Here you can find the source of readLine(BufferedReader reader, StringWriter writer)
protected static boolean readLine(BufferedReader reader, StringWriter writer) throws IOException
//package com.java2s; /*// w ww . j a va 2s. c om * Copyright 2008 Sun Microsystems, Inc. All Rights Reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER * * This code is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 * only, as published by the Free Software Foundation. * * This code 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 version 2 for more details (a copy is * included in the LICENSE file that accompanied this code). * * You should have received a copy of the GNU General Public License * version 2 along with this work; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA * * Please contact Sun Microsystems, Inc., 16 Network Circle, Menlo * Park, CA 94025 or visit www.sun.com if you need additional * information or have any questions. */ import java.io.*; public class Main { protected static boolean readLine(BufferedReader reader, StringWriter writer) throws IOException { boolean encounteredCr = false; while (true) { int read = reader.read(); if (read == -1) { return encounteredCr; } if (read == '\r') { encounteredCr = true; } else if (read == '\n') { return encounteredCr; } else { writer.write(read); } } } }