What is the design pattern that Wrapper Classes use in Java?











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I have found an old post on StackOverflow which does not clarify my understanding about the design patterns that are used by Wrapper Classes:
What is a wrapper class? Moreover, on reading from Wikipedia I am not getting any clear information.



Does a Wrapper Class really use any design pattern or not?



If it is using a pattern, then which pattern is it out of these: Decorator Pattern, Facade Pattern or Adapter Pattern?










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  • 2




    My take on it is that a wrapper class is no pattern, it just wraps existing classes. Patterns like Decorator, Facade and Adapter often make use of a wrapper class. But that's only my opinion!
    – Nordiii
    Nov 15 at 8:43















up vote
11
down vote

favorite
4












I have found an old post on StackOverflow which does not clarify my understanding about the design patterns that are used by Wrapper Classes:
What is a wrapper class? Moreover, on reading from Wikipedia I am not getting any clear information.



Does a Wrapper Class really use any design pattern or not?



If it is using a pattern, then which pattern is it out of these: Decorator Pattern, Facade Pattern or Adapter Pattern?










share|improve this question









New contributor




zack is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
















  • 2




    My take on it is that a wrapper class is no pattern, it just wraps existing classes. Patterns like Decorator, Facade and Adapter often make use of a wrapper class. But that's only my opinion!
    – Nordiii
    Nov 15 at 8:43













up vote
11
down vote

favorite
4









up vote
11
down vote

favorite
4






4





I have found an old post on StackOverflow which does not clarify my understanding about the design patterns that are used by Wrapper Classes:
What is a wrapper class? Moreover, on reading from Wikipedia I am not getting any clear information.



Does a Wrapper Class really use any design pattern or not?



If it is using a pattern, then which pattern is it out of these: Decorator Pattern, Facade Pattern or Adapter Pattern?










share|improve this question









New contributor




zack is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











I have found an old post on StackOverflow which does not clarify my understanding about the design patterns that are used by Wrapper Classes:
What is a wrapper class? Moreover, on reading from Wikipedia I am not getting any clear information.



Does a Wrapper Class really use any design pattern or not?



If it is using a pattern, then which pattern is it out of these: Decorator Pattern, Facade Pattern or Adapter Pattern?







design-patterns adapter decorator wrapper facade






share|improve this question









New contributor




zack is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









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edited yesterday









jaco0646

4,36652345




4,36652345






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asked Nov 15 at 8:34









zack

696




696




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zack is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






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Check out our Code of Conduct.








  • 2




    My take on it is that a wrapper class is no pattern, it just wraps existing classes. Patterns like Decorator, Facade and Adapter often make use of a wrapper class. But that's only my opinion!
    – Nordiii
    Nov 15 at 8:43














  • 2




    My take on it is that a wrapper class is no pattern, it just wraps existing classes. Patterns like Decorator, Facade and Adapter often make use of a wrapper class. But that's only my opinion!
    – Nordiii
    Nov 15 at 8:43








2




2




My take on it is that a wrapper class is no pattern, it just wraps existing classes. Patterns like Decorator, Facade and Adapter often make use of a wrapper class. But that's only my opinion!
– Nordiii
Nov 15 at 8:43




My take on it is that a wrapper class is no pattern, it just wraps existing classes. Patterns like Decorator, Facade and Adapter often make use of a wrapper class. But that's only my opinion!
– Nordiii
Nov 15 at 8:43












5 Answers
5






active

oldest

votes

















up vote
6
down vote













If you refer to wrapping primitive




Wrapper classes provide a way to use primitive types as objects




Adapter pattern is the most exact meaning:




A decorator makes it possible to add or alter behavior of an interface at run-time. Alternatively, the adapter can be used when the wrapper must respect a particular interface and must support polymorphic behavior, and the Facade when an easier or simpler interface to an underlying object is desired




We use Wrapper class ability to use primitive as Objects, meaning add support to a polymorphic behavior






share|improve this answer























  • Might be worthwhile adding examples of wrappers as adapters - eg boxing of primitive types, COM component wrappers.
    – just.another.programmer
    2 days ago










  • @just.another.programmer the question already ask about boxing of primitive type,no ?
    – user7294900
    2 days ago










  • Your adapter pattern link goes to the decorator pattern
    – Michael
    2 days ago












  • @Michael true, but it has good description when to use either
    – user7294900
    2 days ago






  • 1




    I didn't see anything explicit about boxing of primitives in the question. OP just says "Wrapper Classes".
    – just.another.programmer
    2 days ago


















up vote
5
down vote













All of the three design patterns in someway describe a wrapper:




  • Decorator pattern. Wraps a component and potentially decorates it with some additional characteristics.

