How to save the json output in a String object.Duplicate data is written in all the splitted files?

I'm splitting the a Json file and writing each Json object to a separate file but I want to save each divided Json object to a string object. Not having any idea how to do it.

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.nio.charset.StandardCharsets;
import org.json.JSONArray;
import org.json.JSONObject;
import org.json.JSONTokener;

public class TweetTestStack {
public static void main(String[] args) throws Exception {
    String filePath = "/home/system5/Videos/Main.json";
    try (
            //BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(is)))
        BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(filePath), StandardCharsets.UTF_8))){
      //  BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(filePath), "UTF-8"))) {
        JSONTokener tokener = new JSONTokener(reader);
        JSONArray a = new JSONArray(tokener);

        for (int i = 0; i < a.length(); ++i) {
            flushFile((JSONObject) a.get(0), i);
        }
    }
}
 public static void flushFile(JSONObject obj, int d) throws Exception {
    try (FileOutputStream output = new FileOutputStream("/home/system5/Music/obj-" + d + ".json");
         Writer writer = new OutputStreamWriter(output, "UTF-8")) {
        obj.write(writer);
    }
}

}

sample file:

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