what enum

In the long run, creating enumeration can save a lot of time and reduce a lot of trouble. Enumeration has at least three advantages over unformatted integers: ● Enumeration makes the code easier to maintain and helps to specify valid and expected

Usage and difference of the set and enum types in mysql Usage and difference of the set and enum types in mysql In mysql, both enum and set are of the string type and can only be set, The difference is that set can take multiple values, and enum

Enumeration (enum) links a string of names with a string of reshaping values in a simple way. Can replace the #define Declaration Enumerate in general form: Enum Optional label {content ...} Optional definition variable definition; Where "content ...

Reference 55049192This explains why an enumeration class cannot be inherited: it has inherited the parent enum class, and its parent implements the serializable interface, which means that all enum classes implement serializationThe Enum class also

C # convert enum to string for Enumeration type conversion All enumeration types are value types. System. enum is an abstract class. All enumeration types inherit from it directly, and of course all its members. All value types are system. the

Http://apps.hi.baidu.com/share/detail/23749270 1. Definition of EnumEnum Fabric {Cotton = 1, silk = 2, wool = 4, rayon = 8, other = 128} 2. Conversion between symbol names and constant values Fabric Fab = fabric. cotton; int fabnum =

C # mutual conversion of Enum, Int, and String, Enum provides a base class for enumeration. The base type can be any integer except Char. If the basic type is not explicitly declared, Int32 is used. Programming Languages generally provide syntax to

Use and Analysis of Enum and use analysis of Enum Example: package test;public enum ColorEnum { RED, YELLOW, BLUE, GREEN, BLACK,;} Obviously, enum is similar to a special class. In fact, the type defined by enum is a class. These

What is an enumeration? Enumerations are new features introduced by JDK5. In some cases, the objects of a class are fixed and can be defined as enumerations. In practice, enumeration types can also be used as a specification to guarantee the safety

In general, we use the C-style enum keyword to define enumeration types.enum{Uiviewanimationtransitionnone,Uiviewanimationtransitionflipfromleft,Uiviewanimationtransitionflipfromright,Uiviewanimationtransitioncurlup,Uiviewanimationtransitioncurldown,

Get all possible values for enum (enum) columns in MySQL there is really no need for any other functions to support it, just use some of the SQL statements provided by MySQL. For the sake of simplicity, take the MySQL system table user as an example

In general, we use the C-style enum keyword to define enumeration types.enum { uiviewanimationtransitionnone, uiviewanimationtransitionflipfromleft, Uiviewanimationtransitionflipfromright, Uiviewanimationtransitioncurlup,

An enumeration type, the Enum keyword, was added to Java SE5. Before this, when you need to create a set of shaped constants, but these enumerated values do not necessarily limit their own values within the range of the constant set, so it is not

Create a model in which you write a method that gets the enumeration classClass Student extends zend_db_table{protected $_name = ' student ';Protected $_primary = ' id ';function Getpartyenum ($enumname) {Adapter and get the data$db =

Since the C language, The enum type has been introduced into the language as a constant of a finite set of user-defined classes.And once became the only method for defining constants in the compilation period in C ++ (a static integer constant was

PHP low-level programming Brothers to look at this problem, I make the following statement, I hope to be able to objectively understand the advantages and disadvantages of this enum field: Fat brother Point of view:An enum has advantages. But

Usage One: Constantsin the JDK1.5 before, we define constants that are: Public static fianl .... . Now, with enumerations, you can group related constants into an enumeration type, and enumerations provide more methods than constants.  public enum

Brief introductionAn enum, called enumeration, is a new feature introduced in JDK 1.5 and is housed in a Java.lang package.Creating an enumeration type to use the enum keyword implies that the type created is a subclass of the Java.lang.Enum class

Marshine (Original layout format: http://www.marshine.com) Reversion: 2004/5/28Change Description: ThanksNinputerThe CLs compatibility problem was mentioned. At the same time, the equals rewriting not mentioned in the original version was

The examples in this article describe the use of enum (enum) in PHP. Share to everyone for your reference, specific as follows: PHP actually has the Enum class library, you need to install the Perl extension, so it is not a standard extension of