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https://stackoverflow.com/questions/26326291/how-does-java-support-instance-variables-of-java-enum-constants
I mean it "seems" the static enum constant is using a non-static instance variable which is not possible normally? It is absolutely possible: each static variable in the enum is an object in its own right, complete with its instance variables. The instance is static in the enum, but it does not make the context of the instance itself a static context. ...
https://docs.oracle.com/javase/tutorial/java/javaOO/enum.html
Note: All enums implicitly extend java.lang.Enum. Because a class can only extend one parent (see Declaring Classes), the Java language does not support multiple inheritance of state (see Multiple Inheritance of State, Implementation, and Type), and therefore an enum cannot extend anything else.
https://www.geeksforgeeks.org/enum-in-java/
Sep 26, 2016 · Enum and Inheritance : All enums implicitly extend java.lang.Enum class. As a class can only extend one parent in Java, so an enum cannot extend anything else. toString() method is overridden in java.lang.Enum class,which returns enum constant name. enum can implement many interfaces. values(), ordinal() and valueOf() methods :2.6/5
https://www.mindprod.com/jgloss/enum.html
enum Java version 1.5 or later has built-in support for enumerated types. Prior to that you had to kludge them in some way with static final int s (which were not typesafe) or with Object s which would not work in switch statements.
https://docs.oracle.com/javase/7/docs/api/java/lang/Enum.html
This is the common base class of all Java language enumeration types. More information about enums, including descriptions of the implicitly declared methods synthesized by the compiler, can be found in section 8.9 of The Java™ Language Specification. Note that when using an enumeration type as the type of a set or as the type of the keys in a map, specialized and efficient set and map ...
https://www.geeksforgeeks.org/enumeration-enum-c/
Oct 31, 2014 · Enumeration (or enum) is a user defined data type in C. It is mainly used to assign names to integral constants, the names make a program easy to read and maintain. enum State {Working = 1, Failed = 0}; The keyword ‘enum’ is used to declare new enumeration types in C and C++. Following is an example of enum declaration.2/5
https://www.javatpoint.com/enum-in-java
Java Enums can be thought of as classes which have a fixed set of constants (a variable that does not change). The Java enum constants are static and final implicitly. It is available since JDK 1.5. Enums are used to create our own data type like classes. The enum data type (also known as Enumerated Data Type) is used to define an enum in Java ...
https://crunchify.com/why-and-for-what-should-i-use-enum-java-enum-examples/
Some very important points on Java Enum: Point-1. All enums implicitly extend java.lang.Enum.Since Java does not support multiple inheritance, an enum cannot extend anything else.. Point-2. Enum in Java are type-safe: Enum has there own name-space. It means your enum will have a type for example “Company” in below example and you can not assign any value other than specified in Enum Constants.
https://howtodoinjava.com/java/enum/enum-tutorial/
Java enum, also called Java enumeration type, is a type whose fields consist of a fixed set of constants. The very purpose of enum is to enforce compile time type safety. enum keyword is reserved keyword in Java. We should use enum when we know all possible values of a variable at compile time or ...
https://docs.oracle.com/javase/8/docs/technotes/guides/language/enums.html
Two classes have been added to java.util in support of enums: special-purpose Set and Map implementations called EnumSet and EnumMap. EnumSet is a high-performance Set implementation for enums. All of the members of an enum set must be of the same enum type. Internally, it is represented by a bit-vector, typically a single long. Enum sets ...
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