FitnessTrackerSystem

public class FitnessTrackerSystem {
    public static void main(String[] args) {
        Workout w1 = new Workout();
        w1.displayWorkout();

        Workout w2 = new Workout("Cycling");
        w2.displayWorkout();

        Workout w3 = new Workout("Swimming", 45);
        w3.displayWorkout();

        Workout w4 = new Workout("Running", 60);
        w4.displayWorkout();

        Workout w5 = new Workout("Yoga", 50);
        w5.displayWorkout();

        Workout w6 = new Workout("Strength Training", 75);
        w6.displayWorkout();

        Workout w7 = new Workout("Dancing", 40);
        w7.displayWorkout();
    }
}

class Workout {
    private String activityName;
    private int durationInMinutes;
    private int caloriesBurned;

    public Workout() {
        this.activityName = "Walking";
        this.durationInMinutes = 30;
        this.caloriesBurned = 100;
    }

    public Workout(String activityName) {
        this.activityName = activityName;
        this.durationInMinutes = 30;
        this.caloriesBurned = this.durationInMinutes * 5;
    }

    public Workout(String activityName, int durationInMinutes) {
        this.activityName = activityName;
        this.durationInMinutes = durationInMinutes;
        this.caloriesBurned = durationInMinutes * 5;
    }

    public void displayWorkout() {
        System.out.println("Workout Summary");
        System.out.println("Activity       : " + activityName);
        System.out.println("Duration       : " + durationInMinutes + " minutes");
        System.out.println("Calories Burned: " + caloriesBurned + " kcal");
        System.out.println("----------------------------------");
    }
}