1. Tiger enums.... coderanch.comEnums are, in terms of usage, a third construct, in addition to classes and interfaces. At an implementation level, that's not quite true -- but at an implementation level, an interface is treated as a class as well, so this is nothing new to Java folks. In terms of what I cover, I treat Enums pretty thoroughly. It was actually the ... |
2. looking for a flag-system with enums coderanch.comhello in the project i'm currently working on, we use a flag-mechanism to set and retrieve some properties. here's an example of the code: public class UsingFlags { public static final int FIRST_AREA = 0x01; public static final int NEW_AREA = 0x02; public static final int LAST_AREA= 0x04; // and so on... public int flags; // Contains some set of flags ... |
3. Trouble assigning enum keys to EnumMap in Java 5.0 coderanch.comHere is the code snippet: File: DirProc.java ----------------------- public class DirProc { public enum DIRECTION { X, Y}; // Other methods and variables as well } File: Test.java -------------------- import static DirProc.DIRECTION; public class Test { private Map< DIRECTION, String > myDirMap = new EnumMap< DIRECTION , String> ( DIRECTION.class ); // COMPILER ERROR HERE } -----> Compiler error: "Test.java": type ... |
4. BJO - enum - what special to OO ???? coderanch.comOriginally posted by rathi ji: Hi Jacquie, You were talking about enum in 'OO advantage of Java 5' post. Really, first time I understand the need of enum. But where OO comes into picture. I mean why the title was 'OO advantage of Java 5'?? Please comment on this.. Thanks a lot. I was a bit loose with my ... |
5. Enum substitute in Jdk1.4 coderanch.comI used Enums in my program I was compiling under JDK1.5. Now I need to go back and compile the same program under JDK1.4. Is there any library I can download for JDk1.4 for getting enums to work. I know that for there are concurrent which simulate JDK1.5 behaviour in JDk1.4 but any similar solution for enums without actually making code ... |
6. enum in Java 1.4.2? coderanch.comHi, I have the following code given to me by an instructor: public Interface Enumeration Language { English, German, Japanese, French, Klingon, NoKnownLanguage } Everytime I try to compile it, I get an error saying it is expecting a class or interface. The name of the file is Language.java and I am compiling using J2SDK 1.4.2_06 and I also tried 1.4.2_09. ... |
7. Enum coderanch.com |
8. Enums (Is this the best way)? coderanch.comI am still pretty new to Java and programming in general. But, it is getting to be much more fun lately. What's with the desire to work longer hours when you code? Let me give a little background on my question. After creating a whole slew of methods to check several arrays against each other and themselves in order to make ... |
9. enum coderanch.comenum CoffeeSize{ BIG(8), HUGE(10), OVERWHELMING(16); CoffeeSize(int ounce){ this.ounce = ounce; } private int ounce; public int getOunces(){ return ounce; } } class EnumTest { static CoffeeSize size ; size = CoffeeSize.BIG; public static void main(String []args){ // size = CoffeeSize.BIG; } } if I assign size after line static CoffeeSize size ; I got a complier error "EnumTest.java": |
10. How use Enum in Java 6.0 coderanch.comI am not able to use enum in java 6.0. The following is the code but it gives error. please any body can guide me why it is giving error. The error is enum is a keyword and not be used as identifier....Any body can help me why is this error public class EnumTest { public enum MainMenu {FILE, EDIT, FORMAT, ... |
11. Weird enum coderanch.com |
12. Enum in java 1.4 coderanch.comI'm not sure how a Chain of Responsibility would fit here. But you could use a Command pattern, and put the commands in a map. Here's a quick example: import java.util.Map; import java.util.HashMap; public class Test { private interface Command { void execute(); } private static final Map |
13. enum's injava coderanch.comthe java file CreditCardtest.java is type safe sol class CreditCardTest { public static void main(String[] args) { String creditCard=args[0].toUpperCase(); if(creditCard.equals(AllowedCreditCard.VISA.getname())) { System.out.println("yourcreditcard"+creditCard+"is accpeted."); }else if(creditCard.equals(AllowedCreditCard.MASTERCARD.getname())) { System.out.println("yourcreditcard"+creditCard+"is accpeted."); }else if(creditCard.equals(AllowedCreditCard.AMERICANEXPRESS.getname())) { System.out.println("yourcreditcard"+creditCard+"is accpeted."); }else { System.out.println("cc not valid for acceptance"+args[0]+"at this point of time"); } } } class AllowedCreditCard { protected final String card; public final static AllowedCreditCard VISA=new AllowedCreditCard("VISA"); public ... |
