Write a public Java class called Student that represents one student. The class

Question

Write a public Java class called Student that represents one student. The class should include:

? Instance variables ID (int), firstName (String), and GPA (double).

? A constructor with no parameters that sets the instance variables, respectively, to these values: -111 (not set) -2.22

? A constructor with three parameters that sets the instance variables to the parameter values.

? Getter methods for each instance variable.

? Setter methods for each instance variable.

? equals and toString methods.

Explanation / Answer

class Student {
   private int ID;
   private String firstName;
   private double GPA;
  
   public Student() {
   this.ID=-111;
   this.GPA=-2.22;
   this.firstName="not set";
   }
  
  
   public Student(int ID,String firstName,double GPA) {
       this.GPA=GPA;
       this.ID=ID;
       this.firstName=firstName;
   }
   public int getID() {
       return ID;
   }
   public void setID(int iD) {
       ID = iD;
   }
   public String getFirstName() {
       return firstName;
   }
   public void setFirstName(String firstName) {
       this.firstName = firstName;
   }
   public double getGPA() {
       return GPA;
   }
   public void setGPA(double gPA) {
       GPA = gPA;
   }
  
   @Override
   public String toString() {
       return this.firstName+" having ID "+this.ID+" has scored "+this.GPA+" GPA";
   }
  
   @Override
   public boolean equals(Object obj) {
       if (obj == this) {
                return true;
            }
       if (!(obj instanceof Student)) {
                return false;
            }
       Student student=(Student)obj;
      return this.ID==student.getID()&&this.firstName.equals(student.getFirstName())&&Double.compare(this.GPA, student.getGPA())==0;
   }
}

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