Get a list of key's in HashMap having key like 'some value'

Question

In Mysql we can query a table having clause " WHERE name LIKE '%someName%' ", can we have the same functionality with HashMap in java,if so how can we achieve this more efficiently in a less time by not iterating over each element?

Answer 1

If you're using Java SE 8 and the new Streams API: there is a filter method which basically is what you are looking for, I think.

e.g. something like (untested!):

myMap.entrySet().stream().filter(entry -> entry.getKey().contains("someName")).map(entry -> entry.getValue()).collect(Collectors.toList());