Java Programming: Create two classes: Alien: An Alien has an int health and an i

Question

Java Programming:

Create two classes:

Alien: An Alien has an int health and an int damage (reflecting it's own health and the damage it does to other aliens).

Constructors:
Alien(int, int): sets both values. Assume for now that the values are valid.
Alien(Alien): Creates a copy of the Alien passed in.

Methods:
Boolean isAlive(): True of health > 0, false otherwise
void takeDamage(int): reduce health by argument amount
int getDamage(): return damage value
int getHealth(): return health value
toString()

Second class:
Alien Pack:

Contains an array of alien references and an int indicating the next open location in the array.
Constructors:
AlienPack(int): creates the array with the specified size. No Aliens are created here.
AlienPack(AlienPack): Creates the array as a copy of the array in the alienPack passed in. This is tricky, and you don't have to get it totally right. This constructor should be deep copied.

Methods:
void addAlien(Alien): adds an alien to the pack (puts it in the array) if there is a spot in the array. Otherwise do nothing. This alien is added without deep copying.
int getTotalDamage(): returns the total damage the pack can cause.

Explanation / Answer

// Alien.java

public class Alien{
   int health;
   int damage;
   Alien(int h, int d){
       health = h;
       damage = d;
   }
   Alien(Alien a){
       this.health = a.health;
       this.damage = a.damage;
   }
   boolean isAlive(){
       if(health > 0) return true;
       else return false;
   }
   void takeDamage(int d){
       damage -= d;
   }
   int getDamage(){
       return damage;
   }
   int getHealth(){
       return health;
   }
   public String toString(){
       return "Health: " + health + ", damage: " + damage;
   }
}

// AlienPack.java

public class AlienPack{
   Alien array[];
   int next;
   AlienPack(int size){
       array = new Alien[size];
   }
   AlienPack(AlienPack a){
       this.array = a.array;
       this.next = a.next;
   }
   void addAlien(Alien a){
       if(next < array.length){
           array[next] = a;
       }
   }
   int getTotalDamage(){
       int total = 0;
       for(int i = 0; i < next; i++){
           total += array[i].damage;
       }
       return total;
   }
}

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