Question

1.) According to the UML Class Diagram, these are the mutator and accessor methods that you need to define:

1a.) +setName(value:String):void

1b.) +setGPA(value:double):void

1c.) +setID(value: String):void

1d.) +getName(): String

1e.) +getLastName():String

2.) Working with constructors

2a.) +Student() : This is the default constuctor. For the Strings properties, initialize them to null. The order is String ID, String name, String lastName, and double GPA.

2b.) +Student(value:String) - This constructor receives just the ID.

2c.) +Student(value:String, var: String) - This constructor receives the ID and name in that order.

2d.) +Student(value:String, var: String, change: String) - This constructor receives the ID, name, and last name in that order.

Answer 1

implementation:

/*
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 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package javaapplication23;
import java.util.Random;
import java.util.Scanner;

/**
 *
 * @author haptop laptop
 */
class Student{
    String name;
    String id;
    String lastName;
    double GPA;
    
Student()//2.a solution//default constructor
{
    id=null;
    name=null;
    lastName=null;
    GPA=0.0;
    
    
    
}
Student(String value)//2.b solution//parametrized constructor
{
    id=value;
}
Student(String value,String var)//2.c solution//parametrized constructor
{
    id=value;
    name=var;
    
}
Student(String value,String var,String change)//2.d solution//parametrized constructor
{
    id=value;
    name=var;
    lastName=change;
}
void setName(String value )//sol 1.a//mutator method
{
    name=value;
}
void setGPA(double value)//sol 1.b//mutator method
{
    GPA=value;
}
void setId(String value)//sol 1.c//mutator method
{
    id=value;
}
String getName()//sol 1.d//accessor method 
{
 return name;    
}
String getLastName()//sol 1.e//accessor method 
{
    return lastName;
}
double getGPA()//accessor method 
{    return GPA;
}
}
        



public class JavaApplication23 {

    /**
     * @param args the command line arguments
     */
    
  
    public static void main(String[] args) {
        // TODO code application logic here
       Student s1=new Student();//object
       Student s2=new Student("shreya");//object
       Student s3=new Student("sristy","1234");
       Student s4=new Student("1232","shresth","sharma");
       System.out.println("name of student "+s4.getName()+" last name is "+s4.getLastName());
       s1.setName("john");
       s1.setGPA(4.5);
       System.out.println("name of student "+s1.getName()+" gpa is "+s1.getGPA());
   

// TODO Auto-generated method stub

    }
}

//hope it is cleared i have mentioned details in the comment of program.