14. enum coderanch.comI'm not sure if this is what you meant, but if you're referring to the fact that the default implementation of Enum.toString() returns the name of the constant itself, then that doesn't really help me. The example I've shown above is a simplified version of my actual enum type. In the real version it would not be appropriate to name give ... |
15. Enum coderanch.com |
16. Enum doubt coderanch.com |
17. Question related to Enum coderanch.comHi , I have 2 questions related to following code 1. How can I access sum(int a , int b) method from main() method? 2. Why I can't make sum method static? class EnumTest { static enum test { FIRSTCLASS("This is First Class") { String performance() { return "nisha"; } // Can we add methods like this in one particular enum ... |
18. Doubt About Enum in java 1,5 coderanch.com |
19. Enums coderanch.comHere's one example. public enum SEX { MALE, FEMALE } If you use this enum, your data will for sure contain only one of those 2 possible values. If you use String instead of enum, like String SEX; you will have possibility of mistakenly putting 'SHE-MALE' on it (not that there is no such this in reality), but your system is ... |
20. Enum useage question coderanch.comI have a situation where I pass a constant to a constructor. I want to use an Enum, but I am not quite sure how to. My code looks something like this: public class KeyPressedBehavior { public final static String ENTER_KEY = "13"; public final static String ZERO_KEY = "48"; public final static String ONE_KEY = "49"; public final static String ... |
21. eliminating duplicate Enum code coderanch.com/** * Enumeration of Electronic Address type */ public enum ElectronicAddressEnum implements CodableEnum { MSN_MESSENGER("msn_messenger"), GOOGLE_TALK("google_talk"), SKYPE("skype"), YAHOO_MESSENGER("yahoo_messenger"); private final String code; ElectronicAddressEnum(String code) { this.code = code; } public String getCode() { return code; } public ElectronicAddressEnum getByCode(String code) { for (ElectronicAddressEnum e : ElectronicAddressEnum.values()) { if (e.getCode().equalsIgnoreCase(code)) { return e; } } } } |
22. Strange Enum behaviour? coderanch.comWhat happens in this (rather stupid) sample? It looks like the static variable Enum.next is not initialised when the Enum are and therefore their member variable value is initialised with values from 0 to 2 (instead of 'a' to 'c' as one might think). The output is at least: a 0 1 2 a And the code looks like: public class ... |
23. What is the difference between enum and Enum? coderanch.comIndeed, Also if I'm not mistaken, "enum" was not a reserved keyword until Java 1.5. I've worked with system that have code written in older version of Java, that uses 'enum' as a variable name everywhere. Bad idea as the moment you roll 1.5 in, the code doesn't compile due to the enum errors. If you are updating/ writing code using ... |
24. Enums coderanch.com |
25. understanding J2SE 5.0 Enum coderanch.comI'm coming from the C# world where I can write an enumerated type like so: public final enum QueryType { STORED_PROCEDURE, RAW_STATEMENT } ...and then call it from another class like so, and it would work: if (paramQuerytype == QueryType.STORED_PROCEDURE) return true; However, I get an error (Eclipse) telling me "QueryType.STORED_PROCEDURE cannot be resolved". Code-hinting reveals that I all have available ... |
26. Understanding enum coderanch.com |
27. Enum problem/error coderanch.comSitting for SCJA tomorrow and I'm reviewing enum and trying to get the code from the java tutorial at sun to compile but i get an error at line 43 of "symbol not found". Any ideas? public class EnumTest { public enum Planet { MERCURY (3.303e+23, 2.4397e6), VENUS (4.869e+24, 6.0518e6), EARTH (5.976e+24, 6.37814e6), MARS (6.421e+23, 3.3972e6), JUPITER (1.9e+27, 7.1492e7), SATURN (5.688e+26, ... |
28. String to Enum coderanch.comimport java.util.*; import java.io.*; enum OperatingSystems { windows, unix, linux, macintosh } public class EnumExample1 { public static void main(String args[]) { OperatingSystems os; System.out.println("Enter your choice"); BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); os = br.readLine(); // os = OperatingSystems.windows; switch(os) { case windows: System.out.println("You chose Windows!"); break; case unix: System.out.println("You chose Unix!"); break; case linux: System.out.println("You chose Linux!"); break; case ... |
29. ENUM'S coderanch.comThe soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - ... |
30. what is a ENUM coderanch.com |
31. about enum coderanch.com |
32. Confusion on enum selection coderanch.comI cannot understand how the EARH has been selected in the first output of the main. I have 2 earth but by the first one is selected even if 2 are available. What is the rule for the selection of a variable? public enum Planet {EARTH(1.00e+1, 1.0e1), MERCURY(2.2e+22, 2.2e2); private final double mass; private final double radius; Planet(double mass, double radius) ... |
