LocalDate類format()方法 (LocalDate Class format() method)

• format() method is available in java.time package.

  format()方法在java.time包中可用。

• format() method is used to format this LocalDate object by using the given DateTimeFormatter object.

  format()方法用于通過使用給定的DateTimeFormatter對象來格式化此LocalDate對象。

• format() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  format()方法是一個非靜態方法，只能通過類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

• format() method may throw an exception at the time of formatting this object.

  在格式化此對象時， format()方法可能會引發異常。

  DateTimeException: This exception may throw when getting any error during formatting.

  DateTimeException ：格式化期間發生任何錯誤時，可能會引發此異常。

Syntax:

句法：

    public String format(DateTimeFormatter dt_formatter);

Parameter(s):

參數：

• DateTimeFormatter dt_formatter – represents the formatter to format this object.

  DateTimeFormatter dt_formatter –表示用于格式化此對象的格式化程序。

Return value:

返回值：

The return type of this method is String, it returns date formatted by the given formatter of this LocalDate object.

此方法的返回類型為String ，它返回由此LocalDate對象的給定格式化程序格式化的日期。

Example:

例：

// Java program to demonstrate the example 
// of format(DateTimeFormatter dt_formatter)
// method of LocalDate
import java.time.*;
import java.time.format.*;
public class FormatOfLocalDate {
public static void main(String args[]) {
// Instantiates two LocalDate
LocalDate l_da1 = LocalDate.parse("2007-04-04");
LocalDate l_da2 = LocalDate.now();
// Display l_da1,l_da2
System.out.println("LocalDate l_da1 and l_da2: ");
System.out.println("l_da1: " + l_da1);
System.out.println("l_da2: " + l_da2);
System.out.println();
// Here, this method formats this date 
// by using the pattern "dd-MMM-yyyy"
DateTimeFormatter dtf = DateTimeFormatter.ofPattern("dd-MMM-yyyy");
String format = l_da1.format(dtf);
// Display format
System.out.println("l_da1.format(dtf): " + format);
// Here, this method formats this date by
// using the pattern "dd/MM/yyyy"
dtf = DateTimeFormatter.ofPattern("dd/MM/yyyy");
format = l_da2.format(dtf);
// Display format
System.out.println("l_da2.format(dtf): " + format);
}
}

Output

輸出量

LocalDate l_da1 and l_da2: 
l_da1: 2007-04-04
l_da2: 2020-05-29l_da1.format(dtf): 04-Apr-2007
l_da2.format(dtf): 29/05/2020

翻譯自: https://www.includehelp.com/java/localdate-format-method-with-example.aspx