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1.可以帮你实现设计模式模型
2.可以帮你优化代码，比如下面这段代码获取时间集合的方法
public List<Date> getDealTimeList(Integer showType){ List<Date> timeList = new
ArrayList<>(); Calendar cal = new GregorianCalendar();
cal.set(Calendar.HOUR_OF_DAY, 0); cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0); cal.set(Calendar.MILLISECOND, 0); //取当天 00:00:00
Date date = cal.getTime(); int count = 0; int minute = 0; if (showType ==
RateShowTimeTypeEnum.MINUTE.getType()){ //0点开始15分钟一个点 minute = 15; //循环取前1天时间
24小时乘60分除15等于循环次数 count = 24 * 60 / 15; }else if (showType ==
RateShowTimeTypeEnum.HOURS.getType()){ //1天 1小时一个点 minute= 60; //1天24小时循环24次
count = 24; } for (int i = 0; i< count; i++){ Calendar calendar =
Calendar.getInstance(); calendar.setTime(date); calendar.add(Calendar.MINUTE, +
minute); Date beforeDate = calendar.getTime(); //大于当前时间则退出 if
(beforeDate.compareTo(new Date()) > 0){ break; } timeList.add(beforeDate); }
return timeList; }
好家伙，不单是给分析优化方向，连优化后的代码都给写出来了（注释都给加好了）这不CV直接用了？
public List<Date> getDealTimeListTwo(Integer showType){ List<Date> timeList =
new ArrayList<>(); ZonedDateTime now = ZonedDateTime.now(); ZonedDateTime start
= now.with(ChronoField.MINUTE_OF_DAY, 0) .with(ChronoField.SECOND_OF_MINUTE, 0)
.with(ChronoField.MILLI_OF_SECOND, 0); Duration duration; if (showType ==
RateShowTimeTypeEnum.MINUTE.getType()) { duration = Duration.ofMinutes(15); }
else if (showType == RateShowTimeTypeEnum.HOURS.getType()) { duration =
Duration.ofHours(1); } else { // 如果不满足上述条件，则返回空列表。 return timeList; } //
添加一天内所有的时间点到列表中。 for (ZonedDateTime time = start; time.isBefore(now); time =
time.plus(duration)) { Date date = Date.from(time.toInstant());
timeList.add(date); } return timeList; }