<?php
$words = $objectWrappers->wrap($arrays->arrayOf($plugins->loadClass("java.lang.String"), "hello", "world", "kotlin", "android"));
// 按单词长度分组
$wordsByLength = $words->groupBy((function ($it) use ($objectWrappers) {
    return $objectWrappers->wrap($it)->count();
}), function ($it) {
    return $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);