Collections key comparison in case-insensitive

[Parameswaran Thangavel]

hi all
I am using HashMap for storing some key value pairs.
Then i will retrieve the value from the HashMap by passing the key.

Later i found that the Key comparison done is case-sensitive , but i need the comparison to be case-insensitive.

Is there any other collections with case-insensitive comparison for the key object.

Thanks

[Naseem Khan]

Originally posted by Parameswaran Thangavel:
hi all
I am using HashMap for storing some key value pairs.
Then i will retrieve the value from the HashMap by passing the key.

Later i found that the Key comparison done is case-sensitive , but i need the comparison to be case-insensitive.

Is there any other collections with case-insensitive comparison for the key object.

Thanks

Is this key entered by some user? or you are just iterating over the collection of Map.Entry and getting each and every value.

[Parameswaran Thangavel]

Key is entered by the user. so there is possibiliyt the user can enter in different cases.

[Naseem Khan]

Map map= new HashMap(); 
 
String key = "Parameswaran";
map.put(key.toLowerCase(), "Thangavel");
 
String userEnteredKey = "PARAMESWARAN"
if(map.containsKey(userEnteredKey.toLowerCase())){
  System.out.println(map.get(userEnteredKey.toLowerCase()));
}

Above approach is useful only if you don't have more than one key stored in Map with the same name but with different case like "Parameswaran" and "PArameswaran".

Naseem

[Ilja Preuss]

Don't use the String as the key, but some wrapper around the String that implements equals and hashCode in a case-insensitive way.