javaSuperSub, Java

Language: Layout:

//'main' method must be in a class 'Rextester'.
//openjdk version '11.0.5'

////////////////////////////////////////////////////////////////////////////////javaSupSub:Super Class,Sub Class and Polymorphism in Java
//this code is  created by Rezaul Hoque on September 22,2022;
//contact:jewelmrh@yahoo.com;Dhaka,Bangladesh;https://rezaulhoque.wordpress.com,https://hoquestake.blogspot.com
//note: codes shared by Rezaul Hoque on rextester are not for sale; they are created and shared to facilitate the algorithm learning process; many like Hoque use this platform to practice programming ;Rezaul hopes his contribution helps others to fine tune their learning;
//////////////////////////////////////////////////////////////////////////////
import java.util.*;
import java.lang.*;

class Demo{
 protected String name;
protected int id;
protected int phone;

public Demo(){
}
public Demo(String n,int a,int c){
this.name=n;
this.id=a;
this.phone=c;

}
public String getN(){return name;}
public int getID(){return id;}
public int getP(){return phone;}
public void category(){System.out.println("None");}
}
class Sub1 extends Demo{
public Sub1(){
super();
}

public Sub1(String n,int a,int c){
super.name=n;
super.id=a;
super.phone=c;
}
@Override
public void category(){System.out.println("Professional");}
}

class Sub2 extends Demo{
public Sub2(){
super();
}

public Sub2(String n,int a,int c){
super(n,a,c);
}
@Override
public void category(){System.out.println("Personal");}
}

class Rextester
{  
    public static void main(String args[])
    {

Demo e1,e2,e3;
                    e1=   new Sub1("XYZ",89,12345);
                     e2=  new Sub2("FGH",90,54321);
                      e3=  new Sub2("QWE",21,45678);
                        
Demo[] demos={e1,e2,e3};
  System.out.println("ID\tName\tPhone\tCategory");
for(Demo ex: demos){
System.out.printf("%d\t%s\t%d\t",ex.getID(),ex.getN(),ex.getP());
ex.category();
}

}
}

[ + ] Show input
Compilation time: 1.13 sec, absolute running time: 0.27 sec, cpu time: 0.18 sec, memory peak: 36 Mb, absolute service time: 1,46 sec