convert date month and year into word using java

import java.util.*;
import java.text.*;

public class DateToWords {
        String string;
        String st1[] = { "", "one", "two", "three", "four", "five", "six", "seven",
                        "eight", "nine", };
        String st2[] = { "hundred", "thousand"};
        String st3[] = { "ten", "eleven", "twelve", "thirteen", "fourteen",
                        "fifteen", "sixteen", "seventeen", "eighteen", "ninteen", };
        String st4[] = { "twenty", "thirty"};

        public String getMonth(int month) {
           return new DateFormatSymbols().getMonths()[month-1];
        }

        public String convert(int number) {
                int n = 1;
                int word;
                string = "";
                while (number != 0) {
                        switch (n) {
                        case 1:
                                word = number % 100;
                                pass(word);
                                if (number > 100 && number % 100 != 0) {
                                        show("and ");
                                }
                                number /= 100;
                                break;

                        case 2:
                                word = number % 10;
                                if (word != 0) {
                                        show(" ");
                                        show(st2[0]);
                                        show(" ");
                                        pass(word);
                                }
                                number /= 10;
                                break;

                        case 3:
                                word = number % 100;
                                if (word != 0) {
                                        show(" ");
                                        show(st2[1]);
                                        show(" ");
                                        pass(word);
                                }
                                number /= 100;
                                break;

                        case 4:
                                word = number % 100;
                                if (word != 0) {
                                        show(" ");
                                        show(st2[2]);
                                        show(" ");
                                        pass(word);
                                }
                                number /= 100;
                                break;

                        case 5:
                                word = number % 100;
                                if (word != 0) {
                                        show(" ");
                                        show(st2[3]);
                                        show(" ");
                                        pass(word);
                                }
                                number /= 100;
                                break;

                        }
                        n++;
                }
                return string;
        }

continue....

public void pass(int number) {
                int word, q;
                if (number < 10) {
                        show(st1[number]);
                }
                if (number > 9 && number < 20) {
                        show(st3[number - 10]);
                }
                if (number > 19) {
                        word = number % 10;
                        if (word == 0) {
                                q = number / 10;
                                show(st4[q - 2]);
                        } else {
                                q = number / 10;
                                show(st1[word]);
                                show(" ");
                                show(st4[q - 2]);
                        }
                }
        }

        public void show(String s) {
                String st;
                st = string;
                string = s;
                string += st;
        }

        public static void main(String[] args) {
                DateToWords num = new DateToWords();
                  SimpleDateFormat dateFormatter = new SimpleDateFormat("dd/MM/yyyy");
                  ParsePosition parsePosition = new ParsePosition(0);
                  Calendar cal = Calendar.getInstance();
                  cal.setTime(dateFormatter.parse("26/3/2012",new ParsePosition(0)));
                  int day  = cal.get(Calendar.DATE);
                  int month  = cal.get(Calendar.MONTH) + 1;
                  int year = cal.get(Calendar.YEAR);
                  System.out.println(num.convert(day)+" "+num.getMonth(month)+" "+num.convert(year));
        }
}