How to convert enum value to int?
205
I have a function which return a type int. However, I only have a value of the TAX enumeration.
How can I cast the TAX enumeration value to an int?
public enum TAX {
NOTAX(0),SALESTAX(10),IMPORTEDTAX(5);
private int value;
private TAX(int value){
this.value = value;
}
}
TAX var = TAX.NOTAX; // This value will differ
public int getTaxValue()
{
// what do do here?
// return (int)var;
}
java enums
asked Nov 16 '11 at 19:50
vrbilgivrbilgi
2,423103051
add a comment |
205
I have a function which return a type int. However, I only have a value of the TAX enumeration.
How can I cast the TAX enumeration value to an int?
public enum TAX {
NOTAX(0),SALESTAX(10),IMPORTEDTAX(5);
private int value;
private TAX(int value){
this.value = value;
}
}
TAX var = TAX.NOTAX; // This value will differ
public int getTaxValue()
{
// what do do here?
// return (int)var;
}
java enums
asked Nov 16 '11 at 19:50
vrbilgivrbilgi
2,423103051
1
Possible duplicate of How to match int to enum
– malat
Nov 18 '16 at 13:38
add a comment |
205
205
205
36
I have a function which return a type int. However, I only have a value of the TAX enumeration.
How can I cast the TAX enumeration value to an int?
public enum TAX {
NOTAX(0),SALESTAX(10),IMPORTEDTAX(5);
private int value;
private TAX(int value){
this.value = value;
}
}
TAX var = TAX.NOTAX; // This value will differ
public int getTaxValue()
{
// what do do here?
// return (int)var;
}
java enums
asked Nov 16 '11 at 19:50
vrbilgivrbilgi
2,423103051
I have a function which return a type int. However, I only have a value of the TAX enumeration.
How can I cast the TAX enumeration value to an int?
public enum TAX {
NOTAX(0),SALESTAX(10),IMPORTEDTAX(5);
private int value;
private TAX(int value){
this.value = value;
}
}
TAX var = TAX.NOTAX; // This value will differ
public int getTaxValue()
{
// what do do here?
// return (int)var;
}
java enums
java enums
asked Nov 16 '11 at 19:50
vrbilgivrbilgi
2,423103051
asked Nov 16 '11 at 19:50
vrbilgivrbilgi
2,423103051
edited Nov 16 '11 at 19:53
user166390
asked Nov 16 '11 at 19:50
vrbilgivrbilgi
2,423103051
asked Nov 16 '11 at 19:50
vrbilgivrbilgi
2,423103051
asked Nov 16 '11 at 19:50
vrbilgivrbilgi
2,423103051
2,423103051
1
Possible duplicate of How to match int to enum
– malat
Nov 18 '16 at 13:38
add a comment |
1
Possible duplicate of How to match int to enum
– malat
Nov 18 '16 at 13:38
1
1
Possible duplicate of How to match int to enum
– malat
Nov 18 '16 at 13:38
Possible duplicate of How to match int to enum
– malat
Nov 18 '16 at 13:38
add a comment |
6 Answers
6
active
oldest
votes
311
You'd need to make the enum expose value somehow, e.g.
public enum Tax {
NONE(0), SALES(10), IMPORT(5);
private final int value;
private Tax(int value) {
this.value = value;
}
public int getValue() {
return value;
}
}
...
public int getTaxValue() {
Tax tax = Tax.NONE; // Or whatever
return tax.getValue();
}
(I've changed the names to be a bit more conventional and readable, btw.)
This is assuming you want the value assigned in the constructor. If that's not what you want, you'll need to give us more information.
answered Nov 16 '11 at 19:54
Jon SkeetJon Skeet
1089k69079488444
11
there is a better idea here stackoverflow.com/a/7996473/398348
– likejudo
Sep 10 '14 at 21:44
1
@likejiujitsu: That's going in the opposite direction. In this question, the OP already has a value of typeTax, and wants to get the numeric value from it.
– Jon Skeet
Sep 10 '14 at 22:34
I just tried it and realize it failsmyEnumValue = MyEnum.valueOf(myInt);the arg has to be of type String - or is there something I am missing?
– likejudo
Sep 10 '14 at 22:58
6
@likejiujitsu: Well it's irrelevant to this question...
– Jon Skeet
Sep 11 '14 at 0:13
This solution is worse than nothing. Seems enums in Java just shouldn't be used? Or has JDK 1.8 changed that?
– ebyrob
Nov 11 '16 at 16:10
|
show 1 more comment
187
I prefer this:
public enum Color {
White,
Green,
Blue,
Purple,
Orange,
Red
}
then:
//cast enum to int
int color = Color.Blue.ordinal();
answered Apr 11 '13 at 3:06
viviavivia
2,108197
30
This is incorrect/not recommended by Joshua Bloch in his book Effective Java (2nd ed). See item 31.
– user504342
Oct 13 '13 at 13:49
34
@user504342 I do not have the 2nd edition of the book so can you please give us the gist of why it is not recommended?
– likejudo
Sep 10 '14 at 20:25
14
2 reasons: one, any association between the ordinal values and the constants will break if new constants are added, and two the API docs specifically recommend against it.
– jordanpg
Oct 28 '14 at 3:26
6
So clean and perfect. I see a few "don't do it" and "not recommended". I'll have to research on why it's considered bad. Some of the bloated samples look bad IMO. So much work to do such a simple task.
– Herb Meehan
May 20 '16 at 18:38
3
In a team, you're pretty sure on of your co-developer will add a value in the middle (worse at the beginning), or just sort them because they have nothing to do and completely mess the code using.ordinal()
– Michael Laffargue
May 3 '17 at 13:47
|
show 1 more comment
17
If you want the value you are assigning in the constructor, you need to add a method in the enum definition to return that value.
