Java Fundamentals Hardening the DateFormat of the 92:dateformat class to achieve the conversion of dates and strings

1. DateFormat class overview:

DateFormat is an abstract class of date/time formatting subclasses that formats and resolves dates or times in a language-independent manner. is an abstract class, so use its subclasses SimpleDateFormat

2. SimpleDateFormat Construction Method:

1  Public SimpleDateFormat () 2  Public SimpleDateFormat (String pattern)

3. Member Methods

1  Public Final String Format (date date) 2  Public Date Parse (String source)

4. code example:

1  Packagecn.itcast_03;2 3 Importjava.text.ParseException;4 ImportJava.text.SimpleDateFormat;5 Importjava.util.Date;6 7 /*8 * Date--String (formatted)9 * Public Final String format (date date)Ten  *  One * String--Date (parse) A * Public Date Parse (String source) -  *  - * Dateforamt: the date and string can be formatted and parsed, but because it is an abstract class, the specific subclass SimpleDateFormat is used.  the  *  - * Construction method of SimpleDateFormat: - * SimpleDateFormat (): Default mode - * SimpleDateFormat (String pattern): given pattern + * How to write this pattern string? - * By looking at the API, we find the corresponding pattern + * Year y A * Month M at * Day D - * Hours H - * min M - * seconds S -  *  - * December 12, 2014 12:12:12 in  */ -  Public classDateformatdemo { to      Public Static voidMain (string[] args)throwsParseException { +         //Date--String -         //Create Date Object theDate d =NewDate (); *         //creating a formatted object $         //SimpleDateFormat sdf = new SimpleDateFormat ();Panax Notoginseng         //given pattern -SimpleDateFormat SDF =NewSimpleDateFormat ("yyyy mm month DD Day HH:MM:SS"); the         //Public Final String format (date date) +String s =Sdf.format (d); A System.out.println (s); the          +          -         //String--Date $String str = "2008-08-08 12:12:12"; $         //when parsing a string into a date, be aware that the format must match the given string format  -SimpleDateFormat SDF2 =NewSimpleDateFormat ("Yyyy-mm-dd HH:mm:ss"); -Date DD =sdf2.parse (str); the System.out.println (DD); -     }Wuyi}

The results of the operation are as follows:

Java Fundamentals Hardening the DateFormat of the 92:dateformat class to achieve the conversion of dates and strings