Question

java

create java class "nameperson"
the example of output would be this:
//if the user inputs
sophia 206999109 2
//then the output shows this
My name is None and my studentid is 0
My name is sophia and studentid is 0
My name is sophia and studentid is 206999109
My grade is 2

so i have to create two classes  
class nameperson{
}

class studentid extends person{

}
class grade extends studentid{
}

my main method is this
class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
       Person[] people = new Person[3];
       int studentid, grade;
String name;

       name = sc.next();
       studentid = sc.nextInt();
       grade = sc.nextInt();
       people[0] = new Person();
       people[1] = new Person(name);
       people[2] = new Person(name, studentid);
       people[3] = new grade(grade);
       for (int i = 0; i < people.length; i++)
           people[i].writeOutput();
      
       sc.close();
}
}

Answer 1

Dear Student ,

As per the requirement submitted above , kindly find the below solution.

Here a new java class file with name "main.java" is created, which contains following code.

main.java :

import java.util.*;
public class Main//Main class
{
//main method
   public static void main(String[] args) {
   Scanner sc = new Scanner(System.in);//creating object of Scanner class
nameperson[] people = new nameperson[4];//array of nameperson
int studentid, grade;//declaring variables
String name;
name = sc.next();//reading name
studentid = sc.nextInt();//reading student id
grade = sc.nextInt();//reading grade
people[0] = new nameperson();//creating object of nameperson
people[1] = new nameperson(name);//creating object of nameperson
people[2] = new nameperson(name, studentid);//creating object of nameperson
people[3] = new Grade(grade);//creating object of grade
//for loop is used to loop through the array
for (int i = 0; i < people.length; i++)
people[i].writeOutput();//calling method
  
sc.close();
   }
}
class nameperson{//class
public String name; //declaring properties
public int studentid;
public nameperson()//default constructor
{
this.name="none";
this.studentid=0;
}
public nameperson(String n)//parameterized constructor
{
this.name=n;
}
public nameperson(String n,int id)//parameterized constructor
{
this.name=n;
this.studentid=id;
}
public void writeOutput()//method to display result
{
System.out.println("My name is "+name+" and studentid is "+studentid);
}
}
class Grade extends nameperson{ //class Grade
public int grade;
public Grade(int g)//parameterized constructor
{
this.grade=g;
}
public void writeOutput()//method to display result
{
System.out.println("My grade is "+grade);
}
}

======================================================

Output : Compile and Run above program to get the screen as shown below

Screen 1 :main.java

NOTE : PLEASE FEEL FREE TO PROVIDE FEEDBACK ABOUT THE SOLUTION.