If you want a unique number that represent the enum value, you can use ordinal().
answered Nov 16 '11 at 19:54
unholysamplerunholysampler
14k33662
2
Be careful. There are many more developmental anti-patterns that rely onordinal()than valid use cases forordinal(). If you need to store a unique value for theenum, then just store theenum. There are EnumSets, Lists of Enums, EnumMaps, and nearly any other Enum collection you might want available.
– Edwin Buck
Nov 16 '11 at 19:57
1
@EdwinBuck: That is good to point out, I just wanted to mention the existence ofordinal()because the OP didn't make it clear what he wanted the int to actually be.
– unholysampler
Nov 16 '11 at 20:01
Don't get ordinal. Please check the enum api regarding this. Up-vote removed.
– Hovercraft Full Of Eels
Nov 16 '11 at 20:22
3
I wonder what peoples' thoughts are about the use ofordinal()internally within the enum itself. For example, say I have an enum called "Season" which contains the valuesSpring,Summer,Autumn, andWinter, and it has a public method callednext()which returnsvalues()[(ordinal() + 1) % 4]Externally, no code ever sees the ordinal number, and there will never be additional members in this enum, so it seems like a valid use-case.
– Darrel Hoffman
Oct 29 '13 at 19:52
1
@DarrelHoffman My feeling is that doing that is fine, since the only strong arguments I see against usingordinal()hinge on far flung code being broken by changes to the enum enumeration constants. If you're going to modify the enum's constants you'd have to be in that file already. Most enums are fairly short, and if it's not you should be checking the file more thoroughly anyway. In both cases you should probably have a unit test covering yournext()method anyway.
– Alan Hensley
Jun 1 '16 at 16:26
add a comment |
11
Sometime some C# approach makes the life easier in Java world..:
class XLINK {
static final short PAYLOAD = 102, ACK = 103, PAYLOAD_AND_ACK = 104;
}
//Now is trivial to use it like a C# enum:
int rcv = XLINK.ACK;
answered Jan 10 '17 at 14:06
VladiVladi
18624
For me this is the most desirable way to go. I get the benefits of enum (code clarity), a data type that is DB friendly, and I don't have to research 100 enum alternatives to do it the "android way". Simple and effective.
– John Ward
Mar 1 '17 at 15:08
Nice. It's as if the java enum is just completely disconnected from the reality of what an enum is used for... especially if people then start abusing it for things like singletons. This approach does have the disadvantage it doesn't have an easy way to get all values though.
– Nyerguds
Sep 18 '18 at 9:01
Doesn't this have the disadvantage of trying to pass an enum value to a method? You can no longer pass a XLINK to a method, because it doesn't represent anything concrete. You lose the typing into your method. The method signature would have to read short instead of XLINK.
– Dustin Jensen
Dec 20 '18 at 4:03
add a comment |
2
Maybe it's better to use a String representation than an integer, because the String is still valid if values are added to the enum. You can use the enum's name() method to convert the enum value to a String an the enum's valueOf() method to create an enum representation from the String again. The following example shows how to convert the enum value to String and back (ValueType is an enum):
ValueType expected = ValueType.FLOAT;
String value = expected.name();
System.out.println("Name value: " + value);
ValueType actual = ValueType.valueOf(value);
if(expected.equals(actual)) System.out.println("Values are equal");
answered Apr 12 '17 at 17:45
MikeMike
2,699285
add a comment |
0
public enum Tax {
NONE(1), SALES(2), IMPORT(3);
private final int value;
private Tax(int value) {
this.value = value;
}
public String toString() {
return Integer.toString(value);
}
}
class Test {
System.out.println(Tax.NONE); //Just an example.
}
edited Nov 27 '18 at 12:17
deHaar
2,50851628
answered Nov 27 '18 at 11:59
Ieshaan SaxenaIeshaan Saxena
178
add a comment |
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6 Answers
6
active
oldest
votes
6 Answers
6
active
oldest
votes
active
oldest
votes
active
oldest
votes
311
You'd need to make the enum expose value somehow, e.g.
public enum Tax {
NONE(0), SALES(10), IMPORT(5);
private final int value;
private Tax(int value) {
this.value = value;
}
public int getValue() {
return value;
}
}
...
public int getTaxValue() {
Tax tax = Tax.NONE; // Or whatever
return tax.getValue();
}
(I've changed the names to be a bit more conventional and readable, btw.)
This is assuming you want the value assigned in the constructor. If that's not what you want, you'll need to give us more information.
answered Nov 16 '11 at 19:54
Jon SkeetJon Skeet
1089k69079488444
11
there is a better idea here stackoverflow.com/a/7996473/398348
– likejudo
Sep 10 '14 at 21:44
1
@likejiujitsu: That's going in the opposite direction. In this question, the OP already has a value of typeTax, and wants to get the numeric value from it.
– Jon Skeet
Sep 10 '14 at 22:34
I just tried it and realize it failsmyEnumValue = MyEnum.valueOf(myInt);the arg has to be of type String - or is there something I am missing?
– likejudo
Sep 10 '14 at 22:58
6
@likejiujitsu: Well it's irrelevant to this question...
– Jon Skeet
Sep 11 '14 at 0:13
This solution is worse than nothing. Seems enums in Java just shouldn't be used? Or has JDK 1.8 changed that?
– ebyrob
Nov 11 '16 at 16:10
|
show 1 more comment
311
You'd need to make the enum expose value somehow, e.g.
public enum Tax {
NONE(0), SALES(10), IMPORT(5);
private final int value;
private Tax(int value) {
this.value = value;
}
public int getValue() {
return value;
}
}
...
public int getTaxValue() {
Tax tax = Tax.NONE; // Or whatever
return tax.getValue();
}
(I've changed the names to be a bit more conventional and readable, btw.)
