String.Format () "demonstrates specific examples to illustrate"

String.Format () "Demo sample specific explanation"

Finishing by: Vashon

Objective:

String.FormatAs a text processing tool. Provides us with a powerful and rich string formatting function, in order to not stop at the simple callString.Format ("Hello%s", "Vashon");

, keep your notes organized and documented below.

Method overloads:

// format a string using the current local region object (Locale.getdefault ()) string String.Format (String fmt, Object ... args); // define your own local area object format string String String.Format (locale locale, String fmt, Object ... args);

Demo Sample Specific Explanation:

Import Java.util.date;import Java.util.Locale; Import Org.junit.Test; public class StringFormat {/**string.format () uses Method 1, translator%s: String type, such as: "HQL"%b: Boolean type, such as: true%d: integer type (decimal), such as: 99%f: Floating-point type, such as: 99.99%: Percent type.    such as:%%n: newline character */@Testpublic void test1 () {String str=null; Str=string.format ("Hi,%s", "Mr. Yang"); Formatted string System.out.println (str);    Output string variable str content System.out.printf ("3>7 result is:%b%n", 3>7);    System.out.printf ("Half of 100 is:%d%n", 100/2);    System.out.printf ("50 yuan book 8.5 discount is:%f Yuan%n", 50*0.85); System.out.printf ("The above discount is%d%%%n", 85);} /*2, Common datetime formatting C: Contains all date and time information week Liuxing 14:21:20 CST 2007F: "Year-month-day" format, such as: 2007-10-27d: "Month/day/year" format, such as: 10/27/07r: "HH:MM:SS PM" format (12 o'clock), such as: 02:25:51 PM T: "HH:MM:SS" format (24 o'clock), such as: 14:28:16r: "hh:mm" format (24 o'clock), such as: 14:28 */@Testpublic void Test2 () {Date date=n EW Date ();    Create Date Object System.out.printf ("All date and time information:%tc%n", date);//Format output date or time System.out.printf ("year-month-day format:%tf%n", date);    SYSTEM.OUT.PRINTF ("Month/day/year format:%td%n", date); System.out.printf ("HH:MM:SS PM format (12 o'clock):%tR%n ", date);    System.out.printf ("HH:MM:SS format (24 o'clock):%tt%n", date); System.out.printf ("hh:mm format (24 o'clock):%tr%n", date);} /*3, Format date string B or H: month abbreviation. As in: October English: Oct B: Full month, as in: October English: October A: The abbreviation of the week, such as: Saturday English: Sat A: The full name of the week, such as: Middle: Saturday: Saturday C: The first two digits of the year (less than two bits before 0), such as: 20y: two digits (not 0), such as: 07y:4 digit year (less than 4 bits in front of 0), such as: 2007j: The number of Days of the year (the Day of the year), such as: two-digit month (less than two digits before 0).                                              such as: 10d: Two digits of the day (less than two bits before 0), such as: 27e: The Day of the month (the front does not fill 0), such as: 5 */@Testpublic void Test3 () {date date=new date ();      Create Date Object String Str=string.format (locale.us, "English month Abbreviation:%TB", date);                                                                              Format Date string System.out.println (str);    Output string content System.out.printf ("Local month abbreviation:%tb%n", date);    Str=string.format (locale.us, "English month Full name:%TB", date);    System.out.println (str);    System.out.printf ("Local Month full name:%tb%n", date);    Str=string.format (locale.us, "English week Abbreviation:%ta", date);    System.out.println (str);    System.out.printf ("Local week abbreviation:%ta%n", date); System.out.prinTF ("The first two digits of the year (less than two bits before 0):%tc%n", date);    System.out.printf ("the latter two digits of the year (less than two bits before 0):%ty%n", date);    System.out.printf ("Number of days in the Year" (The Day of the year):%tj%n ", date);    System.out.printf ("Two digits of the month (less than two bits before 0):%tm%n", date);    System.out.printf ("Two digits of the day (less than two bits in front of 0):%td%n", date); System.out.printf ("Day of the month (not before 0):%te", date);} /*4, Format time string H: 2-digit 24 o'clock hour (less than 2 bits in front of 0). such as: 15i:2 digit 12 o'clock hours (less than 2 bits in front of 0), such as: 03k:2 digit 24 o'clock hours (front does not fill 0), such as: 15l:2 digit 12 o'clock hour (front does not fill 0), such as: 3m:2 digits of the minute (less than 2 bits before 0). such as: 03s:2 digit seconds (less than 2 bits in front of 0), such as: 09l:3 digit milliseconds (less than 3 bits in front of 0), such as: 015n:9 bit number of milliseconds (less than 9 bits before 0). such as: 562000000 P: Small Letter of the morning or afternoon mark. For example: Mid-afternoon: PM Z: Offset from RFC822 time zone relative to GMT, such as: +0800z: Time zone abbreviation string, such as: Csts:1970-1-1 00:00:00 to now the number of seconds elapsed, such as: 1193468128q:1970-1-1                               00:00:00 to now the number of milliseconds elapsed, such as: 1193468128984 */@Testpublic void test4 () {date date=new date ();    Create Date Object System.out.printf ("2-digit 24 o'clock hour (less than 2 bits before 0):%th%n", date);    System.out.printf ("2-digit 12 o'clock hour (less than 2 bits in front 0):%ti%n", date);    System.out.printf ("2-digit 24 o'clock hour (front not 0):%tk%n", date); System.out.printf ("2-digit 12 o'clock hour (not before 0):%tl%n", date);    System.out.printf ("2 digits in minutes (less than 2 bits before 0):%tm%n", date);    System.out.printf ("2 digit seconds (less than 2 bits in front of 0):%ts%n", date);    System.out.printf ("3 digits in milliseconds (less than 3 bits before 0):%tl%n", date);    System.out.printf ("9 digits in milliseconds (less than 9 bits in front of 0):%tn%n", date);    String Str=string.format (locale.us, "small letter morning or afternoon mark (English):%TP", date);                          System.out.println (str);    Output string Variable str contents System.out.printf ("lowercase letter of the morning or afternoon mark (medium):%tp%n", date);    System.out.printf ("Offset from RFC822 time zone relative to GMT:%tz%n", date);    System.out.printf ("time zone abbreviation string:%tz%n", date);    System.out.printf ("1970-1-1 00:00:00 today's number of seconds passed:%ts%n", date);   System.out.printf ("1970-1-1 00:00:00 the number of milliseconds today has elapsed:%tq%n", date); }}

String.Format () "demonstrates specific examples to illustrate"