One instance with methods in java

Question

I am wondering how to program a solution, which I think is a matter of style. I need to have a single instance of a class that only has methods and attributes. To get this in java, I have two options:

• create an abstract class with static methods inside, so it will not be possible to create any instance of the class, and this is normal,
• use singleton pattern with public methods.

I tend to go for the second approach, although I met 1. What and why is better than that, or is there a third option.

Answer 1

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Answer 2

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public class myClass {

   /** This class should never be instantiated. */
   private myClass() {
   }

   public static void myMethod() {

   }

   ...
   //etc
   ...
}

Answer 3

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Answer 4

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Answer 6

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You can still implement the interface if you ever need to challenge the implementation during testing.