This is assuming you want the value assigned in the constructor. If that's not what you want, you'll need to give us more information.
answered Nov 16 '11 at 19:54
Jon SkeetJon Skeet
1089k69079488444
11
there is a better idea here stackoverflow.com/a/7996473/398348
– likejudo
Sep 10 '14 at 21:44
1
@likejiujitsu: That's going in the opposite direction. In this question, the OP already has a value of typeTax, and wants to get the numeric value from it.
– Jon Skeet
Sep 10 '14 at 22:34
I just tried it and realize it failsmyEnumValue = MyEnum.valueOf(myInt);the arg has to be of type String - or is there something I am missing?
– likejudo
Sep 10 '14 at 22:58
6
@likejiujitsu: Well it's irrelevant to this question...
– Jon Skeet
Sep 11 '14 at 0:13
This solution is worse than nothing. Seems enums in Java just shouldn't be used? Or has JDK 1.8 changed that?
– ebyrob
Nov 11 '16 at 16:10
|
show 1 more comment
311
311
311
You'd need to make the enum expose value somehow, e.g.
public enum Tax {
NONE(0), SALES(10), IMPORT(5);
private final int value;
private Tax(int value) {
this.value = value;
}
public int getValue() {
return value;
}
}
...
public int getTaxValue() {
Tax tax = Tax.NONE; // Or whatever
return tax.getValue();
}
(I've changed the names to be a bit more conventional and readable, btw.)
This is assuming you want the value assigned in the constructor. If that's not what you want, you'll need to give us more information.
answered Nov 16 '11 at 19:54
Jon SkeetJon Skeet
1089k69079488444
You'd need to make the enum expose value somehow, e.g.
public enum Tax {
NONE(0), SALES(10), IMPORT(5);
private final int value;
private Tax(int value) {
this.value = value;
}
public int getValue() {
return value;
}
}
...
public int getTaxValue() {
Tax tax = Tax.NONE; // Or whatever
return tax.getValue();
}
(I've changed the names to be a bit more conventional and readable, btw.)
This is assuming you want the value assigned in the constructor. If that's not what you want, you'll need to give us more information.
answered Nov 16 '11 at 19:54
Jon SkeetJon Skeet
1089k69079488444
answered Nov 16 '11 at 19:54
Jon SkeetJon Skeet
1089k69079488444
answered Nov 16 '11 at 19:54
Jon SkeetJon Skeet
1089k69079488444
answered Nov 16 '11 at 19:54
Jon SkeetJon Skeet
1089k69079488444
1089k69079488444
11
there is a better idea here stackoverflow.com/a/7996473/398348
– likejudo
Sep 10 '14 at 21:44
1
@likejiujitsu: That's going in the opposite direction. In this question, the OP already has a value of typeTax, and wants to get the numeric value from it.
– Jon Skeet
Sep 10 '14 at 22:34
I just tried it and realize it failsmyEnumValue = MyEnum.valueOf(myInt);the arg has to be of type String - or is there something I am missing?
– likejudo
Sep 10 '14 at 22:58
6
@likejiujitsu: Well it's irrelevant to this question...
– Jon Skeet
Sep 11 '14 at 0:13
This solution is worse than nothing. Seems enums in Java just shouldn't be used? Or has JDK 1.8 changed that?
– ebyrob
Nov 11 '16 at 16:10
|
show 1 more comment
11
there is a better idea here stackoverflow.com/a/7996473/398348
– likejudo
Sep 10 '14 at 21:44
1
@likejiujitsu: That's going in the opposite direction. In this question, the OP already has a value of typeTax, and wants to get the numeric value from it.
– Jon Skeet
Sep 10 '14 at 22:34
I just tried it and realize it failsmyEnumValue = MyEnum.valueOf(myInt);the arg has to be of type String - or is there something I am missing?
– likejudo
Sep 10 '14 at 22:58
6
@likejiujitsu: Well it's irrelevant to this question...
– Jon Skeet
Sep 11 '14 at 0:13
This solution is worse than nothing. Seems enums in Java just shouldn't be used? Or has JDK 1.8 changed that?
– ebyrob
Nov 11 '16 at 16:10
11
11
there is a better idea here stackoverflow.com/a/7996473/398348
– likejudo
Sep 10 '14 at 21:44
there is a better idea here stackoverflow.com/a/7996473/398348
– likejudo
Sep 10 '14 at 21:44
1
1
@likejiujitsu: That's going in the opposite direction. In this question, the OP already has a value of type
Tax, and wants to get the numeric value from it.– Jon Skeet
Sep 10 '14 at 22:34
@likejiujitsu: That's going in the opposite direction. In this question, the OP already has a value of type
Tax, and wants to get the numeric value from it.– Jon Skeet
Sep 10 '14 at 22:34
I just tried it and realize it fails
myEnumValue = MyEnum.valueOf(myInt); the arg has to be of type String - or is there something I am missing?– likejudo
Sep 10 '14 at 22:58
I just tried it and realize it fails
myEnumValue = MyEnum.valueOf(myInt); the arg has to be of type String - or is there something I am missing?– likejudo
Sep 10 '14 at 22:58
6
6
@likejiujitsu: Well it's irrelevant to this question...
– Jon Skeet
Sep 11 '14 at 0:13
@likejiujitsu: Well it's irrelevant to this question...
– Jon Skeet
Sep 11 '14 at 0:13
This solution is worse than nothing. Seems enums in Java just shouldn't be used? Or has JDK 1.8 changed that?
– ebyrob
Nov 11 '16 at 16:10
This solution is worse than nothing. Seems enums in Java just shouldn't be used? Or has JDK 1.8 changed that?
