JAVA中HashMap（哈希表）的使用(List)方法

当hashMap的key是多个字段且想得到多个value时可能将key和 value分别做成List

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import javautilMap;

//inquiry result

List fromDetailList = instHdDaoretrieveInstInfoByView(sysOwnerCd fromCd instruct);

// Initial Value

Integer dtTotalTruck = ;

Integer dtTotalQuantity = ;

Map hm = new HashMap();

Iterator it = erator();

while(ithasNext()){

MeInstHd meInstHd = (MeInstHd)itnext();

List arr = new ArrayList();

List arr = new ArrayList();

List arr = new ArrayList();

String carrierCd = meInstHdgetCarrCd()trim();

arradd(carrierCd); // put keyValue to Arr

if(ntainsKey(arr)){

// carrierCd is exist in hm

arr = (ArrayList)hmget(arr); // 通过Key arr取得arr的Value arrList arr中有２列值他们分别是dtTotalQuantity 和dtTotalTruck

dtTotalQuantity = (Integer)arrget() ;

dtTotalQuantity += meInstHdsumInstructQty();

dtTotalTruck = (Integer)arrget() ;

dtTotalTruck += ;

arradd(dtTotalQuantity);

arradd(dtTotalTruck);

hmput(arr arr); // creat hashMap hm

}

else{

// carrierCd is not exist in hm

arradd(meInstHdsumInstructQty()); //put value to arr

arradd(); // dtTotalTruck initial value is

hmput(arrarr); // 其中arr是keyarr是value可以通过get(arr)来取得其value

}

}