java中的時間運算

1、關於java中的時間運算

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
/**
 * 時間運算
 */
public class TestDate {
    public static void main(String[] args) {
        //時間運算 對當前時間加兩天
        LocalDate futureDay = LocalDate.now().plusDays(2);
        System.out.println(futureDay); 
        //列印 2020-10-28
        LocalDateTime futureDayTime = LocalDateTime.now().plusDays(2);
        System.out.println(futureDayTime);
        //列印 2020-10-28T23:45:12.299

        //日期格式 自定義
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        System.out.println(futureDayTime.format(formatter));
        //列印 2020-10-28 23:45:12
    }
}