Here you can find the source of readFileToLines(File file)
public static ArrayList<String> readFileToLines(File file) throws IOException
//package com.java2s; /*/*from w w w. j a v a2 s.c o m*/ * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License, Version 1.0 only * (the "License"). You may not use this file except in compliance * with the License. * * You can obtain a copy of the license at legal-notices/CDDLv1_0.txt * or http://forgerock.org/license/CDDLv1.0.html. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at legal-notices/CDDLv1_0.txt. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: * Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END * * * Copyright 2006-2010 Sun Microsystems, Inc. * Portions Copyright 2011-2015 ForgeRock AS * Portions Copyright 2013 Manuel Gaupp */ import java.io.*; import java.util.*; public class Main { /** * Returns the contents of file as a List of the lines as defined by * java.io.BufferedReader#readLine() (i.e. the line terminator is not * included). An ArrayList is explicitly returned, so that callers know that * random access is not expensive. */ public static ArrayList<String> readFileToLines(File file) throws IOException { BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(file))); ArrayList<String> lines = new ArrayList<>(); String line; while ((line = reader.readLine()) != null) { lines.add(line); } return lines; } }