java立面可以在hashmap里加入一个（add）hashmap么，具体方法是这么样加入？

不知道 你具体需求是什么 HashMap有put方法。假设你要加入的key-value对是<Object, HashMap>,可以这么写:

HashMap<Object, HashMap>map1 = new HashMap()

Object obj = new Object()

HashMap<Object, Object>map2 = new HashMap()

map1.put(obj, map2)

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   

view plaincopy to clipboardprint?    import java util Map

//inquiry result    List fromDetailList = instHdDao retrieveInstInfoByView(sysOwnerCd fromCd instruct)

// Initial Value    Integer dtTotalTruck =     Integer dtTotalQuantity =

Map hm = new HashMap()

Iterator it = erator()    while(it hasNext()){        MeInstHd meInstHd = (MeInstHd)it next()

List arr = new ArrayList()        List arr = new ArrayList()        List arr = new ArrayList()

String carrierCd = meInstHd getCarrCd() trim()

arr add(carrierCd)// put keyValue to Arr

if(ntainsKey(arr )){            // carrierCd is exist in hm            arr = (ArrayList)hm get(arr )// 通过Key arr 取得arr 的Value arr List arr 中有2列值 他们分别是dtTotalQuantity 和dtTotalTruck

dtTotalQuantity = (Integer)arr get( )             dtTotalQuantity += meInstHd sumInstructQty()            dtTotalTruck = (Integer)arr get( )             dtTotalTruck +=

arr add(dtTotalQuantity)            arr add(dtTotalTruck)

hm put(arr arr )// creat hashMap hm         }        else{            // carrierCd is not exist in hm            arr add(meInstHd sumInstructQty())//put value to arr             arr add( )// dtTotalTruck initial value is

lishixinzhi/Article/program/Java/hx/201311/27090

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