Please help me with this using java. And comment the code The following is some code designed by J. Hacker for a video game. There is an Alien class to represent a monster and an AlienPack class that represents a band of aliens and how much damage they can inflict: class Alien { public static final int SNAKE_ALIEN = 0; public static final int OGRE_ALIEN = 1; public static final int MARSHMALLOW_MAN_ALIEN = 2; public int type; // Stores one of the three above types public int health; // 0=dead, 100=full strength public String name; public Alien ( int type , int health, String name) { this.type = type; this.health = health; this.name = name; } } public class AlienPack { private Alien[] aliens; public AlienPack (int numAliens) { aliens = new Alien[numAliens]; } public void addAlien(Alien newAlien, int index) { aliens[index] = newAlien; } public Alien[] getAliens() { return aliens; } public int calculateDamage() { int damage = 0; for (int i=0; i < aliens.length; i++) { if (aliens[i].type==Alien.SNAKE_ALIEN) { damage +=10; // Snake does 10 damage } else if (aliens[i].type==Alien.OGRE_ALIEN) { damage +=6; // Ogre does 6 damage } else if (aliens[i].type== Alien.MARSHMALLOW_MAN_ALIEN) { damage +=1; // Marshmallow Man does 1 damage } } return damage; } } The code is not very object oriented and does not support information hiding in the Alien class. Rewrite the code so that inheritance is used to represent the different types of aliens instead of the “type” parameter. This should result in deletion of the “type” parameter. Also rewrite the Alien class to hide the instance variables and create a getDamage method for each derived class that returns the amount of damage the alien inflicts. Finally, rewrite the calculateDamage method to use getDamage and write a main method that tests the code

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

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Please help me with this using java. And comment the code The following is some code designed by J. Hacker for a video game. There is an Alien class to represent a monster and an AlienPack class that represents a band of aliens and how much damage they can inflict: class Alien { public static final int SNAKE_ALIEN = 0; public static final int OGRE_ALIEN = 1; public static final int MARSHMALLOW_MAN_ALIEN = 2; public int type; // Stores one of the three above types public int health; // 0=dead, 100=full strength public String name; public Alien ( int type , int health, String name) { this.type = type; this.health = health; this.name = name; } } public class AlienPack { private Alien[] aliens; public AlienPack (int numAliens) { aliens = new Alien[numAliens]; } public void addAlien(Alien newAlien, int index) { aliens[index] = newAlien; } public Alien[] getAliens() { return aliens; } public int calculateDamage() { int damage = 0; for (int i=0; i < aliens.length; i++) { if (aliens[i].type==Alien.SNAKE_ALIEN) { damage +=10; // Snake does 10 damage } else if (aliens[i].type==Alien.OGRE_ALIEN) { damage +=6; // Ogre does 6 damage } else if (aliens[i].type== Alien.MARSHMALLOW_MAN_ALIEN) { damage +=1; // Marshmallow Man does 1 damage } } return damage; } } The code is not very object oriented and does not support information hiding in the Alien class. Rewrite the code so that inheritance is used to represent the different types of aliens instead of the “type” parameter. This should result in deletion of the “type” parameter. Also rewrite the Alien class to hide the instance variables and create a getDamage method for each derived class that returns the amount of damage the alien inflicts. Finally, rewrite the calculateDamage method to use getDamage and write a main method that tests the code.

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