  • Adapter pattern. Simply wraps a component to provide a suitable interface for consumers.

  • Facade pattern. Wraps a component to facilitate the usage of otherwise complex external interface.






share|improve this answer























  • Not a decorator. A decorator isolates behavior into separate classes which can be added to the "main" component independently. The structure requires wrapping the main component, but that's not the main point.
    – just.another.programmer
    2 days ago










  • Not a facade. A facade is all about changing the public API of a class. That's a lot more than just "wrapping" it.
    – just.another.programmer
    2 days ago










  • Have you checked wikipedia: en.wikipedia.org/wiki/Decorator_pattern?. A basic test is to look the occurences of the word wrapper. Otherwise you can read the Intent part...If you want to find a black dot in white wall you almost certainly always will, but this time is not the point IMO.
    – NiVeR
    2 days ago








  • 1




    If you notice, I said in someway, it doesn't mean ===. It means to some extent. Your points are wrong in my opinion.
    – NiVeR
    2 days ago








  • 1




    Decorator classes wrap the original type as an implementation detail. The key difference is their purpose: to extend or alter behavior, not the interface. It's kind of like the "all squares are rectangles but not all rectangles are squares".
    – just.another.programmer
    2 days ago


















up vote
3
down vote













Well, the answers seems like to indicate that you can wrap an object for many reasons and as such, many patterns. So I'll try to give a more general answer.



A Wrapper is basically an object whose sole purpose is to provide something without modifying the main object (add fonctionnalities, simplify API, serialisation, ... see other answers), that wrapper is generally tightly coupled to the "main" object. For exemples look others answers.



Another alternative for some usage of the wrapper is inheritance, but not for every case.



As such the wrapper is just a technical way of doing some stuff. It is not a pattern in itself.






share|improve this answer




























    up vote
    1
    down vote













    They don't follow any of the design patterns that you have mentioned.



    Adapter converts the interface of a class to another interface. Primitives do not implement any interfaces.



    Decorator adds behaviour of to a class implementing one interface by wrapping it in another that implements the same interface. Primitives do not implement any interfaces.



    A facade's purpose is to mask the complex behaviour of the object that it's wrapping. There is nothing less complex in a programming language than a primitive. The clue's in the name. If anything, the wrapper classes are the opposite of this.





    Off the top of my here, here's a few design patterns that they do make use of:



    Integer, Long and Byte make use of an object pool of flyweight objects, to avoid creating unnecessary instances.



    Boolean somewhat tries to be a multiton (in that the constructor is deprecated) but in practice it isn't.






    share|improve this answer





















    • all Wrapper classes constructor are deprecated in java 9 as docs.oracle.com/javase/9/docs/api/?java/lang/Integer.html
      – user7294900
      2 days ago












    • @user7294900 Sure. What's your point?
      – Michael
      2 days ago










    • You wrote the note specific for Boolean
      – user7294900
      2 days ago










    • @user7294900 Because that's the only one which is (sort of) a multiton (Boolean.TRUE and Boolean.FALSE).
      – Michael
      2 days ago




















    up vote
    1
    down vote













    Wrapper classes use composition. The same composition as in the popular maxim, "Favor composition over inheritance." Composition is not a design pattern; however, most OO design patterns use composition as part of their implementation. This is one reason many people struggle to discriminate among different design patterns: the common use of composition makes them all appear the same to a certain degree.



    There are two basic parts in a composition relationship: the composer and the composed. You can think of this generally as a part/whole relationship. It may be one-to-one or one-to-many. A wrapper is the composer, i.e. it is the whole. It may wrap one or more composed parts.



    Many different design patterns make use of the general composition relationship for different purposes. Many of those different patterns are referred to collectively as "wrappers". The GoF book calls out at least two such patterns.






    • ADAPTER Also Known As Wrapper page 139


    • DECORATOR Also Known As Wrapper page 175




    In summary, Wrapper is not any single design pattern; rather, it is a category of design patterns. Incidentally, we see the same dynamic with the term Factory. There is no single design pattern named Factory; rather, it is a category of design patterns.






