Lesson 1.10

CSA Unit 1.10 : Calling Class Methods

Popcorn Hack #1

class Bro {
    String name;
    static String catchphrase = "Sup bro?";

    public Bro(String name) {
        this.name = name;
    }

    public void sayHi() {
        System.out.println("Hey, I'm " + name);
    }

    public static void sayCatchphrase() {
        System.out.println(catchphrase);
    }

    public static void main(String[] args) {
        sayCatchphrase();

    

        Bro alex = new Bro("Alex");
        alex.sayHi();

        alex.sayCatchphrase();
    }
}

Homework Hack

public class BattleGame {

    // Define the object class
    static class Fighter {
        // Instance variables — unique for each object
        String name;
        int power;
        int health;

        // Static variable — shared by all fighters
        static double fightDuration = 0.0;

        // Constructor
        public Fighter(String name, int power, int health) {
            this.name = name;
            this.power = power;
            this.health = health;
        }

        // Instance method: attack another fighter
        public void attack(Fighter opponent) {
            System.out.println(name + " attacks " + opponent.name + " with power " + power + "!");
            opponent.health -= power; // reduce opponent’s health
            if (opponent.health < 0) opponent.health = 0;
            fightDuration += 1.5; // each attack adds time
        }

        // Instance method: print current status
        public void printStatus() {
            System.out.println(name + " → Health: " + health + " | Power: " + power);
        }

        // Static method: determine stronger fighter (by power)
        public static int strongerFighter(Fighter f1, Fighter f2) {
            if (f1.power > f2.power) {
                return 1;  // f1 stronger
            } else if (f1.power < f2.power) {
                return 2;  // f2 stronger
            } else {
                return 0;  // tie
            }
        }

        // Static method: begin the battle
        public static void beginBattle(Fighter f1, Fighter f2) {
            System.out.println("\n The battle begins between " + f1.name + " and " + f2.name + "! ⚔️");
            fightDuration = 0.0;
        }
    }

    public static void main(String[] args) {
        Fighter robot = new Fighter("RoboX", 25, 100);
        Fighter dino = new Fighter("T-Rex", 20, 120);

        Fighter.beginBattle(robot, dino);

        robot.attack(dino);
        dino.attack(robot);
        robot.attack(dino);

        System.out.println();
        robot.printStatus();
        dino.printStatus();

        int result = Fighter.strongerFighter(robot, dino);
        if (result == 1) {
            System.out.println("\n " + robot.name + " is the stronger fighter!");
        } else if (result == 2) {
            System.out.println("\n " + dino.name + " is the stronger fighter!");
        } else {
            System.out.println("\n Both fighters are equally strong!");
        }

        System.out.println("\n Total fight duration: " + Fighter.fightDuration + " seconds.");
    }
}

 The battle begins between RoboX and T-Rex!


RoboX attacks T-Rex with power 25!
T-Rex attacks RoboX with power 20!
RoboX attacks T-Rex with power 25!

RoboX → Health: 80 | Power: 25
T-Rex → Health: 70 | Power: 20

 RoboX is the stronger fighter!

 Total fight duration: 4.5 seconds.