Description: JSONArray is a class in the org.json package that represents an array of JSON objects. It provides methods to get and set values in the array, as well as to check if an array is null.
Description: This code creates a new JSON array with three values: "apple", 3, and null. It then uses the isNull method to check if the third value is null, which it is, so it returns true.
Package Library: The package library used in this example is org.json.
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