Java 以不同格式显示日历年份的日期

在本文中，我们将了解如何以不同格式显示日历年份的日期。Java没有内建的日期类，但是我们可以导入java.time包来使用日期和时间API。该包包含许多日期和时间类。

以下是相同演示的示例：

假设我们的输入是 –

Run the program

期望的输出结果将是 −

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

步骤

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

在这里，我们将所有操作都绑定在“main”函数之下。

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);
   }
}

输出

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

在这里，我们将操作封装为展示面向对象编程的函数。

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);
   }
}

输出

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