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  • Not always, you can use interface in one class if that class is a generic class. Commented Aug 8, 2012 at 5:29
  • 6
    Furthermore, you can introduce an interface when finally needed easily in modern IDE with an "extract interface" refactoring. Commented Aug 13, 2012 at 18:57
  • Consider a utility class where there are only public static methods and a private constructor - perfectly acceptable and promoted by authors like Joshua Bloch et al. Commented Mar 23, 2016 at 14:27