public class Days {
   public static String[] days = { "",
    "a partridge in a pear tree.",
    "two turtle doves,",
    "three french hens,",
    "four calling birds,",
    "five gold rings,",
    "six geese a-laying,", 
    "seven swans a-swimming,",
    "eight maids a-milking,",
    "nine ladies dancing,",
    "ten lords a-leaping,",
    "eleven pipers piping,",
    "twelve drummers drumming,"};

   public static String[] numbers = {"",
    "first", "second", "third", "fourth", "fifth", "sixth",
    "seventh", "eighth", "ninth", "tenth", "eleventh", "twelfth"};

   public static void main(String[] args) {
      for (int i = 1; i <= 12; i++) {
         System.out.println("On the " + numbers[i] +
            " day of Christmas my true love gave to me");
         for (int j = i; j >= 1; j--) {
            if (i != 1 && j == 1) System.out.print("and ");
            System.out.println(days[j]);
         }
         System.out.println();
      }
   }
}

On the first day of Christmas my true love gave to me
a partridge in a pear tree.

On the second day of Christmas my true love gave to me
two turtle doves,
and a partridge in a pear tree.

On the third day of Christmas my true love gave to me
three french hens,
two turtle doves,
and a partridge in a pear tree.

On the fourth day of Christmas my true love gave to me
four calling birds,
three french hens,
two turtle doves,
and a partridge in a pear tree.

On the fifth day of Christmas my true love gave to me
five gold rings,
four calling birds,
three french hens,
two turtle doves,
and a partridge in a pear tree.

On the sixth day of Christmas my true love gave to me
six geese a-laying,
five gold rings,
four calling birds,
three french hens,
two turtle doves,
and a partridge in a pear tree.

On the seventh day of Christmas my true love gave to me
seven swans a-swimming,
six geese a-laying,
five gold rings,
four calling birds,
three french hens,
two turtle doves,
and a partridge in a pear tree.

On the eighth day of Christmas my true love gave to me
eight maids a-milking,
seven swans a-swimming,
six geese a-laying,
five gold rings,
four calling birds,
three french hens,
two turtle doves,
and a partridge in a pear tree.

On the ninth day of Christmas my true love gave to me
nine ladies dancing,
eight maids a-milking,
seven swans a-swimming,
six geese a-laying,
five gold rings,
four calling birds,
three french hens,
two turtle doves,
and a partridge in a pear tree.

On the tenth day of Christmas my true love gave to me
ten lords a-leaping,
nine ladies dancing,
eight maids a-milking,
seven swans a-swimming,
six geese a-laying,
five gold rings,
four calling birds,
three french hens,
two turtle doves,
and a partridge in a pear tree.

On the eleventh day of Christmas my true love gave to me
eleven pipers piping,
ten lords a-leaping,
nine ladies dancing,
eight maids a-milking,
seven swans a-swimming,
six geese a-laying,
five gold rings,
four calling birds,
three french hens,
two turtle doves,
and a partridge in a pear tree.

On the twelfth day of Christmas my true love gave to me
twelve drummers drumming,
eleven pipers piping,
ten lords a-leaping,
nine ladies dancing,
eight maids a-milking,
seven swans a-swimming,
six geese a-laying,
five gold rings,
four calling birds,
three french hens,
two turtle doves,
and a partridge in a pear tree.