package org.checkstyle.suppressionxpathfilter.unnecessarynullcheckwithinstanceof;
   
   public class InputXpathUnnecessaryNullCheckWithInstanceOf {
       public void methodWithUnnecessaryNullCheck1(Object obj) {
           if (obj != null && obj instanceof String) { // warn
               String str = (String) obj;
           }
       }
   }