/**
 * {@link <a href=
 * "https://[Log in to view URL]" target=
 * "_blank">Singleton factory</a>}
 * 
 * @author itammb ( Italia Massimiliano Buscati )
 * @version JDK 1.15
 *
 */
class Main {
	public static class MySingleton {
		private static MySingleton instance = null;
		public int x = 10;

		private MySingleton() {
			;
		}

		public static MySingleton getInstance() {
			if (instance == null)
				instance = new MySingleton();

			return instance;
		}
	}

	public static void main(String args[]) throws Exception {
		// Unit test - singleton factory

		MySingleton a = MySingleton.getInstance();
		MySingleton b = MySingleton.getInstance();
		a.x = b.x + 10;
		System.out.println("a.x = " + a.x);
		System.out.println("b.x = " + b.x);
	}
}