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      5 Answers
      5






      active

      oldest

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      5 Answers
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      active

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      up vote
      6
      down vote













      If you refer to wrapping primitive




      Wrapper classes provide a way to use primitive types as objects




      Adapter pattern is the most exact meaning:




      A decorator makes it possible to add or alter behavior of an interface at run-time. Alternatively, the adapter can be used when the wrapper must respect a particular interface and must support polymorphic behavior, and the Facade when an easier or simpler interface to an underlying object is desired




      We use Wrapper class ability to use primitive as Objects, meaning add support to a polymorphic behavior






      share|improve this answer























      • Might be worthwhile adding examples of wrappers as adapters - eg boxing of primitive types, COM component wrappers.
        – just.another.programmer
        2 days ago










      • @just.another.programmer the question already ask about boxing of primitive type,no ?
        – user7294900
        2 days ago










      • Your adapter pattern link goes to the decorator pattern
        – Michael
        2 days ago












      • @Michael true, but it has good description when to use either
        – user7294900
        2 days ago






      • 1




        I didn't see anything explicit about boxing of primitives in the question. OP just says "Wrapper Classes".
        – just.another.programmer
        2 days ago















      up vote
      6
      down vote













      If you refer to wrapping primitive




      Wrapper classes provide a way to use primitive types as objects




      Adapter pattern is the most exact meaning:




      A decorator makes it possible to add or alter behavior of an interface at run-time. Alternatively, the adapter can be used when the wrapper must respect a particular interface and must support polymorphic behavior, and the Facade when an easier or simpler interface to an underlying object is desired




      We use Wrapper class ability to use primitive as Objects, meaning add support to a polymorphic behavior






      share|improve this answer























      • Might be worthwhile adding examples of wrappers as adapters - eg boxing of primitive types, COM component wrappers.
        – just.another.programmer
        2 days ago










      • @just.another.programmer the question already ask about boxing of primitive type,no ?
        – user7294900
        2 days ago










      • Your adapter pattern link goes to the decorator pattern
        – Michael
        2 days ago












      • @Michael true, but it has good description when to use either
        – user7294900
        2 days ago






      • 1




        I didn't see anything explicit about boxing of primitives in the question. OP just says "Wrapper Classes".
        – just.another.programmer
        2 days ago













      up vote
      6
      down vote










      up vote
      6
      down vote









      If you refer to wrapping primitive




      Wrapper classes provide a way to use primitive types as objects




      Adapter pattern is the most exact meaning:




      A decorator makes it possible to add or alter behavior of an interface at run-time. Alternatively, the adapter can be used when the wrapper must respect a particular interface and must support polymorphic behavior, and the Facade when an easier or simpler interface to an underlying object is desired




      We use Wrapper class ability to use primitive as Objects, meaning add support to a polymorphic behavior






      share|improve this answer














      If you refer to wrapping primitive




      Wrapper classes provide a way to use primitive types as objects




      Adapter pattern is the most exact meaning:




      A decorator makes it possible to add or alter behavior of an interface at run-time. Alternatively, the adapter can be used when the wrapper must respect a particular interface and must support polymorphic behavior, and the Facade when an easier or simpler interface to an underlying object is desired




      We use Wrapper class ability to use primitive as Objects, meaning add support to a polymorphic behavior







      share|improve this answer














      share|improve this answer



      share|improve this answer








      edited 2 days ago

























      answered Nov 15 at 8:38









      user7294900

      17.8k93056




      17.8k93056












      • Might be worthwhile adding examples of wrappers as adapters - eg boxing of primitive types, COM component wrappers.
        – just.another.programmer
        2 days ago










      • @just.another.programmer the question already ask about boxing of primitive type,no ?
        – user7294900
        2 days ago










      • Your adapter pattern link goes to the decorator pattern
        – Michael
        2 days ago












      • @Michael true, but it has good description when to use either
        – user7294900
        2 days ago






      • 1




        I didn't see anything explicit about boxing of primitives in the question. OP just says "Wrapper Classes".
        – just.another.programmer
        2 days ago


















      • Might be worthwhile adding examples of wrappers as adapters - eg boxing of primitive types, COM component wrappers.
        – just.another.programmer
        2 days ago










      • @just.another.programmer the question already ask about boxing of primitive type,no ?
        – user7294900
        2 days ago










      • Your adapter pattern link goes to the decorator pattern
        – Michael
        2 days ago












