没看懂题？没有理解？要我做什么？(语言-java)

Question

创建时间（Time）类，它包含的三个字段hour、minute、
second，含一个timePeriod方法，用于计算零点时刻到当前时间的时
间间隔（秒）
（2）创建两个对象，并按6个数位hh:mm:ss（2个表示小时，2个表
示分钟、2个表示秒）输出相关信息，如：03:24:33或14:05:45。
计算并显示对象与零点时刻的时间间隔
提示：采用格式输出
System.out.printf(%2d”,5）//输出占2位
System.out.printf(%02d”5）//输出占2位，不足2位用0补

Answer 1

import javax.xml.crypto.dsig.spec.XSLTTransformParameterSpec;

public class test {
    public static void main(String[] args) {
        Time time1=new Time();
        Time time2=new Time(555550000);
        Time time3=new Time(3,80,3700);
        System.out.println(time1.toString());
        System.out.println(time2.toString());
        System.out.println(time3.toString());
    }
}
class Time{
    private long hour,minute,second;
    public Time(){
        setTime(System.currentTimeMillis());
    }
    public Time(long elapsedTime){
        setTime(elapsedTime);
    }
    public Time(long hour,long minute,long second){
        this.second=second%60;
        this.minute=(second/60+minute)%60;
        this.hour=(second/60+minute/60+hour)%60;
    }
    public void setTime(long elapsedTime){
        long totalSeconds = elapsedTime / 1000;
        second = (long)(totalSeconds % 60);
        long totalMinutes = totalSeconds / 60;
        minute = (long)(totalMinutes % 60);
        long totalHours = (int)(totalMinutes / 60);
        hour = (long)(totalHours % 24);
    }
    public void setTime(int hour,int minute,int second){
        this.hour=hour;
        this.minute=minute;
        this.second=second;
    }

    @Override
    public String toString() {
        return "Hour: " + this.hour + " Minute: " +  this.minute + " Second: " + this.second;
    }

}