Java by API/java.lang/Number

Number.class

   <source lang="java">

public class DynamicTypeChecking {

 public static void main(final String[] args) {
   new Integer("0").getClass().isInstance(new Double("1.2").getClass());
   Number.class.isInstance(123);
   Number.class.isAssignableFrom(new Double("1.2").getClass());
 }

}

      </source>