33. about enum coderanch.comThe soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - ... |
34. How use Enum in java 6.o coderanch.com |
35. question on enums coderanch.comI'm studying for my SCJP Exam an i have a question concerning enums and static fields: I tried to increment a static variable from an enum-constructor. It doesn't compile. Look at the code: enum BeerSize { SMALL(300), MEDIUM(500), BIG(1000); private int volume; private static int sizeCount=0; BeerSize(int vol) { sizeCount++; // this doesn't compile this.volume = vol; } public void setSize(int ... |
36. Anybody know how to use "enum" in Java? coderanch.comThe soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - ... |
37. enum question coderanch.comA "variable length enum"? Do you mean you want to add constants to the enum at runtime? I guess you have a database table that contains a list of constants and you want to make an enum out of this at runtime? If that's what you mean then no, you can't do this with enums and that's not what enums are ... |
38. Enum question coderanch.comYes, I can see it. I think something is wrong if I cannot use the language simply by looking up the API documentation. Where has the good ole Java gone. Something comprehensible like C++ only portable. Since the 1.5 it's not what it used to be. Mainly due to the generics thing. A language should be a productive tool. Not something ... |
39. enums and protected modifier coderanch.comThe soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - ... |
40. about enum coderanch.com |
41. Enum can not be subclassed coderanch.comHi, The thing is i understand why they have done it, but its the way they have done it is difficult to digest. Like declaring a class abstract and still not allowing it to be subclassed is certainly not the java way of doing something. There could have been away in language itself to prevent this from subclassed...I am just trying ... |
42. Enums and access coderanch.comYour code runs and compiles fine, but the reason is that the enum class has now default access. So you can only use it within your package. If you want to use your enum outside your package. You must mark your enum public and this will give a compile error because in Java you can have only one public class in ... |
43. Enum Issue coderanch.comThe soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - ... |
44. is enum specific to Java 5? coderanch.com |
45. enum used in a code coderanch.com |
46. About Enum coderanch.comHowdy BTR, you can use import to import the enum per se or you can use import static to also import the fields of the enum. For example if you have package resources; public enum Animal { DOG(4), CAT(4), BIRD(2), SNAKE(0); private int legs; Animal(int legs) { this.legs = legs; } @Override public String toString() { return super.toString() + " (" ... |
47. Enum coderanch.comDo you mean enums or the Enum class. There is a class called Enum which is rather like Object in that it is the superclass of all enums. It has about two methods which are not in Object, and a constructor which you are not able to use. Look it up in the API specification. There is a thing called an ... |
48. How to imlement Abstract factory using enum? coderanch.comI have a combo box (SWT.DROP_DOWN) and I want to use it to implement the abstract factory or factory method pattern. Presently I have created some enums and associate the enumeration values with strings via the combo box (see below). The combo box contains instances of the following enum: public enum ParserType {NEKO{int getIndex(){return 0;}},JTIDY{int getIndex(){return 1;}}} ; private ParserType m_ParserType ... |
49. what is Enum coderanch.comHi all CAn anyone explain about "Enum" in ?.I read some some article but i could not get the correct point. 2) I like to have a varialbe which contain 4 or 5 element ,at runtime i will give value for this variable,For example variable loom ,it has elements color,manufacture,....).PLease explain ,how can i create variable which has many elements |
50. Iteration on Enum coderanch.comHi, 1. Please confirm how we can iterate on Enum values()through general for/while loops. 2. I'm able to use values() method on Enum though as per Javadoc Enum class do not have such method. 3. Which all operators/operations can be performed on instance of Enum. Personal Experience: Its difficult to search the Javaranch for any existing posts as (may be) search ... |
51. enum syntax coderanch.com |
52. what are Enums? coderanch.com |