      • @Michael true, but it has good description when to use either
        – user7294900
        2 days ago






      • 1




        I didn't see anything explicit about boxing of primitives in the question. OP just says "Wrapper Classes".
        – just.another.programmer
        2 days ago
















      Might be worthwhile adding examples of wrappers as adapters - eg boxing of primitive types, COM component wrappers.
      – just.another.programmer
      2 days ago




      Might be worthwhile adding examples of wrappers as adapters - eg boxing of primitive types, COM component wrappers.
      – just.another.programmer
      2 days ago












      @just.another.programmer the question already ask about boxing of primitive type,no ?
      – user7294900
      2 days ago




      @just.another.programmer the question already ask about boxing of primitive type,no ?
      – user7294900
      2 days ago












      Your adapter pattern link goes to the decorator pattern
      – Michael
      2 days ago






      Your adapter pattern link goes to the decorator pattern
      – Michael
      2 days ago














      @Michael true, but it has good description when to use either
      – user7294900
      2 days ago




      @Michael true, but it has good description when to use either
      – user7294900
      2 days ago




      1




      1




      I didn't see anything explicit about boxing of primitives in the question. OP just says "Wrapper Classes".
      – just.another.programmer
      2 days ago




      I didn't see anything explicit about boxing of primitives in the question. OP just says "Wrapper Classes".
      – just.another.programmer
      2 days ago












      up vote
      5
      down vote













      All of the three design patterns in someway describe a wrapper:




      • Decorator pattern. Wraps a component and potentially decorates it with some additional characteristics.

      • Adapter pattern. Simply wraps a component to provide a suitable interface for consumers.

      • Facade pattern. Wraps a component to facilitate the usage of otherwise complex external interface.






      share|improve this answer























      • Not a decorator. A decorator isolates behavior into separate classes which can be added to the "main" component independently. The structure requires wrapping the main component, but that's not the main point.
        – just.another.programmer
        2 days ago










      • Not a facade. A facade is all about changing the public API of a class. That's a lot more than just "wrapping" it.
        – just.another.programmer
        2 days ago










      • Have you checked wikipedia: en.wikipedia.org/wiki/Decorator_pattern?. A basic test is to look the occurences of the word wrapper. Otherwise you can read the Intent part...If you want to find a black dot in white wall you almost certainly always will, but this time is not the point IMO.
        – NiVeR
        2 days ago








      • 1




        If you notice, I said in someway, it doesn't mean ===. It means to some extent. Your points are wrong in my opinion.
        – NiVeR
        2 days ago








      • 1




        Decorator classes wrap the original type as an implementation detail. The key difference is their purpose: to extend or alter behavior, not the interface. It's kind of like the "all squares are rectangles but not all rectangles are squares".
        – just.another.programmer
        2 days ago















      up vote
      5
      down vote













      All of the three design patterns in someway describe a wrapper:




      • Decorator pattern. Wraps a component and potentially decorates it with some additional characteristics.

      • Adapter pattern. Simply wraps a component to provide a suitable interface for consumers.

      • Facade pattern. Wraps a component to facilitate the usage of otherwise complex external interface.






      share|improve this answer























      • Not a decorator. A decorator isolates behavior into separate classes which can be added to the "main" component independently. The structure requires wrapping the main component, but that's not the main point.
        – just.another.programmer
        2 days ago










      • Not a facade. A facade is all about changing the public API of a class. That's a lot more than just "wrapping" it.
        – just.another.programmer
        2 days ago










      • Have you checked wikipedia: en.wikipedia.org/wiki/Decorator_pattern?. A basic test is to look the occurences of the word wrapper. Otherwise you can read the Intent part...If you want to find a black dot in white wall you almost certainly always will, but this time is not the point IMO.
        – NiVeR
        2 days ago








      • 1




        If you notice, I said in someway, it doesn't mean ===. It means to some extent. Your points are wrong in my opinion.
        – NiVeR
        2 days ago








      • 1




        Decorator classes wrap the original type as an implementation detail. The key difference is their purpose: to extend or alter behavior, not the interface. It's kind of like the "all squares are rectangles but not all rectangles are squares".
        – just.another.programmer
        2 days ago













      up vote
      5
      down vote










      up vote
      5
      down vote









      All of the three design patterns in someway describe a wrapper:




      • Decorator pattern. Wraps a component and potentially decorates it with some additional characteristics.

