text [ i ]   =  characters . charAt ( rng . nextInt ( characters . length ()));
     }
     return   new   String ( text );
}
}

students/Driver.class

                package students;

                public 
                synchronized 
                class Driver {
    
                private 
                static java.util.ArrayList 
                student;
    
                public void Driver();
    
                public 
                static java.util.ArrayList 
                loaddata();
    
                public 
                static Student 
                crunchifyCSVtoArrayList(String);
    
                public 
                static java.util.ArrayList 
                addStudent(String, String, java.util.ArrayList);
    
                public 
                static void 
                display(java.util.ArrayList);
    
                public 
                static void 
                storeData();
    
                public 
                static void 
                main(String[]) 
                throws java.io.IOException;
}

students/Driver.java

students/Driver.java

package  students ;

import  java . io . BufferedReader ;
import  java . io . FileReader ;
import  java . io . FileWriter ;
import  java . io . IOException ;
import  java . util . ArrayList ;

public   class   Driver   {
    
     private   static   ArrayList < Student >  student ;
    
     public   static   ArrayList < Student >  loaddata (){
         BufferedReader  file  =   null ;
         ArrayList < Student >  students  =   new   ArrayList <> ();
         try   {
             String  crunchifyLine ;
            file  =   new   BufferedReader ( new   FileReader ( "students.txt" ));
            
                         boolean  isfirst  =   false ;
             while   (( crunchifyLine  =  file . readLine ())   !=   null )   {
                             if ( isfirst ){
                
                                students . add ( crunchifyCSVtoArrayList ( crunchifyLine ));
                             }
                            isfirst  =   true ;
             }
            
         }   catch   ( IOException  e )   {
            e . printStackTrace ();
         }   finally   {
             try   {
                 if   ( file  !=   null )  file . close ();
             }   catch   ( IOException  crunchifyException )   {
                crunchifyException . printStackTrace ();
             }
         }
                
                 return  students ;
     }
public   static   Student  crunchifyCSVtoArrayList ( String  crunchifyCSV )   {
         ArrayList < String >  crunchifyResult  =   new   ArrayList < String > ();
                 Student  s  =   new   Student ();
                student  =   new   ArrayList <> ();
                 ArrayList < Course >  courses  =   new   ArrayList <> ();
                 Course  c  =   new   Course ();
        
         if   ( crunchifyCSV  !=   null )   {
             String []  splitData  =  crunchifyCSV . split ( "\\s*,\\s*" );
                        
                         int  counter  =   0 ;
                         int  coursesplitor  =   0 ;
             for   ( int  i  =   0 ;  i  <  splitData . length ;  i ++ )   {
                             String  element =   "" ;
                              if   ( ! ( splitData [ i ]   ==   null )   ||   ! ( splitData [ i ]. length ()   ==   0 ))   {
                    element  =  splitData [ i ]. trim ();
                 }
                             if ( counter  <   3 ){
                                
                               crunchifyResult . add ( element );
                                if ( counter  ==   0 ){
                                   s . setLastName ( element );
                                   
                                }
                               
                                if ( counter  ==   1 ){
                                   s . setFirstName ( element );
                                  
                                }
                               
                                if ( counter  ==   2 ){
                                   s . setIdNo ( element );
                                  
                                }
                             }
                            
                             else {
                                
                                  if ( element . equalsIgnoreCase ( "-999" )){
                                     break ;
                                 }
                                
                                 if ( coursesplitor  < 3 ){
                                     if ( coursesplitor  ==   0 ){
                                        c . setCourseId ( element );
                                     }
                                      if ( coursesplitor  ==   1 ){
                                        c . setCredits ( Double . parseDouble ( element ));
                                     }
                                       if ( coursesplitor  ==   2 ){
                                        c . setGrade ( element );
                                        courses . add ( c );
                                        c  =   new   Course ();
                                        coursesplitor  =   - 1 ;
                                       
                                     }
                                 }
                                 else {
                                    coursesplitor  =   0 ;
                                 }
                                
                             }
                           
                             if ( counter >= 3 ){
                            coursesplitor ++ ;
                             }
                            counter ++ ;
             }
         }
                
                s . setCourses ( courses );
                s . setTotalCredits ( utils . calculateCredits ( s ));
                s . setGpa ( utils . calculateGpa ( s ));

                 return  s ;
     }
    
     public   static   ArrayList < Student >  addStudent ( String  lastName , String  firstName ,   ArrayList < Student >  students ){
         Student  student  =   new   Student ();
        student . setFirstName ( firstName );
        student . setLastName ( lastName );
        students . add ( student );
         return  students ;
     }
    
     public   static   void  display ( ArrayList < Student >  students ){
         for ( Student  s :  students ){
             System . out . println ( s );
         }
     }
    
     public   static   void  storeData (){
     }
     public   static   void  main ( String  args [])   throws   IOException {
            
         ArrayList < Student >  students  =  loaddata ();
        display ( students );
        students  =   new   ArrayList <> ();
        
