Here you can find the source of toList(Iterable i)
public static <E> List<E> toList(Iterable<? extends E> i)
//package com.java2s; /*//w ww . j a v a 2 s . c o m * Copyright 2013 University of Southern California * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */ import java.util.*; public class Main { public static <E> List<E> toList(Iterable<? extends E> i) { return toList(i, 10); } public static <E> List<E> toList(Iterable<? extends E> i, int sizeHint) { ArrayList<E> list = new ArrayList<>(sizeHint); for (E e : i) { list.add(e); } list.trimToSize(); return list; } }