What is the difference between enums and constants in Java?

What is the difference between enums and constants in Java?

In Java, constants are typically defined using the final keyword, while enums are a special type that defines a set of named values.

Can you give me an example of how to use enums?

Sure! Here's a simple example:

public enum Day {
    SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY
}

You can use it like this:

Day today = Day.MONDAY;

When should I use enums instead of constants?

Use enums when you have a fixed set of related constants, as they provide type safety and can have methods and fields.

Are there any performance differences between using enums and constants?

Generally, enums may have a slight overhead due to their object-oriented nature, but the difference is often negligible in most applications.