words = _objectWrappers.wrap(
    _arrays.arrayOf(_plugins.loadClass("java.lang.String"), "hello", "world", "kotlin", "android"))
# 按单词长度分组
wordsByLength = words.groupBy(lambda it: _objectWrappers.wrap(it).count(), lambda it: it)
# 输出：按长度分组的单词: {5=[hello, world], 6=[kotlin], 7=[android]}
_console.log("按长度分组的单词: ", wordsByLength)