Map<String, List<String>> parameters;
Map<String, String[]> collect = parameters.entrySet().stream()
.collect(Collectors.toMap(entry-> entry.getKey(),entry -> entry.getValue().toArray()));
I'm getting compiler error cannot resolve method 'getKey()'
You should create an array of the correct type (i.e. a String[] and not an Object[]):
Map<String, String[]> collect =
parameters.entrySet()
.stream()
.collect(Collectors.toMap(Map.Entry::getKey,
entry -> entry.getValue().toArray(new String[0])));
You have to use :
.toArray(String[]::new)
Instead of just :
.toArray()
because this one return Object[] not a String[]
As discussed in the comments my solution can be valid from Java11