public Month(int month,int year){
  if ((month < 1) || (month > 12)) {
    throw new IllegalArgumentException("Month outside valid range.");
  }
  this.month=month;
  this.year=year;
  peg(Calendar.getInstance());
}

public Month ( int month , int year ) { if ( ( month < 1 ) || ( month > 12 ) ) { throw new IllegalArgumentException ( "Month outside valid range." ) ; } this . month = month ; this . year = year ; peg ( Calendar . getInstance ( ) ) ; }
constructs a new month instance .
