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I want to add two Map into the third map using lambda expression in java. following is my code. can anyone let me know how to do it.

I want above two maps into third map like Mapurls=repo+data

Please suggest me solution.

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    What happens when you have a duplicate key? Commented Jan 27, 2017 at 13:39
  • you could iterate over the two maps : repo.forEach((key, value) -> mapurls.put(key, value)); and data.forEach((key, value) -> mapurls.put(key, value)); if you have the same key in repo and data, the value of data will be stored Commented Jan 27, 2017 at 13:43
  • Take a look here: stackoverflow.com/questions/23038673/… Commented Jan 27, 2017 at 13:45
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    @oliv37 What is the advantage of that over mapurls#putAll? Commented Jan 27, 2017 at 13:45
  • @bradimus nothing, he wanted to use lambda expression. BTW you can write repo.forEach(mapurls::put); Commented Jan 27, 2017 at 13:48

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Iterating through the key, values for each and adding them to finalMap should work - 

Map<String, String> repo = TestRailReader.appendPathToUrl(urlRepo, CoreKeywords.REPO.name());
Map<String, String> data = TestRailReader.appendPathToUrl(urlData, CoreKeywords.DATA.name());
Map<String, String> mergedMap = new HashMap<>();
repo.forEach(mergedMap::put);
data.forEach(mergedMap::put);

Though the solution as suggested by @Emax in comments works better for the case when you need to merge. - Merging two Map<String, Integer> with Java 8 Stream API

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1 Comment

You are better off calling Map.putAll and letting the Map decide how it wants to loop.

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