Java 程序以不同格式显示日历年的日期
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在本文中，我们将了解如何以不同格式显示日历年的日期。Java 没有内置的 Date 类，但我们可以导入 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
算法
步骤 1 - 开始 步骤 2 - 声明 LocalDateTime 的对象，即日期。 步骤 3 - 定义值。 步骤 4 - 使用 DateTimeFormatter 对象定义不同的日期时间格式 步骤 5 - 显示不同的日期时间格式 步骤 6 - 停止
示例 1
在这里，我们将所有操作绑定在 ‘main’ 函数下。
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，我们将操作封装成展现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
