title: Checking if a number is an Integer in Java
body: <p>Is there any method or quick way to check whether a number is an Integer (belongs to Z field) in Java?</p>
  
  <p>I thought of maybe subtracting it from the rounded number, but I didn't find any method that will help me with this.</p>
  
  <p>Where should I check? Integer Api?</p>