Java help

week6_src/gradebook.docx

ASSIGNMENT - GRADEBOOKENTRY

Make GradeBookEntry an abstract class. Remove numericGrade member variable.

Make getNumericGrade an abstract method. Add getData as an abstract method.

Make two subclasses of GradeBookEntry - HomeworkEntry and ExamEntry.

Exam has a curve. getNumericGrade should add the curve to the numericGrade.

HomeworkEntry can just return numericGrade as is.

Add appropriate constructors.

Add appropriate exception handling.

Base code is in the assignment folder inside src.

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__MACOSX/week6_src/._gradebook.docx

week6_src/Person.java

week6_src/Person.java

package  edu . drexel . ct290 ;

import  java . util . Scanner ;

public   class   Person   {

     private   String  name ;
     private   int  age ;
     private   String  email ;
     private   String  ssn ;
    
     // A default constructor.  If no constructors were declared
     // then the JVM would provide a default that did nothing.
     // If another constructor is declared, then you must also
     // declare a default constructor if you want one.  If you do not,
     // you will not be able to instantiate an object without any parameters.
     public   Person (){
        name  =   "" ;
        age  =   0 ;
        email  =   "" ;
        ssn  =   "" ;
     }
     // A simple constructor to initialize the name
     // NOTE: constructors do not have return types and
     // are named after the class name.
     public   Person ( String  name ){
         // Keyword 'this' distinguishes between the member of this class,
         // and the parameter name;
         this . name  =  name ;
        
         // the rest of the member variables will have default values
     }
    
     // This constructor initializes everything
     public   Person (   String  name ,   int  age ,   String  email ,   String  ssn ){
         this . name  =  name ;
         this . age  =  age ;
         this . email  =  email ;
         this . ssn  =  ssn ;
     }
    
     // This is a copy constructor.  It takes an object of the same
     // class, and copies all the member variables over.
     // Then you will have two separate objects with identical data
     public   Person (   Person  person ){
         this . name  =  person . name ;
         this . age  =  person . age ;
         this . email  =  person . email ;
         this . ssn  =  person . ssn ;
     }
    
     public   String  getName ()   {
         return  name ;
     }

     public   void  setName ( String  name )   {
         this . name  =  name ;
     }

     public   int  getAge ()   {
         return  age ;
     }

     public   void  setAge ( int  age )   {
         this . age  =  age ;
     }

     public   String  getEmail ()   {
         return  email ;
     }

     public   void  setEmail ( String  email )   {
         this . email  =  email ;
     }
    
     public   void  getData (){
         Scanner  reader  =   new   Scanner ( System . in );
        
         System . out . print ( "Enter the person's name: " );
        name  =  reader . nextLine ();
        
         System . out . print ( "Enter the person's age: " );
        age  =  reader . nextInt ();
        reader . nextLine ();
        
         System . out . print ( "Enter the person's email: " );
        email  =  reader . nextLine ();
        
         System . out . println ( "Enter SSN: " );
        ssn  =  reader . nextLine ();
     }
    
     public   String  getId (){
         return  ssn ;
     }
    
     public   String  toString (){
         return   "Name: "   +  name  +   "\nAge: "   +  age  +   "\nemail: "   +  email ;
     }
}


__MACOSX/week6_src/._Person.java

week6_src/Rectangle.java

week6_src/Rectangle.java

package  edu . drexel . ct290 ;

public   class   Rectangle   implements   Shape   {

     private   long  width ;
     private   long  height ;
    
     public   long  getWidth ()   {
         return  width ;
     }

     public   void  setWidth ( long  width )   {
         // keyword this distinguishes between the member variable
         // radius of this class, and the method parameter named radius
         this . width  =  width ;
     }

     public   long  getHeight ()   {
         return  height ;
     }

     public   void  setHeight ( long  height )   {
         this . height  =  height ;
     }

    @ Override
     public   double  area ()   {
         return  height * width ;
     }

}


__MACOSX/week6_src/._Rectangle.java

week6_src/Shape.java

week6_src/Shape.java

package  edu . drexel . ct290 ;

public   interface   Shape   {
    public   double  area ();
}


__MACOSX/week6_src/._Shape.java

week6_src/ShapeTest.java

week6_src/ShapeTest.java

package  edu . drexel . ct290 ;

public   class   ShapeTest   {

     public   static   void  main ( String []  args )   {
         // Create an array of shapes.
         // Notice that the interface is used as the type
         Shape []  shapes  =   new   Shape [ 2 ];
        
         Circle  circle  =   new   Circle ();
        circle . setRadius ( 4 );
        
         Rectangle  rec  =   new   Rectangle ();
        rec . setWidth ( 4 );
        rec . setHeight ( 6 );
        
         // Assign the specific shapes to the array
         // Since they implement Shape, they can be used as objects of
         // type Shape in the code.
        shapes [ 0 ]   =  circle ;
        shapes [ 1 ]   =  rec ;
        
         for (   int  i = 0 ;  i < shapes . length ;  i ++   ){
             // Print out the area using only the method defined in Shape
             System . out . println ( "The area is: "   +  shapes [ i ]. area ()   );
         }
     }
}


__MACOSX/week6_src/._ShapeTest.java

week6_src/Student.java

week6_src/Student.java

package  edu . drexel . ct290 ;

import  java . util . Scanner ;

import  edu . drexel . ct290 . Person ;

public   class   Student   extends   Person   {
    
     private   String  studentId ;
     private   String  gradeLevel ;
    
     // A constructor for student:
     public   Student (   String  name ,   String   Id ,   String  gradeLevel ){
         // you can reuse the superclass constructors:
         super ( name );
        
         // then add initialization for Student specific variables:
         this . studentId  =   Id ;
         this . gradeLevel  =  gradeLevel ;
     }
    
    @ Override
     public   String  toString (){
         // Get the person string from the super class:
         String  studentString  =   super . toString ();
        
         // TODO: Add the student specific info:
        studentString  +=   "\nId: "   +  studentId  +   "\nYear: "   +  gradeLevel ;
         return  studentString ;
     }
    
    @ Override
     public   void  getData (){
         super . getData ();
         Scanner  reader  =   new   Scanner ( System . in );
        
         System . out . print ( "Enter student id: " );
        studentId  =  reader . nextLine ();
        
         System . out . print ( "Enter grade level: " );
        gradeLevel  =  reader . nextLine ();
        
     }
}


__MACOSX/week6_src/._Student.java

__MACOSX/._week6_src