Java Fundamentals Hardening 93: Date Tool class authoring and test Cases

1. dateutil. Java, the code is as follows:

1  Packagecn.itcast_04;2 3 Importjava.text.ParseException;4 ImportJava.text.SimpleDateFormat;5 Importjava.util.Date;6 7 /**8 * This is the tool class for converting dates and strings to each other9  * Ten  * @authorWind One  */ A  Public classDateutil { -     PrivateDateutil () { -     } the  -     /** - * The function of this method is to turn the date into a string -      *  +      * @paramD - * Converted Date Object +      * @paramformat A * Pass over the format to be converted at      * @returnformatted string -      */ -      Public Staticstring datetostring (Date D, string format) { -         //SimpleDateFormat sdf = new SimpleDateFormat (format); -         //return Sdf.format (d); -         return NewSimpleDateFormat (format). Format (d); in     } -  to     /** + * The function of this method is to parse a string into a Date object -      *  the      * @params * * Parsed string $      * @paramformatPanax Notoginseng * Pass over the format to be converted -      * @returnResolved Date Object the      * @throwsparseexception +      */ A      Public StaticDate stringtodate (string s, string format) the             throwsParseException { +         return NewSimpleDateFormat (format). Parse (s); -     } $}

2. Dateutildemo. Java, as follows:

1  Packagecn.itcast_04;2 3 Importjava.text.ParseException;4 Importjava.util.Date;5 6 /*7 * Test of Tool class8  */9  Public classDateutildemo {Ten      Public Static voidMain (string[] args)throwsParseException { OneDate d =NewDate (); A         //YYYY-MM-DD HH:mm:ss -String s = dateutil.datetostring (d, "yyyy mm month DD Day HH:MM:SS"); - System.out.println (s); the  -String s2 = dateutil.datetostring (d, "yyyy mm month DD Day"); - System.out.println (S2); -  +String s3 = dateutil.datetostring (D, "HH:mm:ss"); - System.out.println (S3); +  AString str = "2014-10-14"; atDate dd = dateutil.stringtodate (str, "YYYY-MM-DD"); - System.out.println (DD); -     } -}

The results of the test run are as follows:

Java Fundamentals Hardening 93: Date Tool class authoring and test Cases