The optString method in the org.json package library of Java is used to get the string value of a key in a JSONObject.
Example: JSONObject obj = new JSONObject("{ \"name\":\"John\", \"id\":1 }"); String name = obj.optString("name", "default_value"); In this example, the optString method is used to get the string value of the key "name" in the JSONObject. If the key is not found in the JSONObject, it returns the default value "default_value".
Another example: JSONObject obj = new JSONObject(); obj.put("name", "John"); String name = obj.optString("name"); In this example, the optString method is used to get the string value of the key "name" in the JSONObject. It returns "John" since "name" key is found in the JSONObject.
The org.json package library is a Java library for working with JSON data. It provides classes to encode and decode JSON objects, as well as methods to manipulate JSON data.
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