title: Read From JSON File and after adding a property to that object write back to it
body: <p>I have an empty json file in my java project with only json object bracket:- that is</p>
  
  <p>a.json</p>
  
  <pre><code>{}
  </code></pre>
  
  <p>i want to read from it and after adding a key value write back to it,
  that is:-</p>
  
  <pre><code>{"a":"a"}
  </code></pre>
  
  <p>Is there any Json Library i can use to do so.</p>
  
  <p>I don't wanna use simple FileReaders and FileWriters in java to read and write.</p>