Here you can find the source of readLine()
public static final String readLine()
//package com.java2s; /*/* w w w .j ava 2 s . com*/ * This software is a city building and resource management strategy game. * Copyright (C) 2018 Javier Centeno Vega * * 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.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; public class Main { private static final BufferