@Override public void roll(int field,boolean increment){
  roll(field,increment ? 1 : -1);
}

@ Override public void roll ( int field , boolean increment ) { roll ( field , increment ? 1 : - 1 ) ; }
increments or decrements the specified field and wraps the value of the field when it goes beyond the maximum or minimum value for the current date . other fields will be adjusted as required to maintain a consistent date . for example , march 31 will roll to april 30 when rolling the month field .
