Why is enum in Java bad?
The problem with Java 1.5 enum is that it is not Object-Oriented. You can’t extend an enum, you can’t add an element in an existing enum. Many will say “but that’s what enum is for, a static list of things”. … Enum promotes bad programming practices.
Why we should not use enum?
The problems with enums in database
Enums do not allow translation into other languages. Enums are not ANSI standard and are therefore implemented differently (if at all) in different database engines. When using a text string to compare within code it is possible to misspell it and the language will not warn you.
Is it bad to use enum?
It provides strong type safety. They have some disadvantages at times, but this is really typically related to situations where every possible option is not known in advance. If you have a fixed set of options, such as your example, then strong typed enums are a good thing, and should not be avoided.
Should you use enums 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.
Is enum final class?
Java does not allow you to create a class that extends an enum type. Therefore, enums themselves are always final, so using the final keyword is superfluous. Of course, in a sense, enum s are not final because you can define an anonymous subclass for each field inside of the enum descriptor.
Are enums classes in Java?
Enum Class in Java
In Java, enum types are considered to be a special type of class. It was introduced with the release of Java 5. An enum class can include methods and fields just like regular classes.
Why is enum bad mysql?
You can’t reuse the member-list of an ENUM column in other tables. When you create a list of possible members in an ENUM column, there’s no easy and consistent way to re-use that list in other tables. With a reference table, the same set of data can be related to as many other tables as required.
Is enum a model?
The definition I have for models is that they represent knowledge. With that logic, an enum should be a model. Moreover, I have seen in some codebases that enums are stored as tables in the DB so that the knowledge is stored in the DB itself and can be accessed later for joins, or from code.
Where should I put enum class?
Put the enums in the namespace where they most logically belong. (And if it’s appropriate, yes, nest them in a class.)
Why do enums smell?
Enumerations (or enum types for short) are a thin language wrapper around an integral type. … Using enums for control flow or more robust abstractions can be a code smell. This type of usage leads to fragile code with many control flow statements checking values of the enum.
Can we convert enum to string?
We can convert an enum to string by calling the ToString() method of an Enum.
What is the point of enum Java?
The main objective of enum is to define our own data types(Enumerated Data Types). Declaration of enum in java : Enum declaration can be done outside a Class or inside a Class but not inside a Method.
What is the benefit of enum in Java?
Enum provides type-safe; Enum variable can be assigned only with predefined enum constants otherwise it will issue compilation error. Enum can be used in switch-case Java control statement. Enum has its own namespace.
Can enum be private in Java?
The enum constructor must be private . You cannot use public or protected constructors for a Java enum . If you do not specify an access modifier the enum constructor it will be implicitly private .