Java 8中如何格式化LocalDateTime呢?

格式化LocalDateTime方法

实现思路:
    使用DateTimeFormatter即可格式化LocalDateTime对象

package com.java265.time;
 
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
 
public class TestClass {
    public static void main(String[] args) {
        //获取当前时间
        LocalDateTime now = LocalDateTime.now();
        System.out.println("Before : " + now);
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        String formatDateTime = now.format(formatter);
        System.out.println("After : " + formatDateTime);
    }
}


//字符串转换为LocalDateTime

package com.java265.time;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
public class TestDate2 {
    public static void main(String[] args) {
        String now = "2023-02-02 17:15";
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");
        LocalDateTime formatDateTime = LocalDateTime.parse(now, formatter);
        System.out.println("Before : " + now);
        System.out.println("After : " + formatDateTime);
        System.out.println("After : " + formatDateTime.format(formatter));
    }
}