      • Adapter pattern. Simply wraps a component to provide a suitable interface for consumers.

      • Facade pattern. Wraps a component to facilitate the usage of otherwise complex external interface.






      share|improve this answer














      All of the three design patterns in someway describe a wrapper:




      • Decorator pattern. Wraps a component and potentially decorates it with some additional characteristics.

      • Adapter pattern. Simply wraps a component to provide a suitable interface for consumers.

      • Facade pattern. Wraps a component to facilitate the usage of otherwise complex external interface.







      share|improve this answer














      share|improve this answer



      share|improve this answer








      edited 2 days ago

























      answered Nov 15 at 8:41









      NiVeR

      6,47141930




      6,47141930












      • Not a decorator. A decorator isolates behavior into separate classes which can be added to the "main" component independently. The structure requires wrapping the main component, but that's not the main point.
        – just.another.programmer
        2 days ago










      • Not a facade. A facade is all about changing the public API of a class. That's a lot more than just "wrapping" it.
        – just.another.programmer
        2 days ago










      • Have you checked wikipedia: en.wikipedia.org/wiki/Decorator_pattern?. A basic test is to look the occurences of the word wrapper. Otherwise you can read the Intent part...If you want to find a black dot in white wall you almost certainly always will, but this time is not the point IMO.
        – NiVeR
        2 days ago








      • 1




        If you notice, I said in someway, it doesn't mean ===. It means to some extent. Your points are wrong in my opinion.
        – NiVeR
        2 days ago








      • 1




        Decorator classes wrap the original type as an implementation detail. The key difference is their purpose: to extend or alter behavior, not the interface. It's kind of like the "all squares are rectangles but not all rectangles are squares".
        – just.another.programmer
        2 days ago


















      • Not a decorator. A decorator isolates behavior into separate classes which can be added to the "main" component independently. The structure requires wrapping the main component, but that's not the main point.
        – just.another.programmer
        2 days ago










      • Not a facade. A facade is all about changing the public API of a class. That's a lot more than just "wrapping" it.
        – just.another.programmer
        2 days ago










      • Have you checked wikipedia: en.wikipedia.org/wiki/Decorator_pattern?. A basic test is to look the occurences of the word wrapper. Otherwise you can read the Intent part...If you want to find a black dot in white wall you almost certainly always will, but this time is not the point IMO.
        – NiVeR
        2 days ago








      • 1




        If you notice, I said in someway, it doesn't mean ===. It means to some extent. Your points are wrong in my opinion.
        – NiVeR
        2 days ago








      • 1




        Decorator classes wrap the original type as an implementation detail. The key difference is their purpose: to extend or alter behavior, not the interface. It's kind of like the "all squares are rectangles but not all rectangles are squares".
        – just.another.programmer
        2 days ago
















      Not a decorator. A decorator isolates behavior into separate classes which can be added to the "main" component independently. The structure requires wrapping the main component, but that's not the main point.
      – just.another.programmer
      2 days ago




      Not a decorator. A decorator isolates behavior into separate classes which can be added to the "main" component independently. The structure requires wrapping the main component, but that's not the main point.
      – just.another.programmer
      2 days ago












      Not a facade. A facade is all about changing the public API of a class. That's a lot more than just "wrapping" it.
      – just.another.programmer
      2 days ago




      Not a facade. A facade is all about changing the public API of a class. That's a lot more than just "wrapping" it.
      – just.another.programmer
      2 days ago












      Have you checked wikipedia: en.wikipedia.org/wiki/Decorator_pattern?. A basic test is to look the occurences of the word wrapper. Otherwise you can read the Intent part...If you want to find a black dot in white wall you almost certainly always will, but this time is not the point IMO.
      – NiVeR
      2 days ago






      Have you checked wikipedia: en.wikipedia.org/wiki/Decorator_pattern?. A basic test is to look the occurences of the word wrapper. Otherwise you can read the Intent part...If you want to find a black dot in white wall you almost certainly always will, but this time is not the point IMO.
      – NiVeR
      2 days ago






      1




      1




      If you notice, I said in someway, it doesn't mean ===. It means to some extent. Your points are wrong in my opinion.
      – NiVeR
      2 days ago






      If you notice, I said in someway, it doesn't mean ===. It means to some extent. Your points are wrong in my opinion.
      – NiVeR
      2 days ago






      1




      1




      Decorator classes wrap the original type as an implementation detail. The key difference is their purpose: to extend or alter behavior, not the interface. It's kind of like the "all squares are rectangles but not all rectangles are squares".
      – just.another.programmer
      2 days ago




      Decorator classes wrap the original type as an implementation detail. The key difference is their purpose: to extend or alter behavior, not the interface. It's kind of like the "all squares are rectangles but not all rectangles are squares".
      – just.another.programmer
      2 days ago










      up vote
      3
      down vote













      Well, the answers seems like to indicate that you can wrap an object for many reasons and as such, many patterns. So I'll try to give a more general answer.



