java enum valueof

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.

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

returns the difference in order of the two enumeration values. Of course, the premise is that two enumeration values must belong to the same enumeration class, otherwise a classcastexception () exception will be thrown. (Visible source code)Color.RED.compareTo (Color.Blue); return result-1(3) The values () method: A static method that returns an array that contains all the enumeration values.Color[] Colors=color.values ();for (Color c:colors) {System.out.print (c+ ",");}//return Result: Red,blu

using the ToString () method.valueOf () is a static method defined in the enum that returns the corresponding enum instance based on the given name, and throws an exception if no instance of the given name exists.Java enumeration (enum) 7 common usesJDK1.5 introduces a new type--enumeration. In Java, although it is a

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 enumerations:Class enumbyclass{public static final int red=0; public static final int green=1; public static final int blue=2;}An enumeration implemented in this way is also called an int enumeration pat

Java's Enum Enumeration type has finally appeared in j2se1.5. I thought it was just a chicken rib, but it was dispensable. After all, have you ever had a good life without it for so many years? Today, I read thinking in Java 4th edition, which contains a saying: "Sometimes it is precisely because of it that you can" elegantly and cleanly "solve the problem. Elegance and clarity are important. They formally

Java Development often uses a limited number of constants, which can be defined within the bean as an enum type, so in the maintenance of more convenient to control, so here is a simple record of the definition and usage of enum, convenient for future direct reference use, lazy people plan, hehe ... OK, just look at the code ... 1,

Package COM. XX. tests; import Java. util. hashmap; import Java. util. map; Public Enum season {spring {@ overridepublic string tostring () {return "Spring" ;}}, summer {@ overridepublic string tostring () {return "Summer ";}}, autumn {@ overridepublic string tostring () {return "Autumn" ;}}, winter {@ overridepublic string tostring () {return "Winter ";}}; priva

Enumerations are new features introduced in JDK 1.5 and are stored in the Java.lang package. It is straightforward to define a final string before you have an enumeration, which you can define directly after enumeration, but in Java you need a custom transformation to write your own method for the requirements. In the system used in the code below, need to be able to adopt their own, just simple to use. Public enumOrderstep {Pending review (1), pendin

Reprint: Java Enumeration (enum) detailed 7 common usagehttp://blog.csdn.net/qq_27093465/article/details/52180865 JDK1.5 introduces a new type--enumeration. In Java it is a "small" function, but to my development has brought "big" convenience. usage One: Constantsusage two: switchusage Three: Add a new method to the enumerationUsage Six: Organize enumerations usi

For: Enum Color {Red,blue,black Yellow,green}; (1) ordinal () method: Returns the order of enumerated values in the enumeration class. This order depends on the order in which the enumeration values are declared.Color.RED.ordinal (); Return Result: 0Color.BLUE.ordinal (); return Result: 1(2) CompareTo () method: An enum implements the Java.lang.Comparable interface, so it can be compared to the order of th

Enum An enum is a concept introduced by jdk1.5. The value of the enum type is actually represented by the object constructed at run time. When defining an enum, the compiler will do something for us by default: All enum classes inherit the

An introduction to the type of Enum The enumeration type (enumerated type) appears early in the programming language and is used to include a similar set of values into one type. The name of this enumeration type is defined as a unique type descriptor, which is similar to the definition of a constant. However, compared to a constant type, an enumeration type can provide a larger range of values for the declared variable. For example, if you want to

Features of Enum in Java 5:1. Enum is a class;2. Enum is final and cannot be inherited, and the value cannot be overwritten;3. You can use "=" and "equals ()" to compare enum;Enum before Java