53. Enum Help ! coderanch.comenum translateSpanish{ HELLO("Hola"), BYE("Chau"); String responce; // what is doing here [B]Declaring a String attribute[/B] translateSpanish(String get){ responce = get; //what is doing here [B]assigning one reference to another[/B] } } class testEnum{ static translateSpanish ts; //can you call a class using static ? // [B]it's declaring an static attribute of enum type translateSpanish[/B] public static void main(String[] args){ System.out.println(ts.HELLO.responce); //why ... |
54. About Enum coderanch.com |
55. Enums in 1.4 coderanch.comGiven the following enum: public enum Card { DEUCE, THREE, FOUR, FIVE } The following comes closest to recreating these: public final class Card { public static final Card DEUCE = new Card("DEUCE", 0); public static final Card THREE = new Card("THREE", 1); public static final Card FOUR = new Card("FOUR", 2); public static final Card FIVE = new Card("FIVE", 3); ... |
56. Using multiple enum coderanch.comGiven two enum types (fruit and veg), and an input. How do you find out the enum type from the input? Here is code for example (the code obviously doesn't work): public enum fruit{APPLE,ORANGE} public enum veg{CABBAGE,CARROT} public static void main(String[] arg){ switch(receiveInput()){ case(fruit): processFruit(); case(veg): proceesVeg(); } } public Object receiveInput(){ //READ FROM A SOURCE, SOURCE INPUTS IN THIS INSTANCE: ... |
57. what enums of java 1.5 coderanch.com |
58. learning java - today: enums coderanch.comHi, I'm trying tolearn java, didn't even know it was a prog language 5 days ago - so bare with me. I have a boolean array, let's call it when: boolean[] when = new boolean[7]; I have an enum that looks kinda like this: enum weekday { mon("Mondays suck!"), tue("Tuesdays suck, too!"), ... sun("Sundays don't suck so much."); { private final ... |
59. doubt in enum coderanch.com |
60. Enum question coderanch.comenum member names have to be valid Java identifiers; you can't use the "dash" character. You can always just use "if (s.equals("font-weight"))... else if (s.equals("rowspan"))..." . Or if you have a large number of keywords, use a Map with the keywords as the keys, and "action objects" as the values -- i.e., objects that all implement a simple interface like Runnable ... |
61. Should I be using Enums? coderanch.comShould I be using enums to make this method cleaner? If so can someone pleeeease show me a good way to do it? Thanks a lot! private int getNextHeader(int a) { int bitrate = 0; int samplerate = 0; int padding = 0; String v = Integer.toBinaryString(a); while (v.length() < 8) { //pad with 0's v = "0" + v; } ... |
62. Enum RetentionPolicy coderanch.comWith @Retention(RetentionPolicy.RUNTIME), the annotation is preserved during runtime, and can be retrieved using reflection. You could use this for instance for testing purposes. Suppose you have an annotation called @Test that indicates a method is a test method. Then you could write an automatic testing tool: // give a class c Method[] methods = c.getMethods(); for (Method method: methods) { boolean ... |
63. from Enum coderanch.comI decompiled that class using JAD, and this is the output: public final class CheckEnum extends Enum { public static CheckEnum[] values() { return (CheckEnum[])$VALUES.clone(); } public static CheckEnum valueOf(String s) { return (CheckEnum)Enum.valueOf(CheckEnum, s); } private CheckEnum(String s, int i) { super(s, i); } private static final CheckEnum $VALUES[] = new CheckEnum[0]; }I can match valueOf and values, so that ... |
64. Enum Naming Convention coderanch.comHi I have written an enum, FileExtensions which contains some file extensions , I have two ways to write this each extension names, One way just specifying the lower case Ex. enum FileExtensions { ppt, xls; } in this case I just have to get that enum and which will server my purpose, i.e. appending this enum name to file name. ... |
65. Determing which enum from request.getParameter("sortBy"); coderanch.com |
66. Importing enums coderanch.comThanks Ritchie and Jesper for a quick reply. Whether Result is 'public static final': What do you mean exactly? It's public, because you specified that yourself in your code. It's not static, because top-level classes (and enums) cannot be static. You can regard it as being final, because you cannot extend an enum (you cannot create a subclass using an enum ... |
67. where we use enums coderanch.comIf you have constants that are not likely to change in the future, you would use an enum. Imagine a card example. The suit of a card will always be either HEART, DIAMOND, SPADES or CLUB. This is a perfect scenario for using an enum. The real power of enums can be leveraged when using it's constructor capability and generating methods ... |
68. reflexion and enum coderanch.com |
69. when to use Enum coderanch.com |
70. Enums coderanch.com |
