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用不同格式顯示日曆年日期的 Java 程式
在本文中，我們將瞭解如何以不同格式顯示日曆年的日期。Java 沒有內建的日期類，但我們可以匯入 java.time 包來使用日期和時間 API。該包包括許多日期和時間類。
以下是相同的演示 −
假設我們的輸入是 −
Run the program
預期輸出為 −
The first date format is:2022-03-17T23:37:37.623304800 The second date format is:17/03/2022 The third date format is:Thursday, 17 Mar 2022
演算法
Step 1 - START Step 2 - Declare an object of LocalDateTime namely date. Step 3 - Define the values. Step 4 - Define different date time formats using DateTimeFormatter objects Step 5 - Display the different date time formats Step 6 - Stop
示例 1
在這裡，我們在“main”函式下將所有操作捆綁在一起。
import java.time.*;
import java.time.format.DateTimeFormatter;
public class Demo {
public static void main(String[] args){
System.out.println("The required packages have been imported");
LocalDateTime date = LocalDateTime.now();
System.out.println("A LocalDateTime object has been defined");
System.out.println("\nThe first date format is:" +date);
DateTimeFormatter date_format_1 = DateTimeFormatter.ofPattern("dd/MM/yyyy");
String formattedDate_1 = date.format(date_format_1);
System.out.println("\nThe second date format is:" +formattedDate_1);
DateTimeFormatter date_format_2 = DateTimeFormatter.ofPattern("EEEE, dd MMM yyyy");
String formattedDate_2 = date.format(date_format_2);
System.out.println("\nThe third date format is:" +formattedDate_2);
}
}輸出
The required packages have been imported A LocalDateTime object has been defined The first date format is:2022-03-17T23:37:37.623304800 The second date format is:17/03/2022 The third date format is:Thursday, 17 Mar 2022
示例 2
在這裡，我們將操作封裝到函式中，展示面向物件的程式設計。
import java.time.*;
import java.time.format.DateTimeFormatter;
public class Demo {
static void print_date_format(LocalDateTime date){
DateTimeFormatter date_format_1 = DateTimeFormatter.ofPattern("dd/MM/yyyy");
String formattedDate_1 = date.format(date_format_1);
System.out.println("\nThe second date format is:" +formattedDate_1);
DateTimeFormatter date_format_2 = DateTimeFormatter.ofPattern("EEEE, dd MMM yyyy");
String formattedDate_2 = date.format(date_format_2);
System.out.println("\nThe third date format is:" +formattedDate_2);
}
public static void main(String[] args){
System.out.println("The required packages have been imported");
LocalDateTime date = LocalDateTime.now();
System.out.println("A LocalDateTime object has been defined");
System.out.println("\nThe first date format is:" +date);
print_date_format(date);
}
}輸出
The required packages have been imported A LocalDateTime object has been defined The first date format is:2022-03-17T23:37:37.623304800 The second date format is:17/03/2022 The third date format is:Thursday, 17 Mar 2022
更新日期：2022 年 3 月 30 日
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