Java: Enum

Notice the enum keyword which is used in place of class or interface. The Java enum keyword signals to the Java compiler that this type definition is an enum.

public enum Level {
    HIGH,
    MEDIUM,
    LOW
}
Level level = Level.HIGH;

Immutable class in Java

Immutable object offers several benefits in multi-threaded programming and it’s a great choice to achieve thread safety in Java code. here are few rules, which helps to make a class immutable in Java :

Java: Difference between >>> and >>