71. simple enum doubt? coderanch.comclass Coffee2 { enum CoffeeSize {BIG,HUGE,OVERWHELMING} CoffeeSize size; } public class CoffeeTest2 { public static void main(String args[]) { Coffee2 drink=new Coffee2(); drink.size=coffee2.CoffeeSize.BIG // now how come coffee2.CoffeeSize.Big is used despite enum is not declared static??? } } class Coffee2 { enum CoffeeSize {BIG,HUGE,OVERWHELMING} CoffeeSize size; } public class CoffeeTest2 { public static void main(String args[]) { Coffee2 drink=new Coffee2(); drink.size=coffee2.CoffeeSize.BIG ... |
72. What is typeSafe enum ? coderanch.com |
73. Enum coderanch.com |
74. Enum vs Long coderanch.comUsing an enum is more type safe. In a long, you can store any value that fits into the long. It's easy to make a mistake and store a value that has no meaning in your application. An enum can only take valid values. If you need to store and retrieve the data to and from an external system (for example ... |
75. doubts in enum and generalized code coderanch.comhi i am not unable to understand the below code which uses enum with generalized code can anybody please make me understand the below code? List |
76. Defining / Understanding anatomy of Enum coderanch.com |
77. sharing enum contants coderanch.comMy problem is that I want to share enum constants throughout my program. All of the articles I've read on enums talk about HOW to write them from a syntax point of view, but not WHERE to write them. For example, should I include the enum definition in a class file? In their own file? What if I want the enum ... |
78. enums coderanch.comAn enum type is a type whose fields consist of a fixed set of constants. Common examples include compass directions (values of NORTH, SOUTH, EAST, and WEST) and the days of the week. Because they are constants, the names of an enum type's fields are in uppercase letters. The above is the definition of enum as given in Sun Doc, basically ... |
79. One simple enum question (from HF Java) coderanch.comA switch will use the first case it matches, and then every case after that one, unless it encounters a break command. So this code would jump to PHIL, output "go deep ", then continue on to BOBBY and output "cassidy!". If you wanted it to print only the line belonging to the case, you would have to put a "break;" ... |
80. Enums : Is it a useless wonder ? coderanch.comI am in java development from long time and also in java 1.5 from more than 3 years. Recently in a seminar i saw people are using java enums, that day i realized i never used enums in my code(projects) . i told same to my friend and he answered me, "enum is a useless wonder !" I said, come on ... |
81. Enums coderanch.comHi All! I have some enums in my code: public enum Days { SUNDAY, MONDAY, TUESDAY, WEDNSDAY, THURSDAY, FRIDAY, SATURDAY; } public enum Months{ JAN, FEB, MAr, APR, MAY, JUN, JUL, AUG, SEP, OCT, NOV, DEC; } I want to be able to retrieve the enum, JUN for example, by it's ordinal, 5. So, i created a static method, inside Month: ... |
82. Issues With Enum coderanch.comHello I have a ten enum. One of them is as below: public enum Type { TYPEA,TYPEB; } And for the ten enum classes I have ten other classes in which each of one used. One of them is as below : public class ClassB extends ClassA { public ClassB() { } // Should return Type enum @Override protected Enum getEnumName() ... |
83. Including "+" sign in Enum coderanch.comHi, I have an enum that represents blood group. Allowable values are (A+, A- , B+, B-, AB+, AB-, O+, O-). The problem is that I am not able to define the enum because of the special character "+". I tried to escape it using A\+, but that doesn't work. Also tried to put the values in quotes (single and double) ... |
84. shifting to the next enum in the list coderanch.comIs there a way to create a method within an enum that will shift the value of the enum variable to the next enum value. What I have so far is a method that lets me change the value manually (so to speak). What I want to accomplish is a method that lets me do something like: day = test.MON; day.next(); ... |
85. why Enum is declared abstract coderanch.comfrom the API: This is the common base class of all Java language enumeration types. It is a base class which defines among other things a base Type, but it has no meaning on its own and hence requires a class to extend it to provide a real purpose. An abstract class doesn't have to include abstract methods, it is just ... |
86. Question about enums and enhanced for coderanch.com |
87. Use of enum coderanch.comFirst of all I would change the enums to make the 0/1 part a property of the enum: public enum DealType { BOOKING(0), CANCELLATION(1); private final int value; private DealType(int value) { this.value = value; } @Override public String toString() { return String.valueOf(value); } } You'll now need a mapping from 0/1 to the enum values. You can do this in ... |
