1.HashMap相关问题

1.1HashMap存key，value，key会有重复的，value会有多个值，选取此方式进行存取，动态获取key，value取list，若满足条件，list一直add，key覆盖掉之前的，list一直在增加。HashMap> preDetailMap=new HashMap>();

for (int i=0;i

ScatteredPrescriptionDetail scatteredPrescriptionDetail = prescriptionDetailList.get(i);

if("Y".equals(scatteredPrescriptionDetail.getIsSubOrder())){

if (!preDetailMap.containsKey(scatteredPrescriptionDetail.getParentOrderSN())) {

List tmpList=new ArrayList();

tmpList.add(scatteredPrescriptionDetail);

preDetailMap.put(scatteredPrescriptionDetail.getParentOrderSN(), tmpList);

}

else {

System.out.println();

preDetailMap.get(scatteredPrescriptionDetail.getParentOrderSN()).add(scatteredPrescriptionDetail);

}

}

else if("N".equals(scatteredPrescriptionDetail.getIsSubOrder())){

faList.add(scatteredPrescriptionDetail);

}

}

1.2关于计算日期上一周与下一周的问题public String changeCurrentTime()throws Exception{

String before = getParameter("before");

String flag = getParameter("flag");

String[] split=before.split("-");

int year=Integer.valueOf(split[0]).intValue();

int mon=Integer.valueOf(split[1]).intValue();

int day=Integer.valueOf(split[2]).intValue();

String after="";

if("B".equals(flag)) {

int tmpday=0;

if(day<=7) {

tmpday=7-day;

mon=mon-1;

day=new Date(year, mon, 0).getDate()-tmpday;

if(mon<=0) {

year=year-1;

mon=12;

day=new Date(year, mon, 0).getDate();

}

}else {

day=day-7;

}

after=String.valueOf(year)+"-";

after=after+String.valueOf((mon<10?String.valueOf("0"+mon):String.valueOf(mon)))+"-";

after=after+String.valueOf(day<10?String.valueOf("0"+day):String.valueOf(day));

}

if("A".equals(flag)) {

int tmpday=0;

day=day+7;

if(day>new Date(year, mon, 0).getDate()) {

tmpday=new Date(year, mon, 0).getDate();

mon=mon+1;

day=day-tmpday;

if(mon>12) {

year=year+1;

mon=1;

}

}

after=String.valueOf(year)+"-";

after=after+String.valueOf((mon<10?String.valueOf("0"+mon):String.valueOf(mon)))+"-";

after=after+String.valueOf(day<10?String.valueOf("0"+day):String.valueOf(day));

}

return after;

}