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I have a list of the string contains duplicate values and I want to retain the duplicate value also in the Map and my code is below my list contains only 2 values while iterating in for loop I want all four values in Map with key and values and my code is below .please help. Thanks in advance

      List<object> arr = new List<object>({COMPANYID=388, 
        CONTACTID=6362,ROLE_NAME=Architect},
        {COMPANYID=388, CONTACTID=6663,ROLE_NAME=Developer},
        {COMPANYID=399, CONTACTID=10358, ROLE_NAME=Engineer},
        {COMPANYID=399, CONTACTID=10357, ROLE_NAME=Engineer});
      Map<String,object> mp_StrObj = new Map<String,object>();
      Map<string,object> FinalMap = new Map<string ,object>();
       

                for(object obj :arr)
                {
                    System.debug('Role: '+obj);
                    mp_StrObj = (Map<string,object>)obj;
                    FinalMap.put(string.valueof(mp_StrObj.get('COMPANYID')),mp_StrObj);
                   
                    
                }

        System.debug('FinalMap '+FinalMap);

when I print the final map it shows only 2 objects.but I want all the four in FinalMap Map

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A map always has unique key values. Where you have multiple objects that could share the same key, you must make the map's values allow for this. For example, here I would make your Map<string,object> FinalMap actually Map<string,List<Object>> finalMap. Now you would populate it thus:

for  (Object obj : arr) {
    List<Object> entries = finalMap.get(obj.COMPANY_ID);

    if (entries == null) {
        finalMap.put(obj.COMPANY_ID, New List<Object>{ obj });
    } else {
        entries.add(obj);
    }
}

At this point all arr objects sharing the same company ID can be fetched from the map using the company ID value.

Note that I have ignored some typing issues since your question does not clarify the type of object you hold here.

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