Constant interface

In the Java programming language, the constant interface anti-pattern describes the use of interfaces to define constants. This would enable implementors of the interface to use the constants as member variables. However, it is considered inappropriate to define an interface for other purposes than defining methods.

Example

public interface Constants {

	static final double PI = 3.14159;

	static final double PLANCK_CONSTANT = 6.62606896e-34;

}


public class Calculations implements Constants {

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

}