CODEWITHSUNDEEP
javaspring
Cedrix Cedrix
Cedrix Cedrix

Reputation: 113

How to add and merge values of the same map in java

Hi I am having trouble in adding the integer value of my map and merging the string value of it what I want to do is for example I have the following code:

List<Object[]> results = customerRepository.findByAddress();

for(Object[] object : results) {
    Map<Object, Object> location = new LinkedHashMap<>();
    location.put("Region", object[0]);
    location.put("Tally", object[1]);
    for(String obj : regionOne) {
        if(object[0].equals(obj)) {
            location.replace("Region", "Region I");
        }
    }
}

and this is the following data:

Region: Pasig
Tally: 2
Region: Taguig
Tally: 2

what I want is to add the value of Tally so 2 + 2 = 4 and merge and replace Pasig and Taguig to Region I

so the results should be

 Region: Region I
 Tally: 4

I have looked at the merge function and it seems that it is not what I'm looking for or I just didn't quite get it Thanks in advance.

Upvotes: 0

Views: 65

Answers (1)

Preston
Preston

Reputation: 418

If you are using Java 8 or bigger, Map::computeIfPresent could be useful for your question.

And by the way, I think it is better to separate the business part from your code when asking questions.

Upvotes: 1

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