java中，自定义类继承Compretor来排序，排序却出了问题，求指点

Question

首先，我的待排序的类TieziAndImageClass中有一字段为String time，是时间来的，其格式为 yyyy-MM-dd HH:mm:ss 。要对这个类的多个实例进行排序，我就是依据这反应时间的字符串来排序的，时间旧的排前，时间新的排后，为此自定义了一个类继承了Compretor

 public class TimeCompreter implements Comparator
{
    public int compare(Object object1,Object object2)
    {
        TieziAndImageClass tiezi1=(TieziAndImageClass)object1;
        TieziAndImageClass tiezi2=(TieziAndImageClass)object2;

        String time1=tiezi1.tiezi.getTime();      //获取反应时间的字符串
        String time2=tiezi2.tiezi.getTime();

        int yearResult=-2;
        String year1=time1.substring(0, 3);
        String year2=time2.substring(0, 3);
        int intYear1=Integer.parseInt(year1);
        int intYear2=Integer.parseInt(year2);
        if(intYear1>intYear2) yearResult=1;
        else if (intYear1==intYear2) yearResult=0;
        else if(intYear1<intYear2) yearResult=-1;
        if(yearResult==1 || yearResult==-1) return yearResult;

        int monthResult=-2;
        String month1=time1.substring(5,6);
        String month2=time2.substring(5,6);
        int intMonth1=Integer.parseInt(month1);
        int intMonth2=Integer.parseInt(month2);
        if(intMonth1>intMonth2) monthResult=1;
        else if (intMonth1==intMonth2) monthResult=0;
        else if(intMonth1<intMonth2) monthResult=-1;
        if(monthResult==1 || monthResult==-1) return monthResult;

        int dayResult=-2;
        String day1=time1.substring(8,9);
        String day2=time2.substring(8,9);
        int intDay1=Integer.parseInt(day1);
        int intDay2=Integer.parseInt(day2);
        if(intDay1>intDay2) dayResult=1;
        else if (intDay1==intDay2) dayResult=0;
        else if(intDay1<intDay2) dayResult=-1;
        if(dayResult==1 || dayResult==-1) return dayResult;

        int hourResult=-2;
        String hour1=time1.substring(11,12);
        String hour2=time2.substring(11,12);
        int intHour1=Integer.parseInt(hour1);
        int intHour2=Integer.parseInt(hour2);
        if(intHour1>intHour2) hourResult=1;
        else if (intHour1==intHour2) hourResult=0;
        else if(intHour1<intHour2) hourResult=-1;
        if(hourResult==1 || hourResult==-1) return hourResult;

        int minuteResult=-2;
        String minute1=time1.substring(14,15);
        String minute2=time2.substring(14,15);
        int intMinute1=Integer.parseInt(minute1);
        int intMinute2=Integer.parseInt(minute2);
        if(intMinute1>intMinute2) minuteResult=1;
        else if (intMinute1==intMinute2) minuteResult=0;
        else if(intMinute1<intMinute2) minuteResult=-1;
        if(minuteResult==1 || minuteResult==-1) return minuteResult;

        int secondResult=-2;
        String second1=time1.substring(17,18);
        String second2=time2.substring(17,18);
        int intSecond1=Integer.parseInt(second1);
        int intSecond2=Integer.parseInt(second2);
        if(intSecond1>intSecond2) secondResult=1;
        else if (intSecond1==intSecond2) secondResult=0;
        else if(intSecond1<intSecond2) secondResult=-1;
        return secondResult;
    }
}

按如下方式来使用

     Collectios.sort(list对象，new TimeCompretor());

但是最后排序结果很乱，没能按预期的旧的排前，新的排后这样来排，实际中的是旧的有点排前也有点排到后面去了，总之排完之后的顺序混乱，求指点一下

Answer 1

你这种比较是有问题的，通过下面的这种方式。转换成时间对象比较：

public class TimeCompreter implements Comparator<TimerObject>{

    @Override
    public int compare(TimerObject o1, TimerObject o2) {

        String time1 = o1.getTimer();
        String time2 = o2.getTimer();

        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date date1 = null;
        Date date2 = null;
        try {
            date1 = format.parse(time1);
            date2 = format.parse(time2);
        } catch (ParseException e) {
            e.printStackTrace();
        }

        return date1.compareTo(date2);
    }

}