Answer 1

https://www.oracle.com/technical-resources/articles/java/json.html

https://www.baeldung.com/java-org-json

https://www.google.com/amp/s/howtodoinjava.com/library/json-simple-read-write-json-examples/amp/

https://ourcodeworld.com/articles/read/69/how-to-return-a-json-object-from-java-to-javascript-cordova-