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Java
OOP GUIDE / WORK
WEAPON CLASS SOLUTIONS
TASK –
PART 1 – PARTIAL WEAPON CLASS
No Work
TASK –
PART 2 – COMPLETE THE CLASS
Here is my
class:
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public class Weapon
{
private String name;
private int lowDamage;
private int highDamage;
private int damageBonus;
public Weapon(String
name, int ld, int hd, int db)
{
this.name = name;
lowDamage = ld;
highDamage = hd;
damageBonus = db;
}
public String getName()
{
return name;
}
public int getLowDamage()
{
return lowDamage;
}
public int getHighDamage()
{
return highDamage;
}
public int getDamageBonus()
{
return damageBonus;
}
public int getDamageAmount()
{
int dif = highDamage - lowDamage;
int dmg = lowDamage + (int)(Math.random() * (dif + 1)) + damageBonus;
return dmg;
}
public String toString()
{
return name + "(" + lowDamage + "-" + highDamage + ") + " + damageBonus;
}
public void enchantWeapon()
{
damageBonus++;
}
}
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TASK –
PART 3 – CODE ANALYSIS
Answer the
following questions:
A)
Is the class
mutable or immutable? Explain.
Answer: It is mutable
because the enchantWeapon() method changes an
instance variable.
B)
What will the
following code output to screen? Try
to figure it out before running it.
Weapon w1 = new Weapon("Sword", 4, 8, 0);
System.out.println(w);
Answer:
Sword (4-8) + 0
C)
What will the
following code output to screen? Try
to figure it out before running it.
Weapon w2 = new Weapon("Club", 3, 5, 0);
w2.enchantWeapon();
w2.enchantWeapon();
System.out.println(w2);
Answer: Club (3-5) + 2
D)
What will the
following code output to screen? Try
to figure it out before running it.
Weapon w3 = new Weapon("Nunchucks", 2, 4,
0);
System.out.println(w3.getDamageAmount());
Answer:
A random integer between 2 and 4, inclusively.
E)
What will the
following code output to screen? Try
to figure it out before running it.
Weapon w4 = new Weapon("Spear", 4, 8, 0);
w4.enchantWeapon();
System.out.println(w4.getDamageAmount());
Answer: A random integer
between 5 and 9, inclusively.
F)
Can the value of damageBonus ever be negative?
Answer: Yes it can initially
be set to a negative value when the Weapon is constructed.
G)
Add an instance
method named curseWeapon() that does the opposite of enchantWeapon().
Here is my method:
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public void curseWeapon()
{
damageBonus--;
}
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H)
Add an instance
method named getDescriptiveName() that returns the name of the weapon with a descriptor
if the damageBonus is too low or too high. If it is less or equal to -2, the weapon is
“Cursed”. If it is greater or equal to
2, then the weapon is “of Power”.
For example,
·
A Sword with a damageBonus of 3 is a Sword of Power.
·
A Staff with a damageBonus of -1 is a Staff.
·
A Spear with a damageBonus of -2 is a Cursed Spear.
Here is my method:
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public
String getDescriptiveName()
{
if (damageBonus >= 2)
return name + "
of Power";
else if (damageBonus <= -2)
return "Cursed
" + name;
else
return name;
}
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I)
Update the toString()
method so that it uses getDescriptiveName() instead
of the regular name.
Here is my updated toString()
method:
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public String toString()
{
return getDescriptiveName() + "(" + lowDamage + "-" + highDamage + ") + " + damageBonus;
}
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J)
What will the
following code output to screen? Try
to figure it out before running it.
Weapon w5 = new Weapon("Axe", 5, 7, 0);
w5.enchantWeapon();
w5.enchantWeapon();
System.out.println(w5);
Answer: Axe of Power (5-7) + 2
K)
What is the least
amount of enchantments needed to convert a cursed weapon into a powerful
weapon?
Answer:
4
Explanation: The best cursed weapon has a -2 damageBonus. It takes 4 increases of 1 to get a damageBonus of 2, which is the minimum for a powerful
weapon.
L)
In the main method
of a tester class, create a few weapons.
Test out all of the instance methods.
Here
is my tester class:
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public class WeaponTester
{
public static void main(String[] args)
{
Weapon weapon = new Weapon("Dagger", 1, 3, 0);
weapon.enchantWeapon();
weapon.enchantWeapon();
System.out.println(weapon);
weapon.curseWeapon();
System.out.println(weapon);
System.out.println("Damage: " + weapon.getDamageAmount());
System.out.println("=====");
Weapon weapon2 = new Weapon("Morning Star", 6, 6, 0);
weapon2.curseWeapon();
weapon2.curseWeapon();
System.out.println(weapon2);
System.out.println("Damage: " + weapon2.getDamageAmount());
System.out.println("=====");
Weapon weapon3 = new Weapon("Mjolnir", 3, 4, 0);
System.out.println(weapon3);
System.out.println("Mr. Campeau, Odin will enchant your hammer!");
for (int i=0; i<100; i++)
weapon3.enchantWeapon();
System.out.println(weapon3);
System.out.println("Damage: " + weapon3.getDamageAmount());
}
}
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Here is what
my tester class outputs:
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Dagger
of Power(1-3) + 2
Dagger(1-3) + 1
Damage:
4
=====
Cursed
Morning Star(6-6) + -2
Damage:
4
=====
Mjolnir(3-4) + 0
Mr.
Campeau, Odin will enchant your hammer!
Mjolnir
of Power(3-4) + 100
Damage: 104
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