enumeration class

Dark Horse programmer java training 26th Day Notes1. Reflection (class loading overview and loading time)A: Overview of loading classesWhen a program wants to use a class, if the class has not yet been loaded into memory, the system initializes the

One of the best features added in ASP. NET 2.0 is the new membership service, which provides easy-to-use APIs for creating and managing user accounts. ASP. NET 1.x introduces form authentication on a large scale, but requires you to write a

In programs, we often define constants to identify some States and types. For example, to define the order status, you can define order_status_cancel = 1 to indicate that the order status is "the order has been canceled ". However, I feel that the

Classes and Inheritance class Declaring a class using the keyword class in Kotlin Class Invoice { } A class declaration consists of a class name, a class header (specifying its type parameter, a main constructor, and so on) and a class body

Java 5 new features enumeration, Java 5 new features1. Concept First, enumeration is not a new technology, but a basic data type. It belongs to the value types of the two basic types, as shown below: 　　 2. Why does enumeration exist? Enumeration

Java enum enumeration usage 1. Background: Before JDK1.5, we define constants as follows: public static final String RED = "RED "; When the enumeration type is added to JDK, We can group related constants into one enumeration class: public enum

(1) Static importThe import technology is actually in Java for the convenience of using other people to write good classes.Import java.lang.*| class nameOnly classes can be imported in the original Guide package statement. If you need to import some

1. Concept First, enumerations are not a new technology, but an underlying data type. It is subordinate to the value types in the two underlying types, as follows:　　 2. Why should there be enumeration Enumerations are very common in real development,

The previous article has translated the Hashtable source code top annotation, this article will explain in detail Hashtable each method realization. Hashtable Hierarchy Chart Let's look at the definition of Hashtable: public class Hashtable extends

I wrote an article about the powerful enumeration feature a few days ago. A few of my friends told me that it is not intuitive to simply describe the case. Indeed, I am writing a case Article here to explain the previous article. In this case, the

Java enum enumeration usage, javaenum Enumeration 1. Background: Before JDK1.5, we define constants as follows: public static final String RED = "RED "; When the enumeration type is added to JDK, We can group related constants into one enumeration

Through the previous few posts. We analyzed the AUI cache, the tool class, the display and loading of the code. Today, we continue to study the source code of AUI, the core Auxiliary tool class in learning.I hope you can learn something in it,

Why use enumerations?For example, to define the day of the week, some people with 1-7, and some with 0-6, which can easily lead to the emergence of problemsEnumeration is to let the value of a variable of a type can only be one of several values,

1. EnumerationEnum creation: Enum enum name {}Role of enumeration: limit the range of valuesAttributes of the enumeration:1, enumeration is a special class. Abstract class2. Each enumerated value declared in an enumeration class represents an

1, enumeration is a special class.2. Enumeration uses the Enum keyword adornment, which inherits the Java.lang.Enum class instead of the Java.lang.Objuct class by default.3. The constructor of the enumeration class can only be decorated with the

1. Defining classesclass class Name { 0 to multiple constructor definitions ... 0 to multiple member variables ... 0 to multiple methods ...}1.1 Defining constructors[modifier] Constructor Name (parameter list ) {// constructor name

Enumeration features 1. Defining an enumeration class with an enum inherits the Java.lang.Enum class by default, rather than inheriting the object class. Where the Java.lang.Enum class implements the Java.lang.Serializable and java.lang.Comparable

Directory Objective Source File Basics source file Structure Format Naming conventions Programming practices Javadoc Postscript ObjectiveThis document is a complete definition of the Google Java Programming

Java-Enumeration ClassesDefined:Used to value values within a range.Grammar:　　Enum Enum class Name {object instance, object instance ... ；}Characteristics:1, is a special form of Java class.2. Each enumeration value represents an instance object in

Google Java Programming style guideObjectiveThis document is a complete definition of the Google Java Programming style specification. When and only if a Java source file conforms to the rules in this document, we think it conforms to Google's Java