CODEWITHSUNDEEP
javadictionary
Jitendra Khedar
Jitendra Khedar

Reputation: 129

how to filter following map?

I have got these values in my HashMap ,

"ver":"a"
"ver":"b"
"ver":"c"
"os":"d"
"os":"e"

i need only:

"os":"d"
"os":"e"

My code is: 

String[] eachPair = myString.split(",");
Map<String,String> pairs = new HashMap<String,String>();

for(String pair: eachPair) {
    pairs.put(pair.substring(0, pair.indexOf(":")).trim(), pair.substring(pair.indexOf(":")+1));
}
pairs.get("os");

but its not working. please help

Upvotes: 0

Views: 64

Answers (3)

Prabhaker A
Prabhaker A

Reputation: 8473

HahMap doesn't allows duplicate keys.So I recommand to use Guava's MultiMap or apache's MultiValueMap
Please look into
the sample code reference of MultiMap: http://tomjefferys.blogspot.in/2011/09/multimaps-google-guava.html
the sample code reference of MultiValueMap: http://java.dzone.com/articles/allowing-duplicate-keys-java

Upvotes: 1

Siva
Siva

Reputation: 1940

Map should have unique keys only, If you add a value with the same key which is already exist in the map, value for that key will be override and you will lost the old value.

Upvotes: 1

Prabhakaran Ramaswamy
Prabhakaran Ramaswamy

Reputation: 26094

An object that maps keys to values. A map cannot contain duplicate keys; each key can map to at most one value.

Upvotes: 1

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