Possible ways of creating json string dynamicaly

HI,
Currently in my code i am creating a json string like :

        String json = "{\"text\" : \""+text+"\"}";

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For just this small json i dont want to include any library like Gson or....etc...

what are the possible ways in which i can make the above json...probably avoiding these quotes as much as possible and using a variable in between as it is error prone.

Thanks