Manage Constants in Project

Main.java

		// definition
		public final class Constants {

			private Constants() {
				// restrict instantiation
			}

			public static final double PI = 3.14159;
			public static final double PLANCK_CONSTANT = 6.62606896e-34;
		}
		//Usage :

		import static Constants.PLANCK_CONSTANT;
		import static Constants.PI;//import static Constants.*;

		public class Calculations {

			public double getReducedPlanckConstant() {
				return PLANCK_CONSTANT / (2 * PI);
			}
		}