local words = _objectWrappers:wrap(_arrays:arrayOf(_plugins:loadClass("java.lang.String"), "hello", "world", "kotlin",
        "android"))
-- 按单词长度分组，并获取每个分组的大小,每个分组的大小: {5=2, 6=1, 7=1end)
words:groupingBy(function(it)
    return _objectWrappers:wrap(it):count()
end) :eachCount():forEach(function(it)
    _console:log(it)
end)