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                # 在 Java 中將`Date`轉換為`String` > 原文: [https://beginnersbook.com/2013/05/java-date-string-conversion/](https://beginnersbook.com/2013/05/java-date-string-conversion/) 我們之前看過,如何[在 Java](https://beginnersbook.com/2013/04/java-string-to-date-conversion/) 中將`String`轉換為`Date`。這篇文章是該文章的延續,在這里我們將學習 Java 中的`Date`到`String`轉換。 ## Java 代碼:將日期轉換為字符串 在本節之后,我已經共享了`Date`到`String`轉換的完整代碼。以下函數將`Date`轉換為`String`。在下面的函數中,我使用了格式`dd/MM/yyyy`,但是如果你想要任何其他格式的結果,那么你可以簡單地修改`SimpleDateFormat`中的模式。您也可以參考 Java 中關于[日期格式的文章之一](https://beginnersbook.com/2013/04/java-date-format/)。 **函數:** ```java public String convertStringToDate(Date indate) { String dateString = null; SimpleDateFormat sdfr = new SimpleDateFormat("dd/MMM/yyyy"); /*you can also use DateFormat reference instead of SimpleDateFormat * like this: DateFormat df = new SimpleDateFormat("dd/MMM/yyyy"); */ try{ dateString = sdfr.format( indate ); }catch (Exception ex ){ System.out.println(ex); } return dateString; } ``` ### 完成`Date`到`String`轉換的示例程序 在這個例子中,我將[當前日期](https://beginnersbook.com/2013/05/current-date-time-in-java/)作為輸入并轉換為`String`。為了獲得各種格式的輸出字符串,我在`SimpleDateFormat`中指定了不同的兩個模式。 ```java import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.Date; public class DateToStringDemo{ public static void main(String args[]) { Date todaysDate = new Date(); DateFormat df = new SimpleDateFormat("dd/MM/yyyy"); DateFormat df2 = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss"); DateFormat df3 = new SimpleDateFormat("dd-MMM-yyyy"); DateFormat df4 = new SimpleDateFormat("MM dd, yyyy"); DateFormat df5 = new SimpleDateFormat("E, MMM dd yyyy"); DateFormat df6 = new SimpleDateFormat("E, MMM dd yyyy HH:mm:ss"); try { //format() method Formats a Date into a date/time string. String testDateString = df.format(todaysDate); System.out.println("String in dd/MM/yyyy format is: " + testDateString); String str2 = df2.format(todaysDate); System.out.println("String in dd-MM-yyyy HH:mm:ss format is: " + str2); String str3 = df3.format(todaysDate); System.out.println("String in dd-MMM-yyyy format is: " + str3); String str4 = df4.format(todaysDate); System.out.println("String in MM dd, yyyy format is: " + str4); String str5 = df5.format(todaysDate); System.out.println("String in E, MMM dd yyyy format is: " + str5); String str6 = df6.format(todaysDate); System.out.println("String in E, E, MMM dd yyyy HH:mm:ss format is: " + str6); } catch (Exception ex ){ System.out.println(ex); } } } ``` 輸出: ```java String in dd/MM/yyyy format is: 02/01/2014 String in dd-MM-yyyy HH:mm:ss format is: 02-01-2014 22:38:35 String in dd-MMM-yyyy format is: 02-Jan-2014 String in MM dd, yyyy format is: 01 02, 2014 String in E, MMM dd yyyy format is: Thu, Jan 02 2014 String in E, E, MMM dd yyyy HH:mm:ss format is: Thu, Jan 02 2014 22:38:35 ``` #### 參考: * [`DateFormat`](https://docs.oracle.com/javase/7/docs/api/java/text/DateFormat.html) * [`SimpleDateFormat`](https://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html) * [`Date` - javadoc](https://docs.oracle.com/javase/7/docs/api/java/util/Date.html)
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