Java constant definition

How to manage constants collectively in Java There are three types that you know other than properties. Which one should be implemented? Story

Constant interface
Constant class
enum class

Use an enum. I've heard that it's defined in the interface, but I've never seen it.

Example of implementing a constant interface (quoted from Effective Java 2nd Edition Item 19)

public interface PhysicalConstants {
    //Avogadro constant (1/mol）
    static final double AVOGADROS_NUMBER = 6.02214199e23;
    //Boltzmann constant (J/K）
    static final double BOLTZMANN_CONSTANT = 1.3806503e-23;
    //Electron mass (kg)
    static final double ELECTRON_MASS = 9.10938188e-31;
}

Implement and use.

I have never seen it. .. Does it mean that if the number of constant interfaces increases, it will be implemented as much as necessary? The name seems to be covered. .. High degree of coupling. It's not how to use the interface.

Example of implementing a constant class

public final class Constants {
    public static final String PATH_SEP = "/";
    public static final String LINE_SEP = "¥n";
    private Constants (){}
}

Finalized and cannot be inherited.
Cannot be instantiated with private constructor.

If the person who makes it first changes the class name to Constants, it will become bloated. It's almost like that.

Example of implementing in enum class

public enum ExamEnum {
    SUNDAY(0),
    MONDAY(1),
    TUESDAY(3),
    WEDNESDAY(4),
    THURSDAY(5),
    FRIDAY(6),
    SATURDAY(7);
}

Singleton forced
Can be type safe
Various methods provided by enum class
Keep order

Someday I started using it because it was called "constant class (laughs)". Compared to others, there are no disadvantages other than the amount of code to be implemented, so I continue to use it. Once you write the amount of code, you can do basic things with copy and paste. .. I won't write it here because there are many good ways to use it.