将负作业YearToSecond对象转换为毫秒的正确方法

import java.time.LocalDateTime;
import java.time.temporal.ChronoUnit;

public class YearToSecondConverter {
    public static void main(String[] args) {
        YearToSecond yearToSecond = new YearToSecond(-1, -2, -3, -4, -5, -6);
        long milliseconds = convertYearToSecondToMilliseconds(yearToSecond);
        System.out.println(milliseconds);
    }
    
    public static long convertYearToSecondToMilliseconds(YearToSecond yearToSecond) {
        // 获取当前时间
        LocalDateTime now = LocalDateTime.now();
        
        // 将YearToSecond对象转换为毫秒
        LocalDateTime result = now.plusYears(yearToSecond.getYears())
                                .plusMonths(yearToSecond.getMonths())
                                .plusDays(yearToSecond.getDays())
                                .plusHours(yearToSecond.getHours())
                                .plusMinutes(yearToSecond.getMinutes())
                                .plusSeconds(yearToSecond.getSeconds());
        
        // 计算与当前时间的时间间隔，得到毫秒数
        long milliseconds = ChronoUnit.MILLIS.between(now, result);
        
        return milliseconds;
    }
}

class YearToSecond {
    private int years;
    private int months;
    private int days;
    private int hours;
    private int minutes;
    private int seconds;
    
    public YearToSecond(int years, int months, int days, int hours, int minutes, int seconds) {
        this.years = years;
        this.months = months;
        this.days = days;
        this.hours = hours;
        this.minutes = minutes;
        this.seconds = seconds;
    }
    
    // 省略getter和setter方法
}