     }
}

students/utils.class

                package students;

                public 
                synchronized 
                class utils {
    
                private 
                static java.util.HashMap 
                gradepoints;
    
                static void 
                <clinit>();
    
                public void utils();
    
                public 
                static void 
                loadGradepoints();
    
                public 
                static double 
                calculateCredits(Student);
    
                public 
                static double 
                calculateGpa(Student);
    
                public 
                static void 
                writeLine(java.io.Writer, java.util.List) 
                throws java.io.IOException;
    
                public 
                static void 
                writeLine(java.io.Writer, java.util.List, char, char) 
                throws java.io.IOException;
    
                private 
                static String 
                followCVSformat(String);
    
                public 
                static void 
                writetoOuputFile(java.util.ArrayList) 
                throws java.io.IOException;
}

students/utils.java

students/utils.java

package  students ;

import  java . io . FileWriter ;
import  java . io . IOException ;
import  java . io . Writer ;
import  java . util . ArrayList ;
import  java . util . HashMap ;
import  java . util . List ;


public   class  utils  {
    
    
     private   static   HashMap < String , String >  gradepoints  =   new   HashMap <> ();
    
     public   static   void  loadGradepoints (){
        gradepoints . put ( "A+" ,   "4" );
        gradepoints . put ( "A" ,   "4" );
        gradepoints . put ( "A-" ,   "3.7" );
        gradepoints . put ( "B+" ,   "3.3" );
        gradepoints . put ( "B" ,   "3" );
        gradepoints . put ( "B-" ,   "2.7" );
        gradepoints . put ( "C+" ,   "2.3" );
        gradepoints . put ( "C" ,   "2" );
        gradepoints . put ( "C-" ,   "1.7" );
        gradepoints . put ( "D+" ,   "1.3" );
        gradepoints . put ( "D" ,   "1.0" );
        gradepoints . put ( "D-" ,   "0.7" );
        gradepoints . put ( "F" ,   "0.0" );
     }
    
  
     public   static   double  calculateCredits ( Student  s ){
         double  creditstotal  =   0.0 ;
         ArrayList < Course >  courses  =  s . getCourses ();
        
        loadGradepoints ();
        
         for ( Course  c  :  courses ){
            creditstotal  +=  c . getCredits ();
         }
        
         return  creditstotal ;
     }
    
     public   static   double  calculateGpa ( Student  s ){
         double  gpa  =   0.0 ;
         double  totalcredits  =  calculateCredits ( s );
         double  totalgradepoints  =   0.0 ;
        
         ArrayList < Course >  courses  =  s . getCourses ();
        
         for ( Course  c  :  courses ){
             String  key  =  c . getGrade ();
             String  value  =  gradepoints . get ( key );
             double  dbValue  =   Double . parseDouble ( value );
            
            totalgradepoints  +=  dbValue  *  c . getCredits ();
            
         }
        
        
        gpa  =  totalgradepoints  /  totalcredits ;
        
         return  gpa ;
     }
    
     public   static   void  writeLine ( Writer  w ,   List < String >  values )   throws   IOException   {
        writeLine ( w ,  values ,   ',' ,   ' ' );
     }
    
     public   static   void  writeLine ( Writer  w ,   List < String >  values ,   char  separators ,   char  customQuote )   throws   IOException   {

         boolean  first  =   true ;

        

         if   ( separators  ==   ' ' )   {
            separators  =   ',' ;
         }

         StringBuilder  sb  =   new   StringBuilder ();
         for   ( String  value  :  values )   {
             if   ( ! first )   {
                sb . append ( separators );
             }
             if   ( customQuote  ==   ' ' )   {
                sb . append ( followCVSformat ( value ));
             }   else   {
                sb . append ( customQuote ). append ( followCVSformat ( value )). append ( customQuote );
             }

            first  =   false ;
         }
        sb . append ( "\r\n" );
        w . append ( sb . toString ());


     }
    
      private   static   String  followCVSformat ( String  value )   {

         String  result  =  value ;
         if   ( result . contains ( "\"" ))   {
            result  =  result . replace ( "\"" ,   "\"\"" );
         }
         return  result ;

     }
     
      public   static   void  writetoOuputFile ( ArrayList < Student >  students )   throws   IOException {
          ArrayList < String >  stringArray  =   new   ArrayList <> ();
          String  csvFile  =   "studentresults.txt" ;
          FileWriter  writer  =   new   FileWriter ( csvFile );
         
         
          for ( Student  s  :  students ){
              String  firstName  =  s . getFirstName ();
              String  lastName  =  s . getLastName ();
              String  idNo  =  s . getIdNo ();
              ArrayList < Course >  courses  =  s . getCourses ();
              double  totalcredits  =  s . getTotalCredits ();
              double  gpa  =  s . getGpa ();
             
             stringArray . add ( firstName );
             stringArray . add ( lastName );
             stringArray . add ( idNo );
              for ( Course  course  :  courses ){
                  String  courseid  =  course . getCourseId ();
                  String  credits  =   Double . toString ( course . getCredits ());
                  String  grade  =  course . getGrade ();
                 
                 stringArray . add ( courseid );
                 stringArray . add ( credits );
                 stringArray . add ( grade );
                 
              }
             stringArray . add ( Double . toString ( totalcredits ));
             stringArray . add ( Double . toString ( gpa ));
             
       
        utils . writeLine ( writer ,  stringArray );
        writer . flush ();
        stringArray  =   new   ArrayList <> ();
        
            
          }
         
         writer . close ();

      }
    
}

students/students.txt

Jones, Mary, 903452, COS 4342, 2.5, A, COS 3311, 4, B+, -999, 0, 0 Martin,Joseph,312345,4598,3,C,1122,3,A-,2467,4,A,-999,0,0