The Classes, Before an Interface Is Implemented

Our example will use four classes: Person , Student , Instructor , and Course . The class Person will provide the first and last name attributes (data members ) and will serve as the base class for Student and Instructor . The Course class will not be derived from anything, and for the sake of simplicity will contain nothing but the course name.

The Java classes are defined as follows :

 /////// Person.java 
 package Registration; 
 public class Person { 
 protected String FirstName, LastName; 
 public void Modify( String First, String Last ) 
 { 
 FirstName = First; 
 LastName = Last; 
 } 
 public void Display() 
 { 
 System.out.print( FirstName + " " + LastName); 
 } 
 } 
 /////// Student.java 
 package Registration; 
 public class Student extends Person { 
 protected int GraduationYear; 
 public Student() { 
 GraduationYear = 0; 
 } 
 public void Modify( String First, String Last, int Graduation ) { 
 super.Modify( First, Last ); 
 GraduationYear = Graduation; 
 } 
 public void Display() { 
 super.Display(); 
 System.out.print( " " + GraduationYear ); 
 } 
 } /////// Instructor.java 
 package Registration; 
 public class Instructor extends Person { 
 protected boolean IsTenured; 
 public Instructor() { 
 IsTenured = false; 
 } 
 public void Modify( String First, String Last, boolean Tenured ) { 
 super.Modify( First, Last ); 
 IsTenured = Tenured; 
 } 
 public void Display() { 
 super.Display(); 
 if( IsTenured ) 
 System.out.print( " (Tenured)" ); 
 else 
 System.out.print( " (Not tenured)" ); 
 } 
 } /////// Course.java 
 package Registration; 
 public class Course { 
 protected String Name; 
 public Course() { 
 } 
 public void Modify( String CourseName ) { 
 Name = CourseName; 
 } 
 public void Display() { 
 System.out.print( Name ); 
 } 
 } 

The matching classes in C# would be declared as follows:

 /////// Person.cs 
 using System; 
 namespace Registration 
 { 
 public class Person { 
 protected string FirstStr, LastStr; 
 public void Modify( String First, String Last ) { 
 FirstStr = First; 
 LastStr = Last; 
 } 
 public void Display() { 
 System.Console.Out.Write( FirstStr + " " + LastStr ); 
 } 
 } 
 } 
 
 /////// Student.cs 
 using System; 
 namespace Registration 
 { 
 public class Student : Person 
 { 
 protected int GraduationYear; 
 public Student() { 
 GraduationYear = 0; 
 } 
 public void Modify( String First, String Last, int Graduation ) 
 { 
 base.Modify( First, Last ); 
 GraduationYear = Graduation; 
 } 
 public void Display() { 
 base.Display(); 
 System.Console.Out.Write( " " + GraduationYear  ); 
 } 
 } 
 } 
 
 /////// Instructor.cs 
 using System; 
 namespace Registration 
 { 
 public class Instructor: Person 
 { 
 protected bool TenuredBool; 
 public Instructor() { 
 TenuredBool = false; 
 } 
 public void Modify( String First, String Last, bool Tenured ) 
 { 
 base.Modify( First, Last ); 
 TenuredBool = Tenured; 
 } 
 public void Display() { 
 base.Display(); 
 if( TenuredBool ) 
 System.Console.Out.Write( " (Tenured)" ); 
 else 
 System.Console.Out.Write( " (Not tenured)" ); 
 } 
 } 
 } /////// Course.cs 
 using System; 
 namespace Registration 
 { 
 public class Course 
 { 
 protected string NameStr; 
 public void Modify( String Name  ) { 
 NameStr = Name; 
 } 
 public void Display() { 
 System.Console.Out.Write( NameStr ); 
 } 
 } 
 }