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This is a special type of class. Enum keyword defines a fixed set of constants. Enum constructors are always private or default.
specifies whether a class inherits from another class or interface, or an interface inherits from another interface.
If method is final its cannot be overridden. final variable must be initialized only once.
Its used in try/catch structure. It is used to release resources or perform cleanup tasks.
A primitive data type that can store 32-bit floating-point numbers, from 1.4e-45 to 3.4e+38.