Question

What is the correct approach for a utility class having all methods with public static.
Should I use final class or abstract class?
Please give suggestion.
As for example:

public final class A{ 
    public static void method(){
        /* ... */
    }
}

OR

public abstract class A{
    public static void method(){
        /* ... */
    }
}

Answer 1

abstract has its own purpose. If you want some of the class functionality implemented by other classes (override) then you use abstract.

If it is just utility class, but you don’t want other classes subclass it, then I would go with final class. If utility class has just static methods, any way you can’t override them, so it doesn’t make difference to have them in non-final class also.