Unit 2 Object Oriented Programming

• Objects

Objects

• classes are template to create objects
• objects are instance of class
• methods perform a certain task
• object initialized by calling a constructor

Integer a = 2; //wrapper class
Double b = 3.5;

System.out.println(a);
System.out.println(b)

2
3.5

public class Goblin {
    private String name;
    private int HP;
    private int DMG; //private can only be used within the Goblin class
    private double hitChance;

    public String getName() { // public is method that can be used by anyone
        return name;
    }

    public int getHP() { 
        return HP;
    }

    public int getDMG() {
        return DMG;
    }

    public double getHitChance() {
        return hitChance;
    }

    public boolean isAlive() {
        if (this.HP > 0) {
            return true;
        } else {
            return false;
        }
    }

    public void setName(String newName) {
        this.name = newName; // this refers to current object, whatever Goblin it is used for
    }

    public void setHP(int newHP) {
        this.HP = newHP;
    }

    public void takeDMG(int takenDamage) {
        this.HP -= takenDamage;
    }

    public void setDMG(int newDMG) {
        this.DMG = newDMG;
    }

    public void setHitChance(double newHitChance) {
        this.hitChance = newHitChance;
    }
}

import java.lang.Math;

public class Duel {

    public static void attack(Goblin attackerGoblin, Goblin attackeeGoblin) {

        System.out.println(attackerGoblin.getName() + " attacks " + attackeeGoblin.getName() + "!");
        if (Math.random() < attackerGoblin.getHitChance()) {
            attackeeGoblin.takeDMG(attackerGoblin.getDMG());
            System.out.println(attackerGoblin.getName() + " hits!");
            System.out.println(attackeeGoblin.getName() + " takes " + attackerGoblin.getDMG() + " damage");
        } else {
            System.out.println(attackerGoblin.getName() + " misses...");
        }

        System.out.println(attackeeGoblin.getName() + " HP: " + attackeeGoblin.getHP());
        System.out.println();
    }

    public static void fight(Goblin goblin1, Goblin goblin2) {
        while (goblin1.isAlive() && goblin2.isAlive()) {
            
            attack(goblin1, goblin2);

            if (!goblin1.isAlive()) {
                System.out.println(goblin1.getName() + " has perished");
                break;
            }

            attack(goblin2, goblin1);

            if (!goblin2.isAlive()) {
                System.out.println(goblin2.getName() + " has perished");
                break;
            }
        }
    }

    public static void main(String[] args) { // main method
        Goblin goblin1 = new Goblin();
        goblin1.setName("jeffrey");
        goblin1.setHP(12);
        goblin1.setDMG(2);
        goblin1.setHitChance(0.8);

        Goblin goblin2 = new Goblin();
        goblin2.setName("Gunther the great");
        goblin2.setHP(4);
        goblin2.setDMG(1);
        goblin2.setHitChance(0.8);

        fight(goblin1, goblin2);
    }
}

Duel.main(null);

jeffrey attacks Gunther the great!
jeffrey hits!
Gunther the great takes 2 damage
Gunther the great HP: 2

Gunther the great attacks jeffrey!
Gunther the great hits!
jeffrey takes 1 damage
jeffrey HP: 11

jeffrey attacks Gunther the great!
jeffrey misses...
Gunther the great HP: 2

Gunther the great attacks jeffrey!
Gunther the great misses...
jeffrey HP: 11

jeffrey attacks Gunther the great!
jeffrey hits!
Gunther the great takes 2 damage
Gunther the great HP: 0

Gunther the great attacks jeffrey!
Gunther the great hits!
jeffrey takes 1 damage
jeffrey HP: 10

Gunther the great has perished