Regarding compile time error in Map

Question

Please don't consider this question as duplicate although I have a similiar question earlier but this time it is different..

Map m = new LinkedHashMap();
m.put ("123", "23"); 
m.put ("323", "23");
m.put ("153", "23");
m.put ("623", "23");
m.put ("125", "23");
m.put ("122", "24");
m.put ("167", "24");
m.put ("173", "24");
m.put ("113", "25");

Now my query is is that I need to find out the that how many scripts are there associated with patient Id 23 as seen above 5 total different scripts are there,

I have done this..

List<String> keys = new ArrayList<String>();
        for(String str: m.keySet())
        {
            if(m.get(str).equals("23")) {
                keys.add(str);
            }
        }

but it shows complier error cannot convert object to string please advise.

score 3 · Answer 1 · answered Jan 09 '13 at 18:07

3

Change

Map m = new LinkedHashMap();

to

Map <String,String>m = new LinkedHashMap<String,String>();

So it knows that it's a map of strings pointing to strings.

answered Jan 09 '13 at 18:07

dashrb

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score 1 · Answer 2 · answered Jan 09 '13 at 18:07

1

"cannot convert object to string please advise" <-- this is normal since your Map declaration does not allow for this.

You should declare:

Map<String, String> m = new LinkedHashMap<String, String>();

answered Jan 09 '13 at 18:07

fge

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Adrián · Answer 3 · 2013-01-09T18:25:51.747

0

You haven't defined your Map as a Map of Strings. Therefore, the keyset you're iterating over is a set of Objects. Try changing your Map declaration to:

Map<String, String> m = new LinkedHashMap<String, String>();

edited Jan 09 '13 at 18:25

answered Jan 09 '13 at 18:09

Adrián

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Regarding compile time error in Map

3 Answers3