– ebyrob
Nov 11 '16 at 16:10
|
show 1 more comment
187
I prefer this:
public enum Color {
White,
Green,
Blue,
Purple,
Orange,
Red
}
then:
//cast enum to int
int color = Color.Blue.ordinal();
answered Apr 11 '13 at 3:06
viviavivia
2,108197
30
This is incorrect/not recommended by Joshua Bloch in his book Effective Java (2nd ed). See item 31.
– user504342
Oct 13 '13 at 13:49
34
@user504342 I do not have the 2nd edition of the book so can you please give us the gist of why it is not recommended?
– likejudo
Sep 10 '14 at 20:25
14
2 reasons: one, any association between the ordinal values and the constants will break if new constants are added, and two the API docs specifically recommend against it.
– jordanpg
Oct 28 '14 at 3:26
6
So clean and perfect. I see a few "don't do it" and "not recommended". I'll have to research on why it's considered bad. Some of the bloated samples look bad IMO. So much work to do such a simple task.
– Herb Meehan
May 20 '16 at 18:38
3
In a team, you're pretty sure on of your co-developer will add a value in the middle (worse at the beginning), or just sort them because they have nothing to do and completely mess the code using.ordinal()
– Michael Laffargue
May 3 '17 at 13:47
|
show 1 more comment
187
I prefer this:
public enum Color {
White,
Green,
Blue,
Purple,
Orange,
Red
}
then:
//cast enum to int
int color = Color.Blue.ordinal();
answered Apr 11 '13 at 3:06
viviavivia
2,108197
30
This is incorrect/not recommended by Joshua Bloch in his book Effective Java (2nd ed). See item 31.
– user504342
Oct 13 '13 at 13:49
34
@user504342 I do not have the 2nd edition of the book so can you please give us the gist of why it is not recommended?
– likejudo
Sep 10 '14 at 20:25
14
2 reasons: one, any association between the ordinal values and the constants will break if new constants are added, and two the API docs specifically recommend against it.
– jordanpg
Oct 28 '14 at 3:26
6
So clean and perfect. I see a few "don't do it" and "not recommended". I'll have to research on why it's considered bad. Some of the bloated samples look bad IMO. So much work to do such a simple task.
– Herb Meehan
May 20 '16 at 18:38
3
In a team, you're pretty sure on of your co-developer will add a value in the middle (worse at the beginning), or just sort them because they have nothing to do and completely mess the code using.ordinal()
– Michael Laffargue
May 3 '17 at 13:47
|
show 1 more comment
187
187
187
I prefer this:
public enum Color {
White,
Green,
Blue,
Purple,
Orange,
Red
}
then:
//cast enum to int
int color = Color.Blue.ordinal();
answered Apr 11 '13 at 3:06
viviavivia
2,108197
I prefer this:
public enum Color {
White,
Green,
Blue,
Purple,
Orange,
Red
}
then:
//cast enum to int
int color = Color.Blue.ordinal();
answered Apr 11 '13 at 3:06
viviavivia
2,108197
answered Apr 11 '13 at 3:06
viviavivia
2,108197
answered Apr 11 '13 at 3:06
viviavivia
2,108197
answered Apr 11 '13 at 3:06
viviavivia
2,108197
2,108197
30
This is incorrect/not recommended by Joshua Bloch in his book Effective Java (2nd ed). See item 31.
– user504342
Oct 13 '13 at 13:49
34
@user504342 I do not have the 2nd edition of the book so can you please give us the gist of why it is not recommended?
– likejudo
Sep 10 '14 at 20:25
14
2 reasons: one, any association between the ordinal values and the constants will break if new constants are added, and two the API docs specifically recommend against it.
– jordanpg
Oct 28 '14 at 3:26
6
So clean and perfect. I see a few "don't do it" and "not recommended". I'll have to research on why it's considered bad. Some of the bloated samples look bad IMO. So much work to do such a simple task.
– Herb Meehan
May 20 '16 at 18:38
3
In a team, you're pretty sure on of your co-developer will add a value in the middle (worse at the beginning), or just sort them because they have nothing to do and completely mess the code using.ordinal()
– Michael Laffargue
May 3 '17 at 13:47
|
show 1 more comment
30
This is incorrect/not recommended by Joshua Bloch in his book Effective Java (2nd ed). See item 31.
– user504342
Oct 13 '13 at 13:49
34
@user504342 I do not have the 2nd edition of the book so can you please give us the gist of why it is not recommended?
– likejudo
Sep 10 '14 at 20:25
14
2 reasons: one, any association between the ordinal values and the constants will break if new constants are added, and two the API docs specifically recommend against it.
– jordanpg
Oct 28 '14 at 3:26
6
So clean and perfect. I see a few "don't do it" and "not recommended". I'll have to research on why it's considered bad. Some of the bloated samples look bad IMO. So much work to do such a simple task.
– Herb Meehan
May 20 '16 at 18:38
3
In a team, you're pretty sure on of your co-developer will add a value in the middle (worse at the beginning), or just sort them because they have nothing to do and completely mess the code using.ordinal()
– Michael Laffargue
May 3 '17 at 13:47
30
30
This is incorrect/not recommended by Joshua Bloch in his book Effective Java (2nd ed). See item 31.
– user504342
Oct 13 '13 at 13:49
This is incorrect/not recommended by Joshua Bloch in his book Effective Java (2nd ed). See item 31.
– user504342
Oct 13 '13 at 13:49
34
34
@user504342 I do not have the 2nd edition of the book so can you please give us the gist of why it is not recommended?
– likejudo
Sep 10 '14 at 20:25
@user504342 I do not have the 2nd edition of the book so can you please give us the gist of why it is not recommended?
