Added real world example for Chain
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@ -287,6 +287,7 @@ A programming idiom is a means of expressing a recurring construct in one or mor
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**Real world examples:**
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* [java.util.logging.Logger#log()](http://docs.oracle.com/javase/8/docs/api/java/util/logging/Logger.html#log%28java.util.logging.Level,%20java.lang.String%29)
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* [Apache Commons Chain](https://commons.apache.org/proper/commons-chain/index.html)
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## <a name="command">Command</a> [↑](#list-of-design-patterns)
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**Intent:** Encapsulate a request as an object, thereby letting you parameterize clients with different requests, queue or log requests, and support undoable operations.
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