Utility Class Using Enum

A utility class using enum:

public enum StringUtil
{
    ;  // enum terminator

    public static void boo ()
    {
        // ...
    }
}

A utility class using class:

public final class StringUtil
{
    public static void boo () {
        // ...
    }

    private StringUtil() {
        // no-init ctor
    }   
}

When using Enum

    ✔ no need for constructor

    ✔ singleton by default

    ✖ automatically extends base Enum class

    ✖ ihnerited Enum methods (name, etc.) available for utility class user

    ✖ Enum static methods (values, etc.) available for utility class user