title: Add Json file contents to JsonObject in Java
body: <p>I have a Json file <code>E:\\jsondemo.json</code> in disk. I want to create JSONObject in Java and add the contents of the json file to JSONObject. How it is possible?</p>
  
  <pre><code>JSONObject jsonObject = new JSONObject();
  </code></pre>
  
  <p>After creating this objec, what should i do to read the file and put values in <strong>jsonObject</strong>
  Thanks.</p>