How to parse JSON File with json.org/java libraries?

File f = new File("output.json");

FileReader fr = new FileReader(f);

BufferedReader br = new BufferedReader(fr);

StringBuffer sb = new StringBuffer();

String eachLine = br.readLine();

while (eachLine != null) {

   sb.append(eachLine);

   eachLine = br.readLine();

}

String readFile = sb.toString();

System.out.println("output = "+readFile);

JSONObject output = new JSONObject(readFile);

System.out.println("output jsonobject = "+output.toString());
File f = new File("output.json");

FileReader f