display book or publication of given author

Declare a class called book having author_name as private data member. Extend book class to have two sub classes called book_publication & paper_publication.

Each of these classes have private member called title. Write a complete program to show usage of dynamic method dispatch (dynamic polymorphism) to display book or paper publications of given author. Use command line arguments for inputting data.


import java.util.Scanner;

class book
{
private String[] author_name = {"jaimin","naitik"};

void display()
{
for(int i=0;i<author_name.length;i++)
{
System.out.println("Author names --> \t"+author_name[i]);
}
}
}

class book_publication extends book
{
private String[][] title = {{"java","c lang","oopc"},{"os","micro processor 8085","microprocessor 8086"}};

void display(int j)
{
System.out.println("Books name of given author are....");
System.out.println("------------------------------------------------");
for(int i=0;i<3;i++)
{
System.out.println(title[j][i]);
}
}
}

class paper_publication extends book
{
private String[][] title ={{"Atul","Easy paper Solution"},{"Gala paper Solution","alpha paper Solution"}};

void display(int j)
{
System.out.println("paper publication name of given author are....");
System.out.println("------------------------------------------------");

for(int i=0;i<2;i++)
{
System.out.println(title[j][i]);
}
}
}

class publication
{
public static void main(String [] args)
{
Scanner jaimin = new Scanner(System.in);
book o=new book();
book_publication b_o=new book_publication();
paper_publication p_o=new paper_publication();


int length=args.length;
int author=0,choice;
if(length==0)
{
System.out.println("please enter author name");
}

if(length>=2)
{
System.out.println("Add only one name to search names");
}

if(args[0].equals("jaimin"))
{
author=0;
}
else if(args[0].equals("naitik"))
{
author=1;
}
else
{
System.out.println("You have added wrong name of author");
System.exit(-1);
}


System.out.println("press \"1\" to display book author names\npress \"2\" to display book title names\npress \"3\" to display paper publication names ");
choice=jaimin.nextInt();

switch(choice)
{
case 1:
o.display();
break;

case 2:
b_o.display(author);
break;

case 3:
p_o.display(author);
break;

default:
System.out.println("wrong choice....");
System.exit(-2);
break;

}

}
}

output