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Help with Data Structures...

 
Sneha Kashyap
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Hi,

I am unable to decide as to which data structure to use for the following purpose
Slno Name
01 abc
01 def
02 abc
03 xyz

I want these to be grouped and then stored accordingly Like: 01 {abc,def}
02 {abc}
03 {xyz}
I want to group these as itemsets based on the sl no value.

Please Help Thanks in advance.
 
mahesh shinde
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you mean which collection class
 
Sneha Kashyap
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Thanks, Yeah and how to use it to achieve the same.
 
Ulf Dittmer
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How about Map<Integer, List<String>>?

Or maybe Map<String, List<String>> if the "01" is a string and not an integer.
 
Sneha Kashyap
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Thanks, but map cannot contain duplicate values, I need to have duplicate keys, like 01 mapping to abc,def Can you help me as to how this can be achieved.
 
saipraneeth nallapareddy
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i guess it is TreeSet which will eliminate the duplicate not the HashMap.
name-value pairs are sufficient.
don't confuse with HashSet and HashMap.
 
Ulf Dittmer
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Thanks, but map cannot contain duplicate values, I need to have duplicate keys, like 01 mapping to abc,def

That's not duplicate keys in the Map, that's multiple entries in the List.
 
Campbell Ritchie
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Sneha Kashyap wrote: Thanks, but map cannot contain duplicate values, I need to have duplicate keys, like 01 mapping to abc,def Can you help me as to how this can be achieved.
Ulf has already told you what to do.
 
Don't get me started about those stupid light bulbs.
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