what enum

Enum enum is the keyword in both C + + and Java, but they are not the same. For C + +, enumerations are a series of named Integer constants, and conversion from enumeration values to corresponding integer values is done internally. For Java,

Objective In daily programming, there are often such "datasets," whose values are stable in the program, and the elements in the dataset are finite. For example, from Monday to Sunday, seven data elements constitute a week of "data sets", Four

Enumeration as a general language concept, until the birth of Java5 has to say a bit strange, so far many programmers still prefer to use static final form to name constants without using, in general, Java programmers in this way to implement

1 //The enum type before c++11 is inherited from C, tepid;2 //c++11 to enum, strengthen the type check, the introduction of the type of strongly-typed enum, the immediate bright3 //Have used QT all know, long ago should do so, with very cool!! 4 5

In most programming languages, enum types are a common and essential type of data, and of course, Java is no exception. However, the enum enum type in Java has many unexpected uses, let's take a look at it.1. You can add variables and methods to the

Secrets of Enum : Enum is a "user-defined type" Haha, Enum is rarely used in practice, so you will ignore it. However, here, I tell you that Enum is of the same user-defined type as struct and class.Yes! Enum is a user-defined type. It has data

Gain an in-depth understanding of enum in Java and Javaenum We can use either the public static final String constant or the enum String constant to represent a limited number of things in a program. In general, the former is simple, but it cannot

Enum Type 1, overview, JDK1.5 added enum type, you can use an enum to define eg: public enum gender{ Male,female; }Each of these enumeration elements is an instance of the enumerated type, using and traversing

I. Overview An 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

The Enum permission is best placed outside the class, and the enum permission isZookeeper Enum permission allows you to store different values flexibly to avoid code flooding with numbers that cannot be interpreted. Although it can be called in both

　　This article is mainly about enumeration types of the base class enum class to do an introduction:First, the Enum class is located under the Java.lang package, and according to the class's introduction, the Enum class is the parent of all

I. Convert string to Enum in C:   Object enum. parse (system. Type enumtype, string value, bool ignorecase ); Therefore, we canCodeWrite as follows: Enum colour {red, green, blue }//... colour c = (colour) enum. parse (typeof (colour),

First, the generation of enumThe syntax of enumerations, including Enum,enumset,enummap, is introduced in Java1.5. Where enum is the enumerated type that we have seen in C or C + +, the enumeration in Java is more sophisticated and complex than the

Suppose you need several possible values for a variable, then it can be defined as an enumeration type. The reason for enumeration is to enumerate the possible values of variables or objects.For example, to make everyone more clear, for example,

If a variable requires several possible values, it can be defined as an enumeration type. The reason for enumeration is to enumerate the possible values of variables or objects. For example, to make everyone better understand, for example, there

ENUMis a string object whose value is usually selected from a list of allowed values, which is explicitly enumerated in the column specification when the table is created.In some of the following cases, the value can also be an empty string ( "" )

Suppose you need several possible values for a variable, then it can be defined as an enumeration type. The reason for enumeration is to enumerate the possible values of variables or objects.For example, to make everyone more clear, for example,

Blog (http://blog.csdn.net/livelylittlefish) Post the notes prepared by the author (@ Xiaoyu) on the relevant research and study content. You are welcome to correct them!   1. macro definition   # Define aspect_ratio 1.653 The macro definition

# This is a learning note for the Liaoche teacher Python tutorial1. Overviewwhen we need to define regular constants, such as the month. We can use the Enum class to implement this function1.1. Direct use of enum classfrom enum import enummonth =

Writer:bysocket (mud and brick pulp carpenter)Micro-Blog: BysocketWatercress: BysocketReprint it anywhere u want.Written in the FontWhen we are set some constants for projects, we always use the ' public static final ' to set INT or String constants.