Java程序显示当前日期和时间

在本文中，我们将了解如何显示当前日期和时间。 Java没有内置的Date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。

下面是相同的演示 -

假设我们的输入是 -

Run the program

期望的输出是 -

The current date and time is: 2022/03/17 23:43:17

算法

Step 1 - START
Step 2 - Declare an object of LocalDateTime namely date.
Step 3 - Define the values.
Step 4 - Define a date time format using DateTimeFormatter objects
Step 5 - Display the date and time using a specific formats
Step 6 - Stop

示例 1

这里，我们将所有操作绑定到“main”函数下。

import java.time.format.DateTimeFormatter;
import java.time.LocalDateTime;
public class Demo {
   public static void main(String[] args) {
      System.out.println("The required packages have been imported");
      System.out.println("A LocalDateTime object has been defined");
      DateTimeFormatter date_time = DateTimeFormatter.ofPattern("yyyy/MM/dd HH:mm:ss");
      LocalDateTime now = LocalDateTime.now();
      System.out.println("\nThe current date and time is: " +date_time.format(now));
   }
}

输出

The required packages have been imported
A LocalDateTime object has been defined

The current date and time is: 2022/03/17 23:43:17

示例 2

在这里，我们将操作封装到展示面向对象编程的函数中。

import java.time.format.DateTimeFormatter;
import java.time.LocalDateTime;
public class Demo {
   static void Date_time(DateTimeFormatter date_time){
      LocalDateTime now = LocalDateTime.now();
      System.out.println("\nThe current date and time is: " +date_time.format(now));
   }
   public static void main(String[] args) {
      System.out.println("The required packages have been imported");
      System.out.println("A LocalDateTime object has been defined");
      DateTimeFormatter date_time = DateTimeFormatter.ofPattern("yyyy/MM/dd HH:mm:ss");
      Date_time(date_time);
   }
}

输出

The required packages have been imported
A LocalDateTime object has been defined

The current date and time is: 2022/03/29 08:55:28

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