      A Wrapper is basically an object whose sole purpose is to provide something without modifying the main object (add fonctionnalities, simplify API, serialisation, ... see other answers), that wrapper is generally tightly coupled to the "main" object. For exemples look others answers.



      Another alternative for some usage of the wrapper is inheritance, but not for every case.



      As such the wrapper is just a technical way of doing some stuff. It is not a pattern in itself.






      share|improve this answer

























        up vote
        3
        down vote













        Well, the answers seems like to indicate that you can wrap an object for many reasons and as such, many patterns. So I'll try to give a more general answer.



        A Wrapper is basically an object whose sole purpose is to provide something without modifying the main object (add fonctionnalities, simplify API, serialisation, ... see other answers), that wrapper is generally tightly coupled to the "main" object. For exemples look others answers.



        Another alternative for some usage of the wrapper is inheritance, but not for every case.



        As such the wrapper is just a technical way of doing some stuff. It is not a pattern in itself.






        share|improve this answer























          up vote
          3
          down vote










          up vote
          3
          down vote









          Well, the answers seems like to indicate that you can wrap an object for many reasons and as such, many patterns. So I'll try to give a more general answer.



          A Wrapper is basically an object whose sole purpose is to provide something without modifying the main object (add fonctionnalities, simplify API, serialisation, ... see other answers), that wrapper is generally tightly coupled to the "main" object. For exemples look others answers.



          Another alternative for some usage of the wrapper is inheritance, but not for every case.



          As such the wrapper is just a technical way of doing some stuff. It is not a pattern in itself.






          share|improve this answer












          Well, the answers seems like to indicate that you can wrap an object for many reasons and as such, many patterns. So I'll try to give a more general answer.



          A Wrapper is basically an object whose sole purpose is to provide something without modifying the main object (add fonctionnalities, simplify API, serialisation, ... see other answers), that wrapper is generally tightly coupled to the "main" object. For exemples look others answers.



          Another alternative for some usage of the wrapper is inheritance, but not for every case.



          As such the wrapper is just a technical way of doing some stuff. It is not a pattern in itself.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered 2 days ago









          Walfrat

          5,0691131




          5,0691131






















              up vote
              1
              down vote













              They don't follow any of the design patterns that you have mentioned.



              Adapter converts the interface of a class to another interface. Primitives do not implement any interfaces.



              Decorator adds behaviour of to a class implementing one interface by wrapping it in another that implements the same interface. Primitives do not implement any interfaces.



              A facade's purpose is to mask the complex behaviour of the object that it's wrapping. There is nothing less complex in a programming language than a primitive. The clue's in the name. If anything, the wrapper classes are the opposite of this.





              Off the top of my here, here's a few design patterns that they do make use of:



              Integer, Long and Byte make use of an object pool of flyweight objects, to avoid creating unnecessary instances.



              Boolean somewhat tries to be a multiton (in that the constructor is deprecated) but in practice it isn't.






              share|improve this answer





















              • all Wrapper classes constructor are deprecated in java 9 as docs.oracle.com/javase/9/docs/api/?java/lang/Integer.html
                – user7294900
                2 days ago












              • @user7294900 Sure. What's your point?
                – Michael
                2 days ago










              • You wrote the note specific for Boolean
                – user7294900
                2 days ago










              • @user7294900 Because that's the only one which is (sort of) a multiton (Boolean.TRUE and Boolean.FALSE).
                – Michael
                2 days ago

















              up vote
              1
              down vote













              They don't follow any of the design patterns that you have mentioned.



              Adapter converts the interface of a class to another interface. Primitives do not implement any interfaces.



              Decorator adds behaviour of to a class implementing one interface by wrapping it in another that implements the same interface. Primitives do not implement any interfaces.



