CODEWITHSUNDEEP
javahashmap
vipul marlecha
vipul marlecha

Reputation: 15

replace duplicate values string in hashmap java

I have a hashmap which contains student id as key and some string as value. It contains data like

a abc.txt
b cde.txt
d abc.txt

I want to find the duplicate values in map and replace them with genreic values. I want a map like

a abc.txt
b cde.txt
d abc_replacevalue.txt

I have tried with the code but its not working

Map<String,String> filemap = new HashMap<String,String>();
// filemap is the original hash map..

Set<String> seenValues = new HashSet<String>();
Map<String, String> result = new HashMap<String, String>();

for (Map.Entry<String, String> entry : filemap.entrySet()) {
    String value = entry.getValue();

    if (seenValues.contains(value)) {
        value = "updated"; // update value here
    }
    result.put(entry.getKey(), value);
    seenValues.add(value);
}

for (String key : result.keySet() ) {
    String value = result.get( key );
    System.out.println(key + " = " + value);
}

The output is still the same

a abc.txt
b cde.txt
d abc.txt

Upvotes: 0

Views: 189

Answers (1)

Matthew Franglen
Matthew Franglen

Reputation: 4532

You can generate a new map from an existing one, checking every new value that you come across to see if it has already been seen:

Set<String> seenValues = new HashSet<String>();
Map<String, String> result = new HashMap<String, String>();

for (Map.Entry<String, String> entry : original.entrySet()) {
    String value = entry.getValue();

    if (seenValues.contains(value)) {
        value = ...; // update value here
    }
    result.put(entry.getKey(), value);
    seenValues.add(value);
}

Upvotes: 2

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