local wm = _objectWrappers:wrap(_maps:mutableMapOf())
local words = _objectWrappers:wrap(_arrays:arrayOf(_plugins:loadClass("java.lang.String"), "hello", "world", "kotlin",
        "android"))
-- 按单词长度分组
words:groupByTo(wm, function(it)
    return _objectWrappers:wrap(it):count()
end, function(it)
    return it
end)
-- 输出：按长度分组的单词: {5=[hello, world], 6=[kotlin], 7=[android]end)
_console:log("按长度分组的单词: ", wm)