幾秒前，幾分鐘前，幾小時前，幾天前，幾月前，幾年前的java實現

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package com.zuidaima;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Date;public class RelativeDateFormat {    private static final long ONE_MINUTE = 60000L;    private static final long ONE_HOUR = 3600000L;    private static final long ONE_DAY = 86400000L;    private static final long ONE_WEEK = 604800000L;    private static final String ONE_SECOND_AGO = "秒前";    private static final String ONE_MINUTE_AGO = "分鐘前";    private static final String ONE_HOUR_AGO = "小時前";    private static final String ONE_DAY_AGO = "天前";    private static final String ONE_MONTH_AGO = "月前";    private static final String ONE_YEAR_AGO = "年前";    public static void main(String[] args) throws ParseException {        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:m:s");        Date date = format.parse("2013-11-11 18:35:35");        System.out.println(format(date));    }    public static String format(Date date) {        long delta = new Date().getTime() - date.getTime();        if (delta < 1L * ONE_MINUTE) {            long seconds = toSeconds(delta);            return (seconds <= 0 ? 1 : seconds) + ONE_SECOND_AGO;        }        if (delta < 45L * ONE_MINUTE) {            long minutes = toMinutes(delta);            return (minutes <= 0 ? 1 : minutes) + ONE_MINUTE_AGO;        }        if (delta < 24L * ONE_HOUR) {            long hours = toHours(delta);            return (hours <= 0 ? 1 : hours) + ONE_HOUR_AGO;        }        if (delta < 48L * ONE_HOUR) {            return "昨天";        }        if (delta < 30L * ONE_DAY) {            long days = toDays(delta);            return (days <= 0 ? 1 : days) + ONE_DAY_AGO;        }        if (delta < 12L * 4L * ONE_WEEK) {            long months = toMonths(delta);            return (months <= 0 ? 1 : months) + ONE_MONTH_AGO;        } else {            long years = toYears(delta);            return (years <= 0 ? 1 : years) + ONE_YEAR_AGO;        }    }    private static long toSeconds(long date) {        return date / 1000L;    }    private static long toMinutes(long date) {        return toSeconds(date) / 60L;    }    private static long toHours(long date) {        return toMinutes(date) / 60L;    }    private static long toDays(long date) {        return toHours(date) / 24L;    }    private static long toMonths(long date) {        return toDays(date) / 30L;    }    private static long toYears(long date) {        return toMonths(date) / 365L;    }}

幾秒前，幾分鐘前，幾小時前，幾天前，幾月前，幾年前的java實現