– likejudo
Sep 10 '14 at 20:25
14
14
2 reasons: one, any association between the ordinal values and the constants will break if new constants are added, and two the API docs specifically recommend against it.
– jordanpg
Oct 28 '14 at 3:26
2 reasons: one, any association between the ordinal values and the constants will break if new constants are added, and two the API docs specifically recommend against it.
– jordanpg
Oct 28 '14 at 3:26
6
6
So clean and perfect. I see a few "don't do it" and "not recommended". I'll have to research on why it's considered bad. Some of the bloated samples look bad IMO. So much work to do such a simple task.
– Herb Meehan
May 20 '16 at 18:38
So clean and perfect. I see a few "don't do it" and "not recommended". I'll have to research on why it's considered bad. Some of the bloated samples look bad IMO. So much work to do such a simple task.
– Herb Meehan
May 20 '16 at 18:38
3
3
In a team, you're pretty sure on of your co-developer will add a value in the middle (worse at the beginning), or just sort them because they have nothing to do and completely mess the code using
.ordinal()– Michael Laffargue
May 3 '17 at 13:47
In a team, you're pretty sure on of your co-developer will add a value in the middle (worse at the beginning), or just sort them because they have nothing to do and completely mess the code using
.ordinal()– Michael Laffargue
May 3 '17 at 13:47
|
show 1 more comment
17
If you want the value you are assigning in the constructor, you need to add a method in the enum definition to return that value.
If you want a unique number that represent the enum value, you can use ordinal().
answered Nov 16 '11 at 19:54
unholysamplerunholysampler
14k33662
2
Be careful. There are many more developmental anti-patterns that rely onordinal()than valid use cases forordinal(). If you need to store a unique value for theenum, then just store theenum. There are EnumSets, Lists of Enums, EnumMaps, and nearly any other Enum collection you might want available.
– Edwin Buck
Nov 16 '11 at 19:57
1
@EdwinBuck: That is good to point out, I just wanted to mention the existence ofordinal()because the OP didn't make it clear what he wanted the int to actually be.
– unholysampler
Nov 16 '11 at 20:01
Don't get ordinal. Please check the enum api regarding this. Up-vote removed.
– Hovercraft Full Of Eels
Nov 16 '11 at 20:22
3
I wonder what peoples' thoughts are about the use ofordinal()internally within the enum itself. For example, say I have an enum called "Season" which contains the valuesSpring,Summer,Autumn, andWinter, and it has a public method callednext()which returnsvalues()[(ordinal() + 1) % 4]Externally, no code ever sees the ordinal number, and there will never be additional members in this enum, so it seems like a valid use-case.
– Darrel Hoffman
Oct 29 '13 at 19:52
1
@DarrelHoffman My feeling is that doing that is fine, since the only strong arguments I see against usingordinal()hinge on far flung code being broken by changes to the enum enumeration constants. If you're going to modify the enum's constants you'd have to be in that file already. Most enums are fairly short, and if it's not you should be checking the file more thoroughly anyway. In both cases you should probably have a unit test covering yournext()method anyway.
– Alan Hensley
Jun 1 '16 at 16:26
add a comment |
17
If you want the value you are assigning in the constructor, you need to add a method in the enum definition to return that value.
If you want a unique number that represent the enum value, you can use ordinal().
answered Nov 16 '11 at 19:54
unholysamplerunholysampler
14k33662
2
Be careful. There are many more developmental anti-patterns that rely onordinal()than valid use cases forordinal(). If you need to store a unique value for theenum, then just store theenum. There are EnumSets, Lists of Enums, EnumMaps, and nearly any other Enum collection you might want available.
– Edwin Buck
Nov 16 '11 at 19:57
1
@EdwinBuck: That is good to point out, I just wanted to mention the existence ofordinal()because the OP didn't make it clear what he wanted the int to actually be.
– unholysampler
Nov 16 '11 at 20:01
Don't get ordinal. Please check the enum api regarding this. Up-vote removed.
– Hovercraft Full Of Eels
Nov 16 '11 at 20:22
3
I wonder what peoples' thoughts are about the use ofordinal()internally within the enum itself. For example, say I have an enum called "Season" which contains the valuesSpring,Summer,Autumn, andWinter, and it has a public method callednext()which returnsvalues()[(ordinal() + 1) % 4]Externally, no code ever sees the ordinal number, and there will never be additional members in this enum, so it seems like a valid use-case.
– Darrel Hoffman
Oct 29 '13 at 19:52
1
@DarrelHoffman My feeling is that doing that is fine, since the only strong arguments I see against usingordinal()hinge on far flung code being broken by changes to the enum enumeration constants. If you're going to modify the enum's constants you'd have to be in that file already. Most enums are fairly short, and if it's not you should be checking the file more thoroughly anyway. In both cases you should probably have a unit test covering yournext()method anyway.
– Alan Hensley
Jun 1 '16 at 16:26
add a comment |
17
17
17
If you want the value you are assigning in the constructor, you need to add a method in the enum definition to return that value.
If you want a unique number that represent the enum value, you can use ordinal().
answered Nov 16 '11 at 19:54
unholysamplerunholysampler
14k33662
If you want the value you are assigning in the constructor, you need to add a method in the enum definition to return that value.
If you want a unique number that represent the enum value, you can use ordinal().
answered Nov 16 '11 at 19:54
unholysamplerunholysampler
14k33662
answered Nov 16 '11 at 19:54
unholysamplerunholysampler
14k33662
answered Nov 16 '11 at 19:54
unholysamplerunholysampler
14k33662
answered Nov 16 '11 at 19:54
unholysamplerunholysampler
14k33662
14k33662
2
Be careful. There are many more developmental anti-patterns that rely onordinal()than valid use cases forordinal(). If you need to store a unique value for theenum, then just store theenum. There are EnumSets, Lists of Enums, EnumMaps, and nearly any other Enum collection you might want available.
