java enum class example

Usage One: ConstantsBefore JDK1.5, we defined constants: public static fianl ..... Now, with enumerations, you can group related constants into an enumeration type, and enumerations provide more methods than constants.public enum Color { RED, GREEN, BLANK, YELLOW Usage Two: SwitchThe switch statement before JDK1.6 only supports int,char,enum types, and using enumerations can make our code more readable.

1. Application of Enum, including definition, traversal, switch, enumset, enummap, etc. Import Java. util. enummap; import Java. util. enumset; public class enumtest {// defines an Enum Enumeration type, including two instances on, off public

Original URL: http://blog.csdn.net/wgw335363240/article/details/6359614Java enum-type enum useWhen I recently discussed the issue with my colleagues, my colleague suddenly mentioned why the constant values defined in Java do not take the ENMU enumeration type and are defined by the public final static type. We used to be defined in this way, rarely using the

Java compressed file tool class ZipUtil usage code example, tool class ziputil This example uses the Java Zip input/output stream to compress and decompress files. The first part of the code is used to obtain the file path and cha

) {System.out.println (Color.RED.toString ()); }}Usage Five: Implement InterfaceAll enumerations are inherited from the Java.lang.Enum class. Because Java does not support multiple inheritance, enumeration objects can no longer inherit from other classes. Public InterfaceBehaviour {voidprint (); String GetInfo (); } Public enumColorImplementsbehaviour {RED ("Red", 1), Green ("green", 2), BLANK ("Whit

public static Hr.test.Color valueOf (java.lang.String arg0); } The following is a detailed description of the characteristics and usages of enum classes defined by the enum. (color example is used later)1, the Color enumeration class is class, and is a final

Java Enumeration type enumEnumeration syntax1. Enum is called enumeration, which is commonly known as enumeration class in Chinese. People who have studied C/C ++ or other languages should have a slight knowledge of it.But it is introduced in the Java language specification in JDK 5 and stored in the

Example: publicenumEnumTest{ FRANK("Thegivennameofme"), LIU("Thefamilynameofme"); privateStringcontext; privateStringgetContext(){ returnthis.context; } privateEnumTest(Stringcontext){ this.context=context; } publicstaticvoidmain(String[]args){ for(EnumTestname:EnumTest.values()){ System.out.println(name+":"+name.getContext()); } System.out.println(EnumTest.FRANK.getDeclaringClass()); } }

This article mainly introduces the Enum (enumeration) usage in PHP, and analyzes in detail the implementation and use of Enum (enumeration) in php based on the instance form, which has some reference value, for more information about how to use Enum in PHP, see the following example. We will share this with you for you

Recently read the source code of the Hadoop#yarn section. Read to the state machine that part of the time, feel the use of ENMU is too flexible, in the concurrent programming network to translate an article, just met an article. Quickly translate down, rise posture.Original link: http://www.javacodegeeks.com/2011/07/java-secret-using-enum-to-build-state.htmlPeter Lawrey Translator: Chen ZhenyangReviewThe

Tips"Effective Java, third Edition" an English version has been published, the second edition of this book presumably many people have read, known as one of the four major Java books, but the second edition of 2009 published, to now nearly 8 years, but with Java 6, 7, 8, and even 9 of the release, the Java language has

There's something new in the enumeration class in Kotlin: The constant of an enumeration class can be seen as an anonymous class with the same name.Since it is a class, it can be associated with a methodCheck the code of the official websiteIf you have experienced the use of enumerations in other languages, you may be

This article mainly introduces the Enum (enumeration) usage in PHP, and analyzes in detail the implementation and use of Enum (enumeration) in php based on the instance form, which has some reference value, for more information about how to use Enum in PHP, see the following example. We will share this with you for you

======= subclasses are instantiated by default when the parent class is empty, the constructor is super (), which can be omitted.However, when the parent class does not have an empty construction method, it must call this method in the subclass to instantiate the parent class before the instance class is real.The defau