88. Enum coderanch.comOK got it, Here is where I am now. Why do I get an incompatible type error on lines 32 and 33. And how can I make it so it assigns the value it pulls from the string to my enum? import java.util.Scanner; import java.util.Random; public class CardGuess { public enum Suit{CLUBS,HEARTS,DIAMONDS,SPADES} public enum Value{ACE,TWO,THREE,FOUR,FIVE,SIX,SEVEN,EIGHT,NINE,TEN,JACK,QUEEN,KING} private Suit guessedSuit; private Value guessedValue; ... |
89. Ugly Enum Code. Please help make it more proper coderanch.comHello again guys! I have a question on enums. First, the code: enum ChowderChars { CHOWDER("Food!"), MUNG_DAAL("Feedle Deedle!"), SHNITZEL("Radda Radda!"), TRUFFLES("What's going on!"), GIZPACHIO("Mom!") { public String SayIt(String origCP) { return origCP + " What the? "; } /*public String SayIt() { return catchphrase + " What the? "; }*/ public String SayItRather() { return "Will it work?"; } }; ChowderChars(String ... |
90. enum coderanch.comthis is very simple example in enum: public enum Day { SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY } public class EnumTest { Day day; public EnumTest(Day day) { this.day = day; } public void tellItLikeItIs() { switch (day) { case MONDAY: System.out.println("Mondays are bad."); break; case FRIDAY: System.out.println("Fridays are better."); break; case SATURDAY: case SUNDAY: System.out.println("Weekends are best."); break; default: ... |
91. refactoring enums coderanch.comGreetings all, I have a class that contains a passel of enums. Currently every enum contains the method isAllColumnNamesCorrectInFirstRow, identical except for referencing its own enum explicity within itself within enum EenumA, public static boolean isAllColumnNamesCorrectInFirstRow( String[] str_arry) { boolean out_bool = true; for( EenumA rr : EdnumA.values() ) { if( !rr.getFieldName().equals(str_arry[ii])) { out_bool = false; break; } ii++; } return ... |
92. ENUM example :I need solution about enum program coderanch.comWelcome to the Ranch! Here at JavaRanch, we want to help people to learn Java. We don't write a complete program for you, because that will not teach you to write programs in Java yourself. So, please try writing some code yourself for this assignment first. Do you know how to program with enums in Java? If not, then you can ... |
93. Enums and size coderanch.comI have a few questions about enum size when it come to declarations. 1: If I declare an enum in a class that will be instantiated multiple times, will that be reflected in memory? Example 1: public class foo{ public enum bar{a,b,c} ... } will a,b,c take up storage in each instance? IE multiple copies of the enum. what if it's ... |
94. Instantiating an enum coderanch.comHi Folks, Is it possible to instantiate an enum? I have the following enum in a stand alone file, as in it's not part of of another class: FileName: CustomerType.java public enum CustomerType { RETAIL, TRADE, COLLEGE; public String toString(String cType) { String s = cType; if (s.equalsIgnoreCase("RETAIL") ){ s = "Retail Customer"; } else if (s.equalsIgnoreCase ("TRADE")) { s = ... |
95. What is Enum? coderanch.com |
96. modifying enums coderanch.compublic final class EnumLabels { private static final Properties PROPERTIES = new Properties(); static { // load the contents of the file here } private EnumLabels() { // private constructor to prevent initialization } public static String getLabel(Enum enum) { return PROPERTIES.getProperty(enum.name(), enum.name()); // default to enum.name() if not found } } |
97. enum concept coderanch.com |
98. How do I easilt check if a string is inside a enum? java-forums.orgpublic enum type {One, Two, Three} public static boolean inEnumType(String name) { try { type.valueOf(name); return true; } catch(Exception e) { return false; } } ... public static void main(String[] args) { System.out.println("One exists: " + inEnumType("One")); System.out.println("Two exists: " + inEnumType("Two")); System.out.println("Three exists: " + inEnumType("Three")); System.out.println("Four exists: " + inEnumType("Four")); } |
99. enum java-forums.orgHello, I am playing with enums and can't figure out how to pass them into a contructor. I have a dog class with enum BREED{LAB, GOLDEN}; I would like to create a dog object from main using a constructor Dog(BREED breed) { itsBreed = breed; } In main, when I call Dog d1 = new Dog(LAB); I get the error that ... |
100. why we are using enums in Java? java-forums.orgHere is why enums are beeter than classic java constants: Java: Enums Think of it as special class definition which gives you power to represent set of data in easy manner and control and use is it easily. JosAH made good point about enforcing type safety in your code. Just define your special class as enum, add some entries and use ... |