              A facade's purpose is to mask the complex behaviour of the object that it's wrapping. There is nothing less complex in a programming language than a primitive. The clue's in the name. If anything, the wrapper classes are the opposite of this.





              Off the top of my here, here's a few design patterns that they do make use of:



              Integer, Long and Byte make use of an object pool of flyweight objects, to avoid creating unnecessary instances.



              Boolean somewhat tries to be a multiton (in that the constructor is deprecated) but in practice it isn't.






              share|improve this answer





















              • all Wrapper classes constructor are deprecated in java 9 as docs.oracle.com/javase/9/docs/api/?java/lang/Integer.html
                – user7294900
                2 days ago












              • @user7294900 Sure. What's your point?
                – Michael
                2 days ago










              • You wrote the note specific for Boolean
                – user7294900
                2 days ago










              • @user7294900 Because that's the only one which is (sort of) a multiton (Boolean.TRUE and Boolean.FALSE).
                – Michael
                2 days ago















              up vote
              1
              down vote










              up vote
              1
              down vote









              They don't follow any of the design patterns that you have mentioned.



              Adapter converts the interface of a class to another interface. Primitives do not implement any interfaces.



              Decorator adds behaviour of to a class implementing one interface by wrapping it in another that implements the same interface. Primitives do not implement any interfaces.



              A facade's purpose is to mask the complex behaviour of the object that it's wrapping. There is nothing less complex in a programming language than a primitive. The clue's in the name. If anything, the wrapper classes are the opposite of this.





              Off the top of my here, here's a few design patterns that they do make use of:



              Integer, Long and Byte make use of an object pool of flyweight objects, to avoid creating unnecessary instances.



              Boolean somewhat tries to be a multiton (in that the constructor is deprecated) but in practice it isn't.






              share|improve this answer












              They don't follow any of the design patterns that you have mentioned.



              Adapter converts the interface of a class to another interface. Primitives do not implement any interfaces.



              Decorator adds behaviour of to a class implementing one interface by wrapping it in another that implements the same interface. Primitives do not implement any interfaces.



              A facade's purpose is to mask the complex behaviour of the object that it's wrapping. There is nothing less complex in a programming language than a primitive. The clue's in the name. If anything, the wrapper classes are the opposite of this.





              Off the top of my here, here's a few design patterns that they do make use of:



              Integer, Long and Byte make use of an object pool of flyweight objects, to avoid creating unnecessary instances.



              Boolean somewhat tries to be a multiton (in that the constructor is deprecated) but in practice it isn't.







              share|improve this answer












              share|improve this answer



              share|improve this answer










              answered 2 days ago









              Michael

              17.7k73167




              17.7k73167












              • all Wrapper classes constructor are deprecated in java 9 as docs.oracle.com/javase/9/docs/api/?java/lang/Integer.html
                – user7294900
                2 days ago












              • @user7294900 Sure. What's your point?
                – Michael
                2 days ago










              • You wrote the note specific for Boolean
                – user7294900
                2 days ago










              • @user7294900 Because that's the only one which is (sort of) a multiton (Boolean.TRUE and Boolean.FALSE).
                – Michael
                2 days ago




















              • all Wrapper classes constructor are deprecated in java 9 as docs.oracle.com/javase/9/docs/api/?java/lang/Integer.html
                – user7294900
                2 days ago












              • @user7294900 Sure. What's your point?
                – Michael
                2 days ago










              • You wrote the note specific for Boolean
                – user7294900
                2 days ago










              • @user7294900 Because that's the only one which is (sort of) a multiton (Boolean.TRUE and Boolean.FALSE).
                – Michael
                2 days ago


















              all Wrapper classes constructor are deprecated in java 9 as docs.oracle.com/javase/9/docs/api/?java/lang/Integer.html
              – user7294900
              2 days ago






              all Wrapper classes constructor are deprecated in java 9 as docs.oracle.com/javase/9/docs/api/?java/lang/Integer.html
              – user7294900
              2 days ago














              @user7294900 Sure. What's your point?
              – Michael
              2 days ago




              @user7294900 Sure. What's your point?
              – Michael
              2 days ago












              You wrote the note specific for Boolean
              – user7294900
              2 days ago




              You wrote the note specific for Boolean
              – user7294900
              2 days ago












              @user7294900 Because that's the only one which is (sort of) a multiton (Boolean.TRUE and Boolean.FALSE).
              – Michael
              2 days ago






              @user7294900 Because that's the only one which is (sort of) a multiton (Boolean.TRUE and Boolean.FALSE).
              – Michael
              2 days ago












              up vote
              1
              down vote













              Wrapper classes use composition. The same composition as in the popular maxim, "Favor composition over inheritance." Composition is not a design pattern; however, most OO design patterns use composition as part of their implementation. This is one reason many people struggle to discriminate among different design patterns: the common use of composition makes them all appear the same to a certain degree.



