Question

The class name is StudentTest and the filename is StudentTest.java. The program must do the following (all in main):

1. The program must create three Student objects using the Student constructor. Use literal data for the arguments to the constructor for the first two Students, and variables for the third Student. Prompt for and input the first name, last name and GPA for the third Student object.
2. The program must display the name and GPA for each Student. Use printf and the get methods to access the data. Be sure to label the output.
3. You must format the GPA with two places past the decimal point using the format String %.2f
4. The program must prompt for a new GPA for the first Student. Update the GPA by calling the setGPA method. You should test with valid and invalid input. Display the first Student’s name and GPA after the update.
5. Compare the GPAs of all three students to determine and display the highest GPA. Use the getGPA method to retrieve each GPA.
6. Here is a sample program run:

Answer 1

Note: Could you plz go through this code and let me know if u need any changes in this.Thank You
_________________

// Student.java

public class Student {
   //Declaring instance variables
   private String firstname;
   private String lastname;
   private double gpa;

   //Parameterized constructor
   public Student(String firstname, String lastname, double gpa) {
       this.firstname = firstname;
       this.lastname = lastname;
       this.gpa = gpa;
   }

   // getters and setters
   public String getFirstname() {
       return firstname;
   }

   public void setFirstname(String firstname) {
       this.firstname = firstname;
   }

   public String getLastname() {
       return lastname;
   }

   public void setLastname(String lastname) {
       this.lastname = lastname;
   }

   public double getGpa() {
       return gpa;
   }

   public void setGpa(double gpa) {
       this.gpa = gpa;
   }

}
_______________________

// StudentTest.java
import java.util.Scanner;

public class StudentTest {

   public static void main(String[] args) {
       String fname,lname;
       double gpa,maxGPA;
       /*
       * Creating an Scanner class object which is used to get the inputs
       * entered by the user
       */
       Scanner sc = new Scanner(System.in);
  
Student student1=new Student("Kane","Williams",3.4);
Student student2=new Student("Sachin","Tendulkar",3.6);
  
        //Getting the input entered by the user
System.out.print("Enter student#3 first name :");
fname=sc.next();
System.out.print("Enter student#3 last name :");
lname=sc.next();
System.out.print("Enter student#3 GPA :");
gpa=sc.nextDouble();
  
Student student3=new Student(fname,lname,gpa);
System.out.println("First Name\tLast Name\tGPA");
System.out.println("---------\t--------\t---");
  
System.out.printf("%10s\t%10s\t%.2f\n",student1.getFirstname(),student1.getLastname(),student1.getGpa());
System.out.printf("%10s\t%10s\t%.2f\n",student2.getFirstname(),student2.getLastname(),student2.getGpa());
System.out.printf("%10s\t%10s\t%.2f\n",student3.getFirstname(),student3.getLastname(),student3.getGpa());
  
while(true)
{
   System.out.print("Enter Student#1 GPA :");
   gpa=sc.nextDouble();
   if(gpa<0)
   {
       System.out.println("** Invalid.GPA Must be positive **");
   }
   else
   {
       student1.setGpa(gpa);
       break;
   }
  
}
  
  
System.out.printf("Student#1 Name :%s %s\n",student1.getFirstname(),student1.getLastname());
System.out.printf("Student#1 GPA : %.2f\n",student1.getGpa());
if(student1.getGpa()>student2.getGpa() && student1.getGpa()>student3.getGpa())
{
   maxGPA=student1.getGpa();
}
else if(student2.getGpa()>student3.getGpa())
{
   maxGPA=student2.getGpa();
}
else
{
   maxGPA=student3.getGpa();
}
  
System.out.printf("Highest GPA : %.2f\n",maxGPA);

   }

}
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Output:

Enter student#3 first name :Ricky
Enter student#3 last name :Pointing
Enter student#3 GPA :3.2
First Name   Last Name   GPA
---------   --------   ---
Kane   Williams   3.40
Sachin   Tendulkar   3.60
Ricky   Pointing   3.20
Enter Student#1 GPA :4.0
Student#1 Name :Kane Williams
Student#1 GPA : 4.00
Highest GPA : 4.00

_______________Could you plz rate me well.Thank You