1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61
| package format;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Formatter {
public static void main(String[] args) {
System.out.println(format("/", "03"));;
System.out.println(format("/", "03 01"));;
System.out.println(format("/", "03 2006"));;
System.out.println(format("/", "03 01 2007"));;
System.out.println(format("/", "2007"));;
}
private static Pattern pDay = Pattern.compile("\\s*(\\d{2})\\s*");
private static Pattern pYear = Pattern.compile("\\s*(\\d{4})\\s*");
private static Pattern pDayMonthOrYear = Pattern.compile("\\s*(\\d{2})\\s+(\\d{2}|\\d{4})\\s*");
private static Pattern pDayMonthYear = Pattern.compile("\\s*(\\d{2})\\s+(\\d{2})\\s+(\\d{4})\\s*");
private static String format(String sep, String fields) {
Matcher m = null;
String day = "";
String month = "";
String year = "";
m = pDay.matcher(fields);
if (m.matches()) {
day = m.group(1);
return format(day, month, year, sep);
}
m = pYear.matcher(fields);
if (m.matches()) {
year = m.group(1);
return format(day, month, year, sep);
}
m = pDayMonthOrYear.matcher(fields);
if (m.matches()) {
if (m.group(2).length()==2) {
day = m.group(1);
month = m.group(2);
} else {
month = m.group(1);
year = m.group(2);
}
return format(day, month, year, sep);
}
m = pDayMonthYear.matcher(fields);
if (m.matches()) {
day = m.group(1);
month = m.group(2);
year = m.group(3);
return format(day, month, year, sep);
}
return format("", "", "", sep);
}
private static String format(String day, String month, String year, String sep) {
return day + sep + month + sep + year;
}
} |
Partager