Here you can find the source of readLine(InputStream in, OutputStream out)
private static void readLine(InputStream in, OutputStream out) throws IOException
//package com.java2s; /* Copyright (c) 2010, Avian Contributors //from w ww.j a v a 2 s .c om Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. There is NO WARRANTY for this software. See license.txt for details. */ import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; public class Main { private static void readLine(InputStream in, OutputStream out) throws IOException { while (true) { int c = in.read(); switch (c) { case ' ': case '\r': case '\t': break; case '\n': case -1: return; default: out.write(c); } } } }