2017-05-03 19:48:29 +02:00
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---
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layout: pattern
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title: Marker Interface
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folder: marker
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permalink: /patterns/marker/
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2019-12-13 21:09:28 +02:00
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categories: Structural
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2021-05-19 10:49:05 -06:00
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language: en
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2017-05-03 19:48:29 +02:00
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tags:
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2019-12-13 21:09:28 +02:00
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- Decoupling
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2017-05-03 19:48:29 +02:00
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---
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## Intent
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2017-05-23 01:38:02 +02:00
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Using empty interfaces as markers to distinguish special treated objects.
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2017-05-03 19:48:29 +02:00
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2019-12-07 20:01:13 +02:00
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## Class diagram
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2017-05-03 19:49:25 +02:00
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2017-05-03 19:48:29 +02:00
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## Applicability
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Use the Marker Interface pattern when
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2017-05-23 01:38:02 +02:00
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* you want to identify the special objects from normal objects (to treat them differently)
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* you want to mark that some object is available for certain sort of operations
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2017-05-03 19:48:29 +02:00
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## Real world examples
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2017-05-23 01:38:02 +02:00
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* [javase.8.docs.api.java.io.Serializable](https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html)
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* [javase.8.docs.api.java.lang.Cloneable](https://docs.oracle.com/javase/8/docs/api/java/lang/Cloneable.html)
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2017-05-03 19:48:29 +02:00
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## Credits
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2020-07-06 13:31:07 +03:00
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* [Effective Java](https://www.amazon.com/gp/product/0134685997/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0134685997&linkCode=as2&tag=javadesignpat-20&linkId=4e349f4b3ff8c50123f8147c828e53eb)
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