title: How to check null condition for the boolean variable
body: <p>I have a class as shown </p>
  
  <pre><code>package com;
  
  public class Person {
  boolean registered;
  
  public boolean isRegistered() {
      return registered;
  }
  
  public void setRegistered(boolean registered) {
      this.registered = registered;
  }
  }
  </code></pre>
  
  <p>The Data to Person Object will be set based on the Data present in DB . 
  The problem is that for older records the registered filed is not present . </p>
  
  <p>so i how can i test if the filed is present or not ??</p>
  
  <p>package com;</p>
  
  <pre><code>public class Test {
  
      public static void main(String args[]) {
          Person per = new Person();
  
          if (per.isRegistered()) {
  
          }
      }
  
  }
  </code></pre>
  
  <p>How can i check if the per.isRegistered() field is present or not for that Person Object  ??</p>