– Edwin Buck
Nov 16 '11 at 19:57
1
@EdwinBuck: That is good to point out, I just wanted to mention the existence ofordinal()because the OP didn't make it clear what he wanted the int to actually be.
– unholysampler
Nov 16 '11 at 20:01
Don't get ordinal. Please check the enum api regarding this. Up-vote removed.
– Hovercraft Full Of Eels
Nov 16 '11 at 20:22
3
I wonder what peoples' thoughts are about the use ofordinal()internally within the enum itself. For example, say I have an enum called "Season" which contains the valuesSpring,Summer,Autumn, andWinter, and it has a public method callednext()which returnsvalues()[(ordinal() + 1) % 4]Externally, no code ever sees the ordinal number, and there will never be additional members in this enum, so it seems like a valid use-case.
– Darrel Hoffman
Oct 29 '13 at 19:52
1
@DarrelHoffman My feeling is that doing that is fine, since the only strong arguments I see against usingordinal()hinge on far flung code being broken by changes to the enum enumeration constants. If you're going to modify the enum's constants you'd have to be in that file already. Most enums are fairly short, and if it's not you should be checking the file more thoroughly anyway. In both cases you should probably have a unit test covering yournext()method anyway.
– Alan Hensley
Jun 1 '16 at 16:26
add a comment |
2
Be careful. There are many more developmental anti-patterns that rely onordinal()than valid use cases forordinal(). If you need to store a unique value for theenum, then just store theenum. There are EnumSets, Lists of Enums, EnumMaps, and nearly any other Enum collection you might want available.
– Edwin Buck
Nov 16 '11 at 19:57
1
@EdwinBuck: That is good to point out, I just wanted to mention the existence ofordinal()because the OP didn't make it clear what he wanted the int to actually be.
– unholysampler
Nov 16 '11 at 20:01
Don't get ordinal. Please check the enum api regarding this. Up-vote removed.
– Hovercraft Full Of Eels
Nov 16 '11 at 20:22
3
I wonder what peoples' thoughts are about the use ofordinal()internally within the enum itself. For example, say I have an enum called "Season" which contains the valuesSpring,Summer,Autumn, andWinter, and it has a public method callednext()which returnsvalues()[(ordinal() + 1) % 4]Externally, no code ever sees the ordinal number, and there will never be additional members in this enum, so it seems like a valid use-case.
– Darrel Hoffman
Oct 29 '13 at 19:52
1
@DarrelHoffman My feeling is that doing that is fine, since the only strong arguments I see against usingordinal()hinge on far flung code being broken by changes to the enum enumeration constants. If you're going to modify the enum's constants you'd have to be in that file already. Most enums are fairly short, and if it's not you should be checking the file more thoroughly anyway. In both cases you should probably have a unit test covering yournext()method anyway.
– Alan Hensley
Jun 1 '16 at 16:26
2
2
Be careful. There are many more developmental anti-patterns that rely on
ordinal() than valid use cases for ordinal(). If you need to store a unique value for the enum, then just store the enum. There are EnumSets, Lists of Enums, EnumMaps, and nearly any other Enum collection you might want available.– Edwin Buck
Nov 16 '11 at 19:57
Be careful. There are many more developmental anti-patterns that rely on
ordinal() than valid use cases for ordinal(). If you need to store a unique value for the enum, then just store the enum. There are EnumSets, Lists of Enums, EnumMaps, and nearly any other Enum collection you might want available.– Edwin Buck
Nov 16 '11 at 19:57
1
1
@EdwinBuck: That is good to point out, I just wanted to mention the existence of
ordinal() because the OP didn't make it clear what he wanted the int to actually be.– unholysampler
Nov 16 '11 at 20:01
@EdwinBuck: That is good to point out, I just wanted to mention the existence of
ordinal() because the OP didn't make it clear what he wanted the int to actually be.– unholysampler
Nov 16 '11 at 20:01
Don't get ordinal. Please check the enum api regarding this. Up-vote removed.
– Hovercraft Full Of Eels
Nov 16 '11 at 20:22
Don't get ordinal. Please check the enum api regarding this. Up-vote removed.
– Hovercraft Full Of Eels
Nov 16 '11 at 20:22
3
3
I wonder what peoples' thoughts are about the use of
ordinal() internally within the enum itself. For example, say I have an enum called "Season" which contains the values Spring, Summer, Autumn, and Winter, and it has a public method called next() which returns values()[(ordinal() + 1) % 4] Externally, no code ever sees the ordinal number, and there will never be additional members in this enum, so it seems like a valid use-case.– Darrel Hoffman
Oct 29 '13 at 19:52
I wonder what peoples' thoughts are about the use of
ordinal() internally within the enum itself. For example, say I have an enum called "Season" which contains the values Spring, Summer, Autumn, and Winter, and it has a public method called next() which returns values()[(ordinal() + 1) % 4] Externally, no code ever sees the ordinal number, and there will never be additional members in this enum, so it seems like a valid use-case.– Darrel Hoffman
Oct 29 '13 at 19:52
1
1
@DarrelHoffman My feeling is that doing that is fine, since the only strong arguments I see against using
ordinal() hinge on far flung code being broken by changes to the enum enumeration constants. If you're going to modify the enum's constants you'd have to be in that file already. Most enums are fairly short, and if it's not you should be checking the file more thoroughly anyway. In both cases you should probably have a unit test covering your next() method anyway.– Alan Hensley
Jun 1 '16 at 16:26
@DarrelHoffman My feeling is that doing that is fine, since the only strong arguments I see against using
ordinal() hinge on far flung code being broken by changes to the enum enumeration constants. If you're going to modify the enum's constants you'd have to be in that file already. Most enums are fairly short, and if it's not you should be checking the file more thoroughly anyway. In both cases you should probably have a unit test covering your next() method anyway.– Alan Hensley
Jun 1 '16 at 16:26
add a comment |
11
Sometime some C# approach makes the life easier in Java world..:
class XLINK {
static final short PAYLOAD = 102, ACK = 103, PAYLOAD_AND_ACK = 104;
}
//Now is trivial to use it like a C# enum:
int rcv = XLINK.ACK;
answered Jan 10 '17 at 14:06
VladiVladi
18624
For me this is the most desirable way to go. I get the benefits of enum (code clarity), a data type that is DB friendly, and I don't have to research 100 enum alternatives to do it the "android way". Simple and effective.
