Can you have nested enum in Java?

We can have a nested enum type declaration inside a class, an interface, or another enum type. Nested enum types are implicitly static. Since an enum type is always static, we cannot declare a local enum type inside a method’s body.

Can you have nested enum in Java?

We can have a nested enum type declaration inside a class, an interface, or another enum type. Nested enum types are implicitly static. Since an enum type is always static, we cannot declare a local enum type inside a method’s body.

What is nested enum in Java?

Department enum defined above is a nested enum type as it is ‘nested’ inside another class. Nested enum types are implicitly static, and hence mentioning static in their definition is actually redundant. An enum constant of static nested enum Department type can be accessed using the syntax – .

Can we have enum inside enum?

Yes, we can define an enumeration inside a class. You can retrieve the values in an enumeration using the values() method.

What is Java enum with example?

An enum type is a special data type that enables for a variable to be a set of predefined constants. The variable must be equal to one of the values that have been predefined for it. Common examples include compass directions (values of NORTH, SOUTH, EAST, and WEST) and the days of the week.

Can we define enum inside a method in Java?

We can an enumeration inside a class. But, we cannot define an enum inside a method. If you try to do so it generates a compile time error saying “enum types must not be local”.

Can enum extend class in Java?

We cannot extend enum classes in Java. It is because all enums in Java are inherited from java.

When should I use enum in Java?

Enums are lists of constants. When you need a predefined list of values which do represent some kind of numeric or textual data, you should use an enum. You should always use enums when a variable (especially a method parameter) can only take one out of a small set of possible values.

How do you write multiple enums in Java?

String[] digit = {“one”, “two”, “three”}; String[] teen= {“ten”, “twenty”, “thirty”}; String[] anchors = {“hundred”, “thousand”, “million”}; I’m thinking of transferring these to enums separately, so I will have 3 enum classes: digit , teen and anchors with getValue methods implemented.

Can enum extend another enum in Java?

No, we cannot extend an enum in Java. Java enums can extend java. lang. Enum class implicitly, so enum types cannot extend another class.

Can enum extend another enum?

Why enum is used in Java?

Enums are used when we know all possible values at compile-time, such as choices on a menu, rounding modes, command-line flags, etc. It is not necessary that the set of constants in an enum type stay fixed for all time. In Java (from 1.5), enums are represented using enum data type.

Can we declare enum inside main?

Yes, it is perfectly ok to define an enum inside a function.

Can enum be abstract?

Enums can define abstract methods, which each enum member is required to implement. This allows for each enum member to define its own behaviour for a given operation, without having to switch on types in a method in the top-level definition.

Can you inherit enum?

Enums cannot inherit from other enums. In fact all enums must actually inherit from System. Enum . C# allows syntax to change the underlying representation of the enum values which looks like inheritance, but in actuality they still inherit from System.

Why enums are better than constants in Java?

The only difference is that enum constants are public , static and final (unchangeable – cannot be overridden). An enum cannot be used to create objects, and it cannot extend other classes (but it can implement interfaces).

Can enum have 2 values?

The Enum constructor can accept multiple values.

How do I put multiple values in an enum?

we should do the following steps to have an enum with different values:

  1. Create enum constructor which accepts multiple values.
  2. Assign each constructor argument to a member field in the enum definition.
  3. Create getter methods so we can access any of the values assigned to a particular enum constant.

Can enum inherit enum Java?

Java Enum and Interface As we have learned, we cannot inherit enum classes in Java. However, enum classes can implement interfaces.

Can enum have a constructor?

enum can contain a constructor and it is executed separately for each enum constant at the time of enum class loading. We can’t create enum objects explicitly and hence we can’t invoke enum constructor directly.

Can enum implement interface?

Yes, Enum implements an interface in Java, it can be useful when we need to implement some business logic that is tightly coupled with a discriminatory property of a given object or class.