              There are two basic parts in a composition relationship: the composer and the composed. You can think of this generally as a part/whole relationship. It may be one-to-one or one-to-many. A wrapper is the composer, i.e. it is the whole. It may wrap one or more composed parts.



              Many different design patterns make use of the general composition relationship for different purposes. Many of those different patterns are referred to collectively as "wrappers". The GoF book calls out at least two such patterns.






              • ADAPTER Also Known As Wrapper page 139


              • DECORATOR Also Known As Wrapper page 175




              In summary, Wrapper is not any single design pattern; rather, it is a category of design patterns. Incidentally, we see the same dynamic with the term Factory. There is no single design pattern named Factory; rather, it is a category of design patterns.






              share|improve this answer

























                up vote
                1
                down vote













                Wrapper classes use composition. The same composition as in the popular maxim, "Favor composition over inheritance." Composition is not a design pattern; however, most OO design patterns use composition as part of their implementation. This is one reason many people struggle to discriminate among different design patterns: the common use of composition makes them all appear the same to a certain degree.



                There are two basic parts in a composition relationship: the composer and the composed. You can think of this generally as a part/whole relationship. It may be one-to-one or one-to-many. A wrapper is the composer, i.e. it is the whole. It may wrap one or more composed parts.



                Many different design patterns make use of the general composition relationship for different purposes. Many of those different patterns are referred to collectively as "wrappers". The GoF book calls out at least two such patterns.






                • ADAPTER Also Known As Wrapper page 139


                • DECORATOR Also Known As Wrapper page 175




                In summary, Wrapper is not any single design pattern; rather, it is a category of design patterns. Incidentally, we see the same dynamic with the term Factory. There is no single design pattern named Factory; rather, it is a category of design patterns.






                share|improve this answer























                  up vote
                  1
                  down vote










                  up vote
                  1
                  down vote









                  Wrapper classes use composition. The same composition as in the popular maxim, "Favor composition over inheritance." Composition is not a design pattern; however, most OO design patterns use composition as part of their implementation. This is one reason many people struggle to discriminate among different design patterns: the common use of composition makes them all appear the same to a certain degree.



                  There are two basic parts in a composition relationship: the composer and the composed. You can think of this generally as a part/whole relationship. It may be one-to-one or one-to-many. A wrapper is the composer, i.e. it is the whole. It may wrap one or more composed parts.



                  Many different design patterns make use of the general composition relationship for different purposes. Many of those different patterns are referred to collectively as "wrappers". The GoF book calls out at least two such patterns.






                  • ADAPTER Also Known As Wrapper page 139


                  • DECORATOR Also Known As Wrapper page 175




                  In summary, Wrapper is not any single design pattern; rather, it is a category of design patterns. Incidentally, we see the same dynamic with the term Factory. There is no single design pattern named Factory; rather, it is a category of design patterns.






                  share|improve this answer












                  Wrapper classes use composition. The same composition as in the popular maxim, "Favor composition over inheritance." Composition is not a design pattern; however, most OO design patterns use composition as part of their implementation. This is one reason many people struggle to discriminate among different design patterns: the common use of composition makes them all appear the same to a certain degree.



                  There are two basic parts in a composition relationship: the composer and the composed. You can think of this generally as a part/whole relationship. It may be one-to-one or one-to-many. A wrapper is the composer, i.e. it is the whole. It may wrap one or more composed parts.



                  Many different design patterns make use of the general composition relationship for different purposes. Many of those different patterns are referred to collectively as "wrappers". The GoF book calls out at least two such patterns.






                  • ADAPTER Also Known As Wrapper page 139


                  • DECORATOR Also Known As Wrapper page 175




                  In summary, Wrapper is not any single design pattern; rather, it is a category of design patterns. Incidentally, we see the same dynamic with the term Factory. There is no single design pattern named Factory; rather, it is a category of design patterns.







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered yesterday









                  jaco0646

                  4,36652345




                  4,36652345






















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