– John Ward
Mar 1 '17 at 15:08
Nice. It's as if the java enum is just completely disconnected from the reality of what an enum is used for... especially if people then start abusing it for things like singletons. This approach does have the disadvantage it doesn't have an easy way to get all values though.
– Nyerguds
Sep 18 '18 at 9:01
Doesn't this have the disadvantage of trying to pass an enum value to a method? You can no longer pass a XLINK to a method, because it doesn't represent anything concrete. You lose the typing into your method. The method signature would have to read short instead of XLINK.
– Dustin Jensen
Dec 20 '18 at 4:03
add a comment |
11
Sometime some C# approach makes the life easier in Java world..:
class XLINK {
static final short PAYLOAD = 102, ACK = 103, PAYLOAD_AND_ACK = 104;
}
//Now is trivial to use it like a C# enum:
int rcv = XLINK.ACK;
answered Jan 10 '17 at 14:06
VladiVladi
18624
For me this is the most desirable way to go. I get the benefits of enum (code clarity), a data type that is DB friendly, and I don't have to research 100 enum alternatives to do it the "android way". Simple and effective.
– John Ward
Mar 1 '17 at 15:08
Nice. It's as if the java enum is just completely disconnected from the reality of what an enum is used for... especially if people then start abusing it for things like singletons. This approach does have the disadvantage it doesn't have an easy way to get all values though.
– Nyerguds
Sep 18 '18 at 9:01
Doesn't this have the disadvantage of trying to pass an enum value to a method? You can no longer pass a XLINK to a method, because it doesn't represent anything concrete. You lose the typing into your method. The method signature would have to read short instead of XLINK.
– Dustin Jensen
Dec 20 '18 at 4:03
add a comment |
11
11
11
Sometime some C# approach makes the life easier in Java world..:
class XLINK {
static final short PAYLOAD = 102, ACK = 103, PAYLOAD_AND_ACK = 104;
}
//Now is trivial to use it like a C# enum:
int rcv = XLINK.ACK;
answered Jan 10 '17 at 14:06
VladiVladi
18624
Sometime some C# approach makes the life easier in Java world..:
class XLINK {
static final short PAYLOAD = 102, ACK = 103, PAYLOAD_AND_ACK = 104;
}
//Now is trivial to use it like a C# enum:
int rcv = XLINK.ACK;
answered Jan 10 '17 at 14:06
VladiVladi
18624
answered Jan 10 '17 at 14:06
VladiVladi
18624
answered Jan 10 '17 at 14:06
VladiVladi
18624
answered Jan 10 '17 at 14:06
VladiVladi
18624
18624
For me this is the most desirable way to go. I get the benefits of enum (code clarity), a data type that is DB friendly, and I don't have to research 100 enum alternatives to do it the "android way". Simple and effective.
– John Ward
Mar 1 '17 at 15:08
Nice. It's as if the java enum is just completely disconnected from the reality of what an enum is used for... especially if people then start abusing it for things like singletons. This approach does have the disadvantage it doesn't have an easy way to get all values though.
– Nyerguds
Sep 18 '18 at 9:01
Doesn't this have the disadvantage of trying to pass an enum value to a method? You can no longer pass a XLINK to a method, because it doesn't represent anything concrete. You lose the typing into your method. The method signature would have to read short instead of XLINK.
– Dustin Jensen
Dec 20 '18 at 4:03
add a comment |
For me this is the most desirable way to go. I get the benefits of enum (code clarity), a data type that is DB friendly, and I don't have to research 100 enum alternatives to do it the "android way". Simple and effective.
– John Ward
Mar 1 '17 at 15:08
Nice. It's as if the java enum is just completely disconnected from the reality of what an enum is used for... especially if people then start abusing it for things like singletons. This approach does have the disadvantage it doesn't have an easy way to get all values though.
– Nyerguds
Sep 18 '18 at 9:01
Doesn't this have the disadvantage of trying to pass an enum value to a method? You can no longer pass a XLINK to a method, because it doesn't represent anything concrete. You lose the typing into your method. The method signature would have to read short instead of XLINK.
– Dustin Jensen
Dec 20 '18 at 4:03
For me this is the most desirable way to go. I get the benefits of enum (code clarity), a data type that is DB friendly, and I don't have to research 100 enum alternatives to do it the "android way". Simple and effective.
– John Ward
Mar 1 '17 at 15:08
For me this is the most desirable way to go. I get the benefits of enum (code clarity), a data type that is DB friendly, and I don't have to research 100 enum alternatives to do it the "android way". Simple and effective.
– John Ward
Mar 1 '17 at 15:08
Nice. It's as if the java enum is just completely disconnected from the reality of what an enum is used for... especially if people then start abusing it for things like singletons. This approach does have the disadvantage it doesn't have an easy way to get all values though.
