Java Factory Pattern | HackerRank Programming Solutions | HackerRank Java Solutions

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Link for the Problem – Java Factory Pattern – Hacker Rank Solution

Java Factory Pattern – Hacker Rank Solution

According to Wikipedia, a factory is simply an object that returns another object from some other method call, which is assumed to be “new”.

In this problem, you are given an interface Food. There are two classes Pizza and Cake which implement the Food interface, and they both contain a method getType().

The main function in the Main class creates an instance of the FoodFactory class. The FoodFactory class contains a method getFood(String) that returns a new instance of Pizza or Cake according to its parameter.

You are given the partially completed code in the editor. Please complete the FoodFactory class.

Sample Input 1

cake

Sample Output 1

The factory returned class Cake
Someone ordered a Dessert!

Sample Input 2

pizza

Sample Output 2

The factory returned class Pizza
Someone ordered Fast Food!

Java Factory Pattern – Hacker Rank Solution

import java.security.Permission;
import java.util.Scanner;

interface Food {
	public String getType();
}

class Pizza implements Food {
	public String getType() {
		return "Someone ordered a Fast Food!";
	}
}

class Cake implements Food {

	public String getType() {
		return "Someone ordered a Dessert!";
	}
}

class FoodFactory {
	public Food getFood(String order) {
		if ("pizza".equals(order)) {
			return new Pizza();
		} else if ("cake".equals(order)) {
			return new Cake();
		}
		return null;
	}// End of getFood method

}// End of factory class

public class Solution {

	public static void main(String args[]) {
		Do_Not_Terminate.forbidExit();

		try {

			@SuppressWarnings("resource")
			Scanner sc = new Scanner(System.in);
			// creating the factory
			FoodFactory foodFactory = new FoodFactory();

			// factory instantiates an object
			Food food = foodFactory.getFood(sc.nextLine());

			System.out.println("The factory returned " + food.getClass());
			System.out.println(food.getType());
		} catch (Do_Not_Terminate.ExitTrappedException e) {
			System.out.println("Unsuccessful Termination!!");
		}
	}

}

class Do_Not_Terminate {

	public static class ExitTrappedException extends SecurityException {

		private static final long serialVersionUID = 1L;
	}

	public static void forbidExit() {
		final SecurityManager securityManager = new SecurityManager() {
			@Override
			public void checkPermission(Permission permission) {
				if (permission.getName().contains("exitVM")) {
					throw new ExitTrappedException();
				}
			}
		};
		System.setSecurityManager(securityManager);
	}
}