Summary of String Conversion into time format in Java

There is such a string: "20070911121547 ",

Converted to time format: 12:15:47

Java Code

2. Public Class Bb {
4. Public Static Void Main (string [] ARGs ){
6. // Todo auto-generated method stub
8. Simpledateformat df =New Simpledateformat ("Yyyymmddhhmmss");
10. String datestring ="20071128175545";
12. Try {
14. Date = DF. parse (datestring );
16. System. Out. println (DF. Format (date ));
18. }Catch (Exception ex ){
20. System. Out. println (ex. getmessage ());
22. }
24. }
26. }

 
Public Class BB {public static void main (string [] ARGs) {// todo auto-generated method stub simpledateformat df = new simpledateformat ("yyyymmddhhmmss "); string datestring = "20071128175545"; try {date = DF. parse (datestring); system. out. println (DF. format (date);} catch (exception ex) {system. out. println (ex. getmessage ());}}}
 

Time is nothing more than the string type to the time type, or the time type to the string type, there is the processing of the previous time, the next time, and so on.

I made an example myself:

Java Code

2. Package Com. Observe. monitoralarm. util;
4. Import Java. Text. parseexception;
6. Import Java. Text. simpledateformat;
8. Import Java. Util. calendar;
10. Import Java. Util. date;
12. /**
14. * Time help class
16. * @ Version $ ID: dateutil.Java, V 1.1 04:29:52 Linan exp $
18. * @ Author Linan
20. */
22. Public Class Dateutil {
24. Private Calendar calendar = calendar. getinstance ();
26. /**
28. * Obtain the current time, in the format of yyyy-mm-dd.
30. * @ Return
32. */
34. Public String getcurrentdate (){
36. Simpledateformat SDF =New Simpledateformat ("Yyyy-mm-dd");
38. Return SDF. Format (New Date ());
40. }
42. /**
44. * Get the current time, custom time format
46. * Y, M, D, H, M, minutes, seconds
48. * @ Param dateformat the time format displayed by the output
50. * @ Return
52. */
54. Public String getcurrentdate (string dateformat ){
56. Simpledateformat SDF =New Simpledateformat (dateformat );
58. Return SDF. Format (New Date ());
60. }
62. /**
64. * Format the date. The default date format is yyyy-mm-dd.
66. * @ Param date
68. * @ Return
70. */
72. Public String getformatdate (date ){
74. Simpledateformat SDF =New Simpledateformat ("Yyyy-mm-dd");
76. Return SDF. Format (date );
78. }
80. /**
82. * Date formatting: Custom output Date Format
84. * @ Param date
86. * @ Return
88. */
90. Public String getformatdate (date, string dateformat ){
92. Simpledateformat SDF =New Simpledateformat (dateformat );
94. Return SDF. Format (date );
96. }
98. /**
100. * Returns the previous time and date of the current date. amount is the time after the current time as a negative value before the current time.
102. * Default date format: yyyy-mm-dd
104. * @ Param field calendar Field
106. * Y, M, D, H, M, minutes, seconds
108. * @ Param amount quantity
110. * @ Return a date
112. */
114. Public String getpredate (string field,Int Amount ){
116. Calendar. settime (New Date ());
118. If(Field! =Null&&! Field. Equals ("")){
120. If(Field. Equals ("Y")){
122. Calendar. Add (calendar. Year, amount );
124. }Else If(Field. Equals ("M")){
126. Calendar. Add (calendar. Month, amount );
128. }Else If(Field. Equals ("D")){
130. Calendar. Add (calendar. day_of_month, amount );
132. }Else If(Field. Equals ("H")){
134. Calendar. Add (calendar. Hour, amount );
136. }
138. }Else{
140. Return Null;
142. }
144. Return Getformatdate (calendar. gettime ());
146. }
148. /**
150. * The previous date of a certain date
152. * @ Param D, a date
154. * @ Param field calendar Field
156. * Y, M, D, H, M, minutes, seconds
158. * @ Param amount quantity
160. * @ Return a date
162. */
164. Public String getpredate (date D, string field,Int Amount ){
166. Calendar. settime (d );
168. If(Field! =Null&&! Field. Equals ("")){
170. If(Field. Equals ("Y")){
172. Calendar. Add (calendar. Year, amount );
174. }Else If(Field. Equals ("M")){
176. Calendar. Add (calendar. Month, amount );
178. }Else If(Field. Equals ("D")){
180. Calendar. Add (calendar. day_of_month, amount );
182. }Else If(Field. Equals ("H")){
184. Calendar. Add (calendar. Hour, amount );
186. }
188. }Else{
190. Return Null;
192. }
194. Return Getformatdate (calendar. gettime ());
196. }
198. /**
200. * The previous time of a certain time
202. * @ Param date
204. * @ Return
206. * @ Throws parseexception
208. */
210. Public String getpredate (string date) Throws Parseexception {
212. Date d =New Simpledateformat (). parse (date );
214. String Pred = getpredate (D,"D",1);
216. Date predate =New Simpledateformat (). parse (Pred );
218. Simpledateformat SDF =New Simpledateformat ("Yyyy-mm-dd");
220. Return SDF. Format (predate );
222. }
224. }