Constant Interface Anti-Pattern

Don’t do this and don’t implement it for your class.

// Don't do this.
public interface Constants {
    public static final int SOME_CONSTANT = 1;
}

// Don't implement it.
public class YourClass implements Constants { ... }

It is bad because:

• A public constant is a part of public API and a (serious) commitment.
• Implementing random interfaces pollutes your class’ and sub-classes’ name space (use static import instead).
• In general, interface should carry an intent or information of type hierarchy.