Question

Write a class encapsulating the concept of a student, assuming a student has the following attributes: a name, a Social Security number, and a GPA (for instance, 3.5). Include a constructor, the accessors and mutators, and methods toString and equals. Write a client class (test driver with main method) to test all the methods in your class (create 2 student objects, print the name, social security number and GPA of the 2 students, check if the two student’s GPA is the same or equal, change the name of the first student).

Answer 1

class Student
{
   private String name;
   private String SSN;
   private double GPA;
  
   //constructors
   public Student(String name,String SSN,double GPA)
   {
       this.name = name;
       this.SSN = SSN;
       this.GPA = GPA;
   }
   public Student()
   {
       name = " ";
       GPA = 0.0;
       SSN = " ";
   }
  
  
   //accessors and mutators
   public void setName(String name)
   {
       this.name = name;
   }
   public String getName()
   {
       return name;
   }
   public void setSSN(String SSN)
   {
       this.SSN = SSN;
   }
   public String getSSN()
   {
       return SSN;
   }
   public void setGPA(double GPA)
   {
       this.GPA = GPA;
   }
   public double getGPA()
   {
       return GPA;
   }
  
   public boolean equals(Student s)
   {
       if(this.name == s.name && this.SSN == s.SSN && this.GPA == s.GPA)
       return true;
       else
       return false;
   }
   public String toString()
   {
       return "Student Name : "+name+" SSN : "+SSN +" GPA : "+GPA;
   }
}

class TestStudent
{
   public static void main (String[] args)
   {
       Student s1 = new Student("James Hawkings","668798809",3.77);
      
       System.out.println(s1);
      
       Student s2 = new Student();
       s2.setName("Camy Lara");
       s2.setSSN("768708099");
       s2.setGPA(4.5);
       System.out.println(s2);
      
       System.out.println(s1.equals(s2));
   }
}

Output:

Student Name : James Hawkings  SSN : 668798809  GPA : 3.77
Student Name : Camy Lara  SSN : 768708099  GPA : 4.5
false

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