Common ways to use Java enumerations

JDK1.5 introduces a new type-enumeration, and the advent of enumerations brings great convenience in everyday development.

Common Methods One: constants

JDK1.5 before we usually define system constants, basic is the public static final ... After the enumeration, we can say that enumerations are encapsulated in enumerations.

 Public enum Color {    Yellor,red,balck}

Common method Two: Switch

 Public classTest { Public Static voidMain (string[] args) {Light color=Light.green;    SYSTEM.OUT.PRINTLN (change (color)); }/*** Enumerate Switch * *@paramColor *@return     */    Private Staticstring Change (light color) {string Remind=NULL; Switch(color) { CaseRed:color=Light.green; Remind= "Red Stop";  Break;  CaseGreen:color=Light.green; Remind= "Green Line";  Break;  CaseYellor:color=Light.yellor; Remind= "Yellow light is on, wait.";  Break; default:                 Break; }        returnremind; }}

Common methods Three: enumeration traversal

enumLight {yellor, RED, GREEN} Public classTest { Public Static voidMain (string[] args) {enumiterator (); }    /*** Enumeration Traversal*/    Private Static voidEnumiterator () { for(Light light:Light.values ()) {if(Light.equals (Light.green)) {System.out.println ("Green Line"); } Else if(Light.equals (light.red)) {System.out.println ("Red Stop."); } Else if(Light.equals (Light.yellor)) {System.out.println ("Yellow light is on, wait."); }        }    }}

Common Method Four: Adding a new method to an enumeration class

 Public enumCountryicon {China ("China", "China.icon"), USA ("USA", "Usa.icon")),; PrivateString Country; PrivateString icon; PrivateCountryicon (String country, string icon) { This. Country =Country;  This. Icon =icon; }     PublicString getcountry () {returnCountry; }     Public voidSetcountry (String country) { This. Country =Country; }//Get the corresponding icon by entering a country name Public Staticstring GetIcon (String country) { for(Countryicon countryIcon:CountryICON.values ()) {if(Countryicon.getcountry (). Equals (country)) {returnCountryicon.icon; }        }        return NULL; }     Public voidSetIcon (String icon) { This. Icon =icon; }}

Common ways to use Java enumerations