Here you can find the source of asList(Iterable
public static <T> List<T> asList(Iterable<T> iteratable)
//package com.java2s; /*// w w w . jav a2s . c o m * IterationUtils.java Copyright (C) 2019. Daniel H. Huson * * (Some files contain contributions from other authors, who are then mentioned separately.) * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ import java.util.*; public class Main { public static <T> List<T> asList(Iterable<T> iteratable) { return asList(iteratable, new ArrayList<>()); } public static <T> List<T> asList(Iterable<T> iteratable, List<T> list) { for (T value : iteratable) { list.add(value); } return list; } }