Check if two calendar objects represent the same local time in Java

/*from   w w  w.  java2  s.  c  om*/
import java.util.Calendar;

public class Main {
  public static void main(String[] argv) {
    System.out.println(isSameLocalTime(Calendar.getInstance(),
        Calendar.getInstance()));
  }

  public static boolean isSameLocalTime(Calendar cal1, Calendar cal2) {
    if (cal1 == null || cal2 == null) {
      throw new IllegalArgumentException("The date must not be null");
    }
    return (cal1.get(Calendar.MILLISECOND) == cal2.get(Calendar.MILLISECOND)
        && cal1.get(Calendar.SECOND) == cal2.get(Calendar.SECOND)
        && cal1.get(Calendar.MINUTE) == cal2.get(Calendar.MINUTE)
        && cal1.get(Calendar.HOUR) == cal2.get(Calendar.HOUR)
        && cal1.get(Calendar.DAY_OF_YEAR) == cal2.get(Calendar.DAY_OF_YEAR)
        && cal1.get(Calendar.YEAR) == cal2.get(Calendar.YEAR)
        && cal1.get(Calendar.ERA) == cal2.get(Calendar.ERA) && cal1.getClass() == cal2
        .getClass());
  }
}