Difference between java enum with no values and utility class with private constructor

Question

A common thing to do to utility classes is to give them a private constructor:

public final class UtilClass {
    private UtilClass() {}

    ...
}
         


        

Answer 1

The following pattern in utility classes also provides ironclad guarantee that there can be no instances:

public abstract class Util {
    private Util() { throw new Error(); }
    ... // static methods
}

Besides, you have no additional irrelevant static methods, provided by enums.