Array help please

[buzzdsm]

I have an assignment that I'm stumped on. I created a class and got it to work for one student but I can't figure it out with multiple students. I've included what I currently have. Here is what they are asking for.


Write a class that uses a string array to hold the 5 students names, an array of 5 characters to hold the 5 students letter grades, and 5 arrays of four doubles each to hold each students test scores.

Code:

import java.util.Scanner;

public class GradeBook {
    //declare variables
    private String names;
    private int scores1;
    private int scores2;
    private int scores3;
    private int scores4;
    private double average;
    private char grades;
   
	 Scanner keyboard = new Scanner(System.in);    

    //default constructor
    public GradeBook()
    {
        //initialize variables
        names = "";
        scores1 = 0; // Test Score 1
        scores2 = 0; // Test Score 2
        scores3 = 0; // Test Score 3
        scores4 = 0; // Test Score 4
        average = 0; // total of 4 test scores
		  grades = 'A';         
    }
    
    //overloaded constructor
   public GradeBook (String inName, int scr1, int scr2, int scr3, int scr4, int scr5,
                      int sAverage, char sLetterGrade)
       {    
           names = inName;
           scores1 = scr1;
           scores2 = scr2;
           scores3 = scr3;
           scores4 = scr4;
           average = sAverage;
           grades = sLetterGrade;           
       }
       
       public String toString()
       {
           return "Name: " +names+ "\t" + "Average score: " +average+ "\t" + "Grade: " + grades;    
       }
       
       public void display()
       {
           Scanner keyboard = new Scanner(System.in);
           System.out.println(toString());
       }
         
       //names setter
       public void setnames(String student)
       {
           names = student;    
       }
       
       // scores1 setter
       public void setscores1(int S1)
       {
           scores1 = S1;               
       }
       
       //scores2 setter
       public void setscores2(int S2)
       {
           scores2 = S2;    
       }
       
       //scores3 setter
       public void setscores3(int S3)
       {
           scores3 = S3;    
       }
       
       //scores4 setter
       public void setscores4(int S4)
       {
           scores4 = S4;    
       }
      
           
       //average setter
       public void setaverage(int scores1, int scores2, int scores3, int scores4)
       {
           average = scores1 + scores2 + scores3 + scores4;    
       }
       
       //grades setter
       public void setgrades(char gradesScore)
       {
           grades = gradesScore;    
       }
       
       //names getter
       public String getnames()
       {
           return names;
       }
          
       // scores1 getter
       public int getscores1()
       {
           return scores1;    
       }
       
       //scores2 getter
       public int getscores2()
       {
           return scores2;    
       }
       
       //scores3 getter
       public int getscores3()
       {
           return scores3;    
       }
       
       //scores4 getter
       public int getscores4()
       {
           return scores4;    
       }
                
       //average getter
       public double getaverage()
       {
           return average;    
       }
       
       //grades getter
       public char getgrades()
       {
           return grades;    
       }
       
          
       public void startProcessing()
       {
                        
           String student = "";                  
           System.out.println("Enter student 1's name:");
           student = keyboard.next();
           setnames(student);
			  System.out.println("Now enter student 1's four test scores");
           System.out.println(""); 
           
           System.out.println("");
           
              
           System.out.println("");
                          
           scores1=retrieveScore("Test Score #1", 100);
           scores2=retrieveScore("Test Score #2", 100);
           scores3=retrieveScore("Test Score #3", 100);              
           scores4=retrieveScore("Test Score #4", 100);
          
			  
			  average=grades();
                               
           System.out.println("");
                  
                     
       }
       
       public int retrieveScore(String sVal, int maxVal)
       {
           int x;
           System.out.println(sVal + ":");
           x = keyboard.nextInt();
           if ((x>=0)&&(x<=maxVal))
           {
               System.out.println(" ");
           }
           else
           {//If not valid test score
               System.out.println("Invalid test score");
               System.exit(0);    
           }
           return x;
       }
       
       public double grades()
           {             
               int sumTest;
               double percentTest;
                                             
