如何展平 JsonLists 的嵌套数组

Question

[[{header=C, value=dsd}, {header=D, value=test}, {header=E, value=e}, {header=F, value=hhh}, {header=G, value=ghgh}]]

Above is an array of arrays of JsonLists and I need to flatten out the outer array to just be the inner array of JsonLists.

I'd also eventually get only the values out of the JsonList and put those values into it's own separate array:

[dsd, test, e, hhh, ghgh]

Answer 1

It's basically similar to flattening an ArrayList of ArrayList.

final List<Map<String, Object>> result = jsonList.stream()
                .flatMap(Collection::stream)
                .collect(Collectors.toList());

and for the values

final List<Object> valueList = result.stream()
                .map(i -> i.get("value"))
                .collect(Collectors.toList());