title: How can I parse the string to Double
body: <p>I want to parse 78 into double variable where 78 is stored as a String</p>
  
  <p>I used below code to parse. </p>
  
  <pre><code>Double.parseDouble(78);
  </code></pre>
  
  <p>It display's Exception Error java.lang.NumberFormatException</p>
  
  <p>Plz tell me How can I parse String 78 into double </p>