– Nyerguds
Sep 18 '18 at 9:01
Nice. It's as if the java enum is just completely disconnected from the reality of what an enum is used for... especially if people then start abusing it for things like singletons. This approach does have the disadvantage it doesn't have an easy way to get all values though.
– Nyerguds
Sep 18 '18 at 9:01
Doesn't this have the disadvantage of trying to pass an enum value to a method? You can no longer pass a XLINK to a method, because it doesn't represent anything concrete. You lose the typing into your method. The method signature would have to read short instead of XLINK.
– Dustin Jensen
Dec 20 '18 at 4:03
Doesn't this have the disadvantage of trying to pass an enum value to a method? You can no longer pass a XLINK to a method, because it doesn't represent anything concrete. You lose the typing into your method. The method signature would have to read short instead of XLINK.
– Dustin Jensen
Dec 20 '18 at 4:03
add a comment |
2
Maybe it's better to use a String representation than an integer, because the String is still valid if values are added to the enum. You can use the enum's name() method to convert the enum value to a String an the enum's valueOf() method to create an enum representation from the String again. The following example shows how to convert the enum value to String and back (ValueType is an enum):
ValueType expected = ValueType.FLOAT;
String value = expected.name();
System.out.println("Name value: " + value);
ValueType actual = ValueType.valueOf(value);
if(expected.equals(actual)) System.out.println("Values are equal");
answered Apr 12 '17 at 17:45
MikeMike
2,699285
add a comment |
2
Maybe it's better to use a String representation than an integer, because the String is still valid if values are added to the enum. You can use the enum's name() method to convert the enum value to a String an the enum's valueOf() method to create an enum representation from the String again. The following example shows how to convert the enum value to String and back (ValueType is an enum):
ValueType expected = ValueType.FLOAT;
String value = expected.name();
System.out.println("Name value: " + value);
ValueType actual = ValueType.valueOf(value);
if(expected.equals(actual)) System.out.println("Values are equal");
answered Apr 12 '17 at 17:45
MikeMike
2,699285
add a comment |
2
2
2
Maybe it's better to use a String representation than an integer, because the String is still valid if values are added to the enum. You can use the enum's name() method to convert the enum value to a String an the enum's valueOf() method to create an enum representation from the String again. The following example shows how to convert the enum value to String and back (ValueType is an enum):
ValueType expected = ValueType.FLOAT;
String value = expected.name();
System.out.println("Name value: " + value);
ValueType actual = ValueType.valueOf(value);
if(expected.equals(actual)) System.out.println("Values are equal");
answered Apr 12 '17 at 17:45
MikeMike
2,699285
Maybe it's better to use a String representation than an integer, because the String is still valid if values are added to the enum. You can use the enum's name() method to convert the enum value to a String an the enum's valueOf() method to create an enum representation from the String again. The following example shows how to convert the enum value to String and back (ValueType is an enum):
ValueType expected = ValueType.FLOAT;
String value = expected.name();
System.out.println("Name value: " + value);
ValueType actual = ValueType.valueOf(value);
if(expected.equals(actual)) System.out.println("Values are equal");
answered Apr 12 '17 at 17:45
MikeMike
2,699285
answered Apr 12 '17 at 17:45
MikeMike
2,699285
answered Apr 12 '17 at 17:45
MikeMike
2,699285
answered Apr 12 '17 at 17:45
MikeMike
2,699285
2,699285
add a comment |
add a comment |
0
public enum Tax {
NONE(1), SALES(2), IMPORT(3);
private final int value;
private Tax(int value) {
this.value = value;
}
public String toString() {
return Integer.toString(value);
}
}
class Test {
System.out.println(Tax.NONE); //Just an example.
}
edited Nov 27 '18 at 12:17
deHaar
2,50851628
answered Nov 27 '18 at 11:59
Ieshaan SaxenaIeshaan Saxena
178
add a comment |
0
public enum Tax {
NONE(1), SALES(2), IMPORT(3);
private final int value;
private Tax(int value) {
this.value = value;
}
public String toString() {
return Integer.toString(value);
}
}
class Test {
System.out.println(Tax.NONE); //Just an example.
}
edited Nov 27 '18 at 12:17
deHaar
2,50851628
answered Nov 27 '18 at 11:59
Ieshaan SaxenaIeshaan Saxena
178
add a comment |
0
0
0
public enum Tax {
NONE(1), SALES(2), IMPORT(3);
private final int value;
private Tax(int value) {
this.value = value;
}
public String toString() {
return Integer.toString(value);
}
}
class Test {
System.out.println(Tax.NONE); //Just an example.
}
edited Nov 27 '18 at 12:17
deHaar
2,50851628
answered Nov 27 '18 at 11:59
Ieshaan SaxenaIeshaan Saxena
178
public enum Tax {
NONE(1), SALES(2), IMPORT(3);
private final int value;
private Tax(int value) {
this.value = value;
}
public String toString() {
return Integer.toString(value);
}
}
class Test {
System.out.println(Tax.NONE); //Just an example.
}
edited Nov 27 '18 at 12:17
deHaar
2,50851628
answered Nov 27 '18 at 11:59
Ieshaan SaxenaIeshaan Saxena
178
edited Nov 27 '18 at 12:17
deHaar
2,50851628
edited Nov 27 '18 at 12:17
deHaar
2,50851628
edited Nov 27 '18 at 12:17
deHaar
2,50851628
2,50851628
answered Nov 27 '18 at 11:59
Ieshaan SaxenaIeshaan Saxena
178
answered Nov 27 '18 at 11:59
Ieshaan SaxenaIeshaan Saxena
178
answered Nov 27 '18 at 11:59
Ieshaan SaxenaIeshaan Saxena
178
178
add a comment |
add a comment |
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1
Possible duplicate of How to match int to enum
– malat
Nov 18 '16 at 13:38