The `put` method in the `com.alibaba.fastjson.JSONObject` class is a method in the Alibaba FastJSON library for Java. It is used to add a key-value pair to a JSON object. The method takes two parameters, a key of type `String` and a value of any type, and adds them as a new entry to the JSON object. This allows for dynamically updating and modifying the contents of a JSON object during runtime.
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