                                          
               sumTest = scores1+ scores2+ scores3+ scores4;
               percentTest = ((sumTest)/4.0);
               average = percentTest;
                              
        if(average>=90)
            grades='A';
        else if(average >=80)
            grades='B';
        else if(average>=70)
            grades='C';
        else if(average>=60)
            grades='D';
        else if(average<60)
            grades='F';
            
        return average;    
        }

Code:

public class gradeDemo {

   public static void main(String[] arg)
   {
//     GradeBook gradingTest = new GradeBook();
//       gradingTest.display();  
           
    GradeBook gradingTest = new GradeBook();
    gradingTest.startProcessing();
    
    
    System.out.println(gradingTest.toString());
            
   }
    
    
}

[hardwired]

Code:

public class GradeBook
{
    //declare variables
    // a string array to hold the 5 students names
    private String[] names = new String[5];
    // an array of 5 characters to hold the 5 students letter grades
    private char[] grades = new char[5];
    // 5 arrays of four doubles each to hold each students test scores
    private double[] scores1 = new double[4];
    private double[] scores2 = new double[4];
    private double[] scores3 = new double[4];
    private double[] scores4 = new double[4];
    private double[] scores5 = new double[4];

[buzzdsm]

Thanks a ton hardwired.

Is there something I need to take out of my class for this to work?

[hardwired]

I would start over and build your class so that it does what you want it to do (according to your assignment).
For example:

Code:

import java.util.Scanner;

public class GradeBookRx
{
    //declare variables
    // a string array to hold the 5 students names
    private String[] names = new String[5];
    // an array of 5 characters to hold the 5 students letter grades
    private char[] grades = new char[5];
    // 5 arrays of four doubles each to hold each students test scores
    private double[] scores1 = new double[4];
    private double[] scores2 = new double[4];
    private double[] scores3 = new double[4];
    private double[] scores4 = new double[4];
    private double[] scores5 = new double[4];
    int count = 0;
   
    Scanner keyboard = new Scanner(System.in);    
             
    public void enterData()
    {                  
        System.out.println("Enter student's name:");
        String student = keyboard.nextLine();
        System.out.println("Now enter student's first test score");
        double score1 = Double.parseDouble(keyboard.nextLine());
        System.out.println("Now enter student's second test score");
        double score2 = Double.parseDouble(keyboard.nextLine());
        System.out.println("Now enter student's third test score");
        double score3 = Double.parseDouble(keyboard.nextLine());
        System.out.println("Now enter student's fourth test score");
        double score4 = Double.parseDouble(keyboard.nextLine());
        addStudent(student, score1, score2, score3, score4);
    }
       
    public String toString()
    {
        StringBuilder sb = new StringBuilder();
        for(int i = 0; i < names.length; i++) {
            if(names[i] == null)
                continue;
            sb.append("Name: " + names[i] + "\t" +
                      "Average score: " + getAverage(i) +
                      "\t" + "Grade: " + grades[i] + "\n");
        }
        return sb.toString();
    }

    private void addStudent(String inName, double scr1,
                            double scr2, double scr3, double scr4)
    {
        // If arrays are full, start over at beginning.
        if(count == names.length-1)
            count = 0;
        names[count] = inName;
        scores1[count] = scr1;
        scores2[count] = scr2;
        scores3[count] = scr3;
        scores4[count] = scr4;
        grades[count] = getGrade(count);
        count++;
    }
      
    private double getAverage(int index)
    {
        double score1 = scores1[index];
        double score2 = scores2[index];
        double score3 = scores3[index];
        double score4 = scores4[index];
        double average = (score1 + score2 + score3 + score4)/4.0;
        return average;
    }
       
    private char getGrade(int index)
    {             
        double average = getAverage(index);
        char grade;
                              
        if(average>=90)
            grade='A';
        else if(average >=80)
            grade='B';
        else if(average>=70)
            grade='C';
        else if(average>=60)
            grade='D';
        else   // average<60
            grade='F';

        return grade;    
    }

    public static void main(String[] argsd)
    {
        GradeBookRx test = new GradeBookRx();
        test.enterData();
        System.out.println("gradebook = " + test);
    }
}