Student class that stores a student name and average. - Java Object Oriented Design

Java examples for Object Oriented Design:Class

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Introduction

Create and test Student objects.

Demo Code


public class Main
{
   public static void main(String[] args)
   {/* w  w  w.j av a  2 s. co  m*/
      Student account1 = new Student("James Bond", 93.5);
      Student account2 = new Student("Michael Bates", 72.75); 

      System.out.printf("%s's letter grade is: %s%n", 
         account1.getName(), account1.getLetterGrade());      
      System.out.printf("%s's letter grade is: %s%n", 
         account2.getName(), account2.getLetterGrade());      
   } 
}
class Student 
{
   private String name; 
   private double average; 

   // constructor initializes instance variables
   public Student(String name, double average)
   {
      this.name = name;

      // validate that average is > 0.0 and <= 100.0; otherwise,
      // keep instance variable average's default value (0.0)
      if (average > 0.0) {
         if (average <= 100.0){
            this.average = average; // assign to instance variable
         }
      }
   }

   // sets the Student's name
   public void setName(String name)
   {
      this.name = name; 
   }

   // retrieves the Student's name
   public String getName()
   {
      return name;
   }

   // sets the Student's average
   public void setAverage(double average)
   {
      // validate that average is > 0.0 and <= 100.0; otherwise,
      // keep instance variable average's current value  
      if (average > 0.0) {
         if (average <= 100.0){
            this.average = average; // assign to instance variable
         }
      }
   }

   // retrieves the Student's average
   public double getAverage()
   {
      return average;
   }

   // determines and returns the Student's letter grade
   public String getLetterGrade()
   {
      String letterGrade = ""; // initialized to empty String

      if (average >= 90.0)
         letterGrade = "A";
      else if (average >= 80.0)
         letterGrade = "B";
      else if (average >= 70.0)
         letterGrade = "C";
      else if (average >= 60.0)
         letterGrade = "D";
      else
         letterGrade = "F";

      return letterGrade;
   }
}

Result


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