<?php
$words = $objectWrappers->wrap($arrays->arrayOf($plugins->loadClass("java.lang.String"), "hello", "world", "kotlin"));
// 将每个单词转换为字符列表，并添加索引信息, 带索引的字符列表: [0_h, 0_e, 0_l, 0_l, 0_o, 1_w, 1_o, 1_r, 1_l, 1_d, 2_k, 2_o, 2_t, 2_l, 2_i, 2_n]
$words->flatMapIndexed(function ($index, $word) use ($objectWrappers) {
    return $objectWrappers->wrap($word)->map(function ($c) use ($index) {
        return $index . "_" . $c;
    })->getOrigin();
})->forEach(function ($it) use ($console) {
    $console->log($it);
});