Question

// Client application class and service class Create a NetBeans project named StudentClient following the instructions provided in the Starting a NetBeans Project instructions in the Programming Exercises/Projects Menu on Blackboard. Add a class named Student to the StudentClient project following the instructions provided in the Starting a NetBeans Project instructions in the Programming Exercises/Projects Menu on Blackboard. After you have created your NetBeans Project your application class StudentC lient should contain the following executable code: package studentclient; public class StudentClient { public static void main(String[] args) { } } Your service class should contain the following executable code: package studentclient; publi c class Student { } In the StudentClient application class main method code the instructions to perform the tasks indicated in the remarks : package studentclient; public class StudentClient{ public static void main( String [] args ){ /* Declare two object references of type Student s1 and s2 and instantiate two Student objects passing three arguments to the constructor for the class . Use different values for each class object */ // Your code here /* Output the name, social security number and GPA of the student from object reference s1 using the appropriate accessor methods to obtain the data */ // Your code here /* Output the name, social security number and GPA of the student from object reference s2 using the toString method to return the data */ // Your code here /* Using the equals method and a selection control structure (if statement), compare objects s1 and s2 and output an appropriate message indicating if the objects are equal */ // Your code here /* U sing the appropriate mutator methods on student object s2, change the name, social security number and GPA to the same values as in object s1. Use the set methods. */ // Your code here /* Again, using the equals method and a selection control structure (if statement), compare objects s1 and s2 and output an appropriate message indicating if the objects are equal */ // Your code here } } In the Student service class code the instructions to define your Student service class struc ture with the appropriate constructors, mutator methods, accessor methods as well as a toString and an equals method : package studentclient; public class Student { /* Declare three instance variables to represent the student name, social security num ber and GPA */ // Your code here /* Overloaded constructor method : Allows client to set beginning values for name, ssn, and gpa . This constructor takes three parameters and c alls mutator methods to validate new values */ public Student ( String newName, String newSsn, double newGpa ) { // Your code here } /* getName accessor method */ public String getName( ) { // Your code here } /* setName mutator method */ public void setName( String newName ) { // Your code here } /* getSsn accessor method */ public String getSsn( ) { // Your code here } / * setSSN mutator method */ public void setSsn( String newSsn ) { // Your code here } /* getGpa accessor method */ public double getGpa( ) { // Your code here } /* setGpa mutator method: Allows client to set value of gpa and p rints an error message if new value is either less than 0 or greater than 4.0 . setGpa does not change the valu e of gpa if newGpa is negative or greater than 4. 0 */ public void setGpa( double newGpa ) { // Your code here } /* toString method returns student name, social security number and GPA */ public String toString( ) { // Your code here } /* equals method returns boolean Compares two Student objects for the same field values return s a boolean, true if this object has the same field value as the parameter object */ public boolean equals( Object o ) { // Your code here } } When your application has been successfully compiled and executed , Zip the StudentClient project folder. After the StudentClient project folder has been successfully compressed, upload the zipped folder to your Blackboard ac count for Programming Exercise 3 .

Answer 1

package studentclient;

import java.util.Scanner;

public class StudentClient {

public static void main(String[] args) {

String n;
String Sn;
double g;
System.out.println("Enter Student 1 details");
System.out.println("Name:");
Scanner sc=new Scanner(System.in);
n=sc.next();
System.out.println("Social Security number");
Sn=sc.next();
System.out.println("GPA");
g=sc.nextDouble();
Student s1=new Student(n,Sn,g);
System.out.println("Enter Student 2 details");
System.out.println("Name:");
n=sc.next();
System.out.println("Social Security number");
Sn=sc.next();
System.out.println("GPA");
g=sc.nextDouble();
Student s2=new Student(n,Sn,g);
/* Output the name, social security number and GPA of the student from object reference s1
using the appropriate accessor methods to obtain the data */

// Your code here
System.out.println("Student 1 details");
System.out.println("name:"+s1.getName());
System.out.println("Social Security Number:"+s1.getSsn());
System.out.println("GPA:"+s1.getGpa());
/* Output the name, social security number and GPA of the student from object reference s2
using the toString method to return the data */

// Your code here
System.out.println("Student 2 details");
System.out.println("name:"+s2.getName());
System.out.println("Social Security Number:"+s2.getSsn());
System.out.println("GPA:"+s2.getGpa());

  
/* Using the equals method and a selection control structure (if statement), compare objects
s1 and s2 and output an appropriate message indicating if the objects are equal */

// Your code here
if(s1.equals(s2))
System.out.println("Student details are Equal");
else
System.out.println("Student details are not Equal");

/* Using the appropriate mutator methods on student object s2, change the name, social security
number and GPA to the same values as in object s1. Use the set methods. */
// Your code here
System.out.println("Enter new details for Student 2");
System.out.println("Name:");
n=sc.next();
s2.setName(n);
System.out.println("Social Security number");
Sn=sc.next();
s2.setSsn(Sn);
System.out.println("GPA");
g=sc.nextDouble();
  
s2.setGpa(g);
  
/* Again, using the equals method and a selection control structure (if statement),
compare objects s1 and s2 and output an appropriate message indicating if the objects are equal */

// Your code here
if(s1.equals(s2))
System.out.println("Student details are Equal");
else
System.out.println("Student details are not Equal");
}
}

class Student
{
String name;
String social_security_number;
double GPA;
public Student( String newName, String newSsn, double newGpa )
{
this.name=newName;
this.social_security_number=newSsn;
this.GPA=newGpa;
}
public String getName( )
{
return this.name;

}
/* setName mutator method */
public void setName( String newName )
{
// Your code here
this.name=newName;
}
/* getSsn accessor method */

public String getSsn( )
{
// Your code here
return this.social_security_number;
}

/* setSSN mutator method */
public void setSsn( String newSsn )
{
// Your code here
this.social_security_number=newSsn;
}

/* getGpa accessor method */

public double getGpa( )
{
// Your code here
return this.GPA;
}

/* setGpa mutator method: Allows client to set value of gpa and prints an error message
if new value is either less than 0 or greater than 4.0. setGpa does not change the value
of gpa if newGpa is negative or greater than 4.0 */

public void setGpa( double newGpa )
{
// Your code here
if(newGpa<0 || newGpa>4)
System.out.println("Error! Gpa value should be in the range(0 to 4 ) only.");
else
this.GPA=newGpa;
}

/* toString method returns student name, social security number and GPA */
@Override
public String toString( )
{   
// Your code here
return ("name:"+this.name+" Social Security number:"+this.social_security_number+ " GPA:"+this.GPA);   
}

/* equals method returns boolean
Compares two Student objects for the same field values returns a boolean, true if this object has
the same field value as the parameter object */
public boolean equals( Student S )
{
// Your code here
boolean ans=false;
if(this.name.equals(S.name) && this.social_security_number.equals(S.social_security_number)
&&this.GPA==S.GPA)
{
ans=true;
}
return ans;
}

}

//Output:

run:
Enter Student 1 details
Name:
Bala
Social Security number
1234
GPA
2.3
Enter Student 2 details
Name:
David
Social Security number
3456
GPA
2.3
Student 1 details
name:Bala
Social Security Number:1234
GPA:2.3
Student 2 details
name:David
Social Security Number:3456
GPA:2.3
Student details are not Equal
Enter new details for Student 2
Name:
Bala
Social Security number
1234
GPA
5
Error! Gpa value should be in the range(0 to 4 ) only.
Student details are Equal