Question

Problem 01: GradeConverter

• design a GradeConverter class. This class does not have any attributes.
• a static method double letterGradeToNumericGrade(String letterGrade) to convert a letterGrade to a numeric 4.0 scale grade.
• a static method String numericGradeToLetterGrade(double numericGrade) to convert a numeric 4.0 scale grade to a letterGrade.
• The following table can be used to do the conversion. Note: only 4.0 scale is considered for this project.

Problem 02: Course

• this class has courseName, credits, letterGrade, and numericGrade as its attributes.
• a constructor that requires a name, credits, and letterGrade as the arguments. Note: in this constructor, the numericGrade should be initialized using the proper GradeConverter method.
• a constructor that requires a name, credits, and numericGrade as the arguments. Note: in this constructor, the letterGrade should be initialized using the proper GradeConverter method.
• getters and setters for the attributes.

Answer 1

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Code

//GradeConverter class
public class GradeConverter
{
   //static method to convert from letterGrade to NumericGrade
   public static double letterGradeToNumericGrade(String letterGrade)
   {
       switch(letterGrade)
       {
           case "A+": case "A": return 4.0;
           case "A-": return 3.7;
           case "B+": return 3.3;
           case "B": return 3.0;
           case "B-": return 2.7;
           case "C+": return 2.3;
           case "C": return 2.0;
           case "C-": return 1.7;
           case "D+": return 1.3;
           case "D": return 1.0;
       }
       return 0.0;          
   }
   //static method to conver from numericGrade to LetterGrade
   public static String numericGradeToLetterGrade(double numericGrade)
   {
       if(numericGrade == 4.0) return "A+";
       if(numericGrade == 3.7) return "A-";
       if(numericGrade == 3.3) return "B+";
       if(numericGrade == 3.0) return "B";
       if(numericGrade == 2.7) return "B-";
       if(numericGrade == 2.3) return "C+";
       if(numericGrade == 2.0) return "C";
       if(numericGrade == 1.7) return "C-";
       if(numericGrade == 1.3) return "D+";
       if(numericGrade == 1.0) return "D";
       return "F";
   }
}

//Course class
class Course
{
   //attributes
   private String courseName;
   private double credits;
   private String letterGrade;
   private double numericGrade;
  
   //constructor
   public Course(String courseName, double credits, String letterGrade)
   {
       this.courseName = courseName;
       this.credits = credits;
       this.letterGrade = letterGrade;
       numericGrade = GradeConverter.letterGradeToNumericGrade(letterGrade);
   }
   //another constructor
   public Course(String courseName, double credits, double numericGrade)
   {
       this.courseName = courseName;
       this.credits = credits;
       this.numericGrade = numericGrade;
       letterGrade = GradeConverter.numericGradeToLetterGrade(numericGrade);
   }
  
   //getter methods
   public String getCcourseName() { return courseName;}
   public double getCredits(){ return credits; }
   public String getLetterGrade(){ return letterGrade;}
   public double getNumericGrade(){ return numericGrade;}
  
   //setter methods
   public void setCcourseName(String courseName) { this.courseName = courseName;}
   public void setCredits(double credits){ this.credits = credits; }
   public void setLetterGrade(String letterGrade){ this.letterGrade = letterGrade;}
   public void setNumericGrade(double numericGrade){ this.numericGrade = numericGrade;}
  
}