package state;

/**
 * State Design Pattern — Runnable Demo
 * Run: javac state/*.java -d out/state && java -cp out/state state.Main
 * Article: https://ankurm.com/state-design-pattern-java/
 */
public class Main {
    public static void main(String[] args) {
        System.out.println("=== State Design Pattern Demo ===\n");

        TrafficLight light = new TrafficLight();
        System.out.println("Starting state: " + light.getColor());

        System.out.println("\n-- Cycling through states --");
        for (int i = 0; i < 6; i++) {
            light.next();
        }

        System.out.println("\n-- Without State pattern: a single class with if/else --");
        System.out.println("   Every new state adds to every method's if-else chain.");
        System.out.println("   With State: add one new class, touch nothing else.");

        System.out.println("\n=== Demo complete ===");
    }
}