Java. How to override method in class with private constructor
I want to override toString() method of class LocalDate. I know how to override toString() method of class with public constructor like java.util.Date using code like this:
Date date = new Date ()
@override
public String toString() ...
But i cant do the same thing with class that have private constructor like java.time.LocalDate
Is there are any way how i can workaround this?
java constructor override private tostring
asked Nov 14 '18 at 14:54
A_GubarA_Gubar
132
add a comment |
I want to override toString() method of class LocalDate. I know how to override toString() method of class with public constructor like java.util.Date using code like this:
Date date = new Date ()
@override
public String toString() ...
But i cant do the same thing with class that have private constructor like java.time.LocalDate
Is there are any way how i can workaround this?
java constructor override private tostring
asked Nov 14 '18 at 14:54
A_GubarA_Gubar
132
3
No, you can’t do that. TheLocalDateclass is final, meaning you cannot create any subclass. It’s also the wrong way of obtaining what you want. To format aLocalDateinto the string of your liking use an appropriateDateTimeFormatter.
– Ole V.V.
Nov 14 '18 at 14:55
Possibly related: Localdate.format, format is not applied
– Ole V.V.
Nov 14 '18 at 14:58
I appreciate the comeback!
– GhostCat
Nov 18 '18 at 18:19
add a comment |
I want to override toString() method of class LocalDate. I know how to override toString() method of class with public constructor like java.util.Date using code like this:
Date date = new Date ()
@override
public String toString() ...
But i cant do the same thing with class that have private constructor like java.time.LocalDate
Is there are any way how i can workaround this?
java constructor override private tostring
asked Nov 14 '18 at 14:54
A_GubarA_Gubar
132
I want to override toString() method of class LocalDate. I know how to override toString() method of class with public constructor like java.util.Date using code like this:
Date date = new Date ()
@override
public String toString() ...
But i cant do the same thing with class that have private constructor like java.time.LocalDate
Is there are any way how i can workaround this?
java constructor override private tostring
java constructor override private tostring
asked Nov 14 '18 at 14:54
A_GubarA_Gubar
132
asked Nov 14 '18 at 14:54
A_GubarA_Gubar
132
asked Nov 14 '18 at 14:54
A_GubarA_Gubar
132
asked Nov 14 '18 at 14:54
A_GubarA_Gubar
132
asked Nov 14 '18 at 14:54
A_GubarA_Gubar
132
132
3
No, you can’t do that. TheLocalDateclass is final, meaning you cannot create any subclass. It’s also the wrong way of obtaining what you want. To format aLocalDateinto the string of your liking use an appropriateDateTimeFormatter.
– Ole V.V.
Nov 14 '18 at 14:55
Possibly related: Localdate.format, format is not applied
– Ole V.V.
Nov 14 '18 at 14:58
I appreciate the comeback!
– GhostCat
Nov 18 '18 at 18:19
add a comment |
3
No, you can’t do that. TheLocalDateclass is final, meaning you cannot create any subclass. It’s also the wrong way of obtaining what you want. To format aLocalDateinto the string of your liking use an appropriateDateTimeFormatter.
– Ole V.V.
Nov 14 '18 at 14:55
Possibly related: Localdate.format, format is not applied
– Ole V.V.
Nov 14 '18 at 14:58
I appreciate the comeback!
– GhostCat
Nov 18 '18 at 18:19
3
3
No, you can’t do that. The
LocalDate class is final, meaning you cannot create any subclass. It’s also the wrong way of obtaining what you want. To format a LocalDate into the string of your liking use an appropriate DateTimeFormatter.– Ole V.V.
Nov 14 '18 at 14:55
No, you can’t do that. The
LocalDate class is final, meaning you cannot create any subclass. It’s also the wrong way of obtaining what you want. To format a LocalDate into the string of your liking use an appropriate DateTimeFormatter.– Ole V.V.
Nov 14 '18 at 14:55
Possibly related: Localdate.format, format is not applied
– Ole V.V.
Nov 14 '18 at 14:58
Possibly related: Localdate.format, format is not applied
– Ole V.V.
Nov 14 '18 at 14:58
I appreciate the comeback!
– GhostCat
Nov 18 '18 at 18:19
I appreciate the comeback!
– GhostCat
Nov 18 '18 at 18:19
add a comment |
2 Answers
2
active
oldest
votes
The simple answer is: you can't.
That class javadoc tells you:
public final class LocalDate
You can't extend a final class, therefore you can't change the behavior of any of its methods, at least not in Java. (Kotlin offers extension methods, that allow you to do "sort of" that thing).
But as pointed out in the comments, assuming that your problem is to properly format a Date, LocalDate, ... instance, then overriding toString() is simply the wrong approach. You turn date objects into formatted date strings by using a DateFormatter, see here for guidance.
answered Nov 14 '18 at 15:05
GhostCatGhostCat
91.9k1688147
add a comment |
We cannot override methods of a final class.
edited Nov 15 '18 at 15:42
Ole V.V.
29.2k63453
answered Nov 14 '18 at 15:08
Karthik PKarthik P
336
add a comment |
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2 Answers
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2 Answers
2
active
oldest
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active
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active
oldest
votes
The simple answer is: you can't.
That class javadoc tells you:
public final class LocalDate
You can't extend a final class, therefore you can't change the behavior of any of its methods, at least not in Java. (Kotlin offers extension methods, that allow you to do "sort of" that thing).
But as pointed out in the comments, assuming that your problem is to properly format a Date, LocalDate, ... instance, then overriding toString() is simply the wrong approach. You turn date objects into formatted date strings by using a DateFormatter, see here for guidance.
answered Nov 14 '18 at 15:05
GhostCatGhostCat
91.9k1688147
add a comment |
The simple answer is: you can't.
That class javadoc tells you:
public final class LocalDate
You can't extend a final class, therefore you can't change the behavior of any of its methods, at least not in Java. (Kotlin offers extension methods, that allow you to do "sort of" that thing).
But as pointed out in the comments, assuming that your problem is to properly format a Date, LocalDate, ... instance, then overriding toString() is simply the wrong approach. You turn date objects into formatted date strings by using a DateFormatter, see here for guidance.
answered Nov 14 '18 at 15:05
GhostCatGhostCat
91.9k1688147
add a comment |
The simple answer is: you can't.
That class javadoc tells you:
public final class LocalDate
You can't extend a final class, therefore you can't change the behavior of any of its methods, at least not in Java. (Kotlin offers extension methods, that allow you to do "sort of" that thing).
But as pointed out in the comments, assuming that your problem is to properly format a Date, LocalDate, ... instance, then overriding toString() is simply the wrong approach. You turn date objects into formatted date strings by using a DateFormatter, see here for guidance.
answered Nov 14 '18 at 15:05
GhostCatGhostCat
91.9k1688147
The simple answer is: you can't.
That class javadoc tells you:
public final class LocalDate
You can't extend a final class, therefore you can't change the behavior of any of its methods, at least not in Java. (Kotlin offers extension methods, that allow you to do "sort of" that thing).
But as pointed out in the comments, assuming that your problem is to properly format a Date, LocalDate, ... instance, then overriding toString() is simply the wrong approach. You turn date objects into formatted date strings by using a DateFormatter, see here for guidance.
answered Nov 14 '18 at 15:05
GhostCatGhostCat
91.9k1688147
edited Nov 14 '18 at 15:16
answered Nov 14 '18 at 15:05
GhostCatGhostCat
91.9k1688147
answered Nov 14 '18 at 15:05
GhostCatGhostCat
91.9k1688147
answered Nov 14 '18 at 15:05
GhostCatGhostCat
91.9k1688147
91.9k1688147
add a comment |
add a comment |
We cannot override methods of a final class.
edited Nov 15 '18 at 15:42
Ole V.V.
29.2k63453
answered Nov 14 '18 at 15:08
Karthik PKarthik P
336
add a comment |
We cannot override methods of a final class.
edited Nov 15 '18 at 15:42
Ole V.V.
29.2k63453
answered Nov 14 '18 at 15:08
Karthik PKarthik P
336
add a comment |
We cannot override methods of a final class.
edited Nov 15 '18 at 15:42
Ole V.V.
29.2k63453
answered Nov 14 '18 at 15:08
Karthik PKarthik P
336
We cannot override methods of a final class.
edited Nov 15 '18 at 15:42
Ole V.V.
29.2k63453
answered Nov 14 '18 at 15:08
Karthik PKarthik P
336
edited Nov 15 '18 at 15:42
Ole V.V.
29.2k63453
edited Nov 15 '18 at 15:42
Ole V.V.
29.2k63453
edited Nov 15 '18 at 15:42
Ole V.V.
29.2k63453
29.2k63453
answered Nov 14 '18 at 15:08
Karthik PKarthik P
336
answered Nov 14 '18 at 15:08
Karthik PKarthik P
336
answered Nov 14 '18 at 15:08
Karthik PKarthik P
336
336
add a comment |
add a comment |
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3
No, you can’t do that. The
LocalDateclass is final, meaning you cannot create any subclass. It’s also the wrong way of obtaining what you want. To format aLocalDateinto the string of your liking use an appropriateDateTimeFormatter.– Ole V.V.
Nov 14 '18 at 14:55
Possibly related: Localdate.format, format is not applied
– Ole V.V.
Nov 14 '18 at 14:58
I appreciate the comeback!
– GhostCat
Nov 18 '18 at 18:19