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Java Enums. A Java Enum is a special Java type used to define collections of constants. More precisely, a Java enum type is a special kind of Java class. An enum can contain constants, methods etc.Java enums were added in Java 5. Java Enum is a special Java type used to define collections of constants. More precisely, a Java enum type is a special kind of Java class. An enum can contain constants, methods etc. Java enums were added in Java 5.
The main classes and interfaces in java.lang are: 1  Object â the class that is the root of every class hierarchy. 2  Enum â the base class for enumeration classes (as of J2SE 5.0).  Class â the class that is the root of the Java reflection system.