Converting JSONObject to HashMap<>

Today, I had a huge Json in my app and I wanted to fetch all these values in a general way. I also wanted to parse Json for only one time to avoid try/catch each time I access any value. So, first thing I had in mind was to convert the JSONObject in the HashMap or Map<> etc. So if you are using Gson in your apps for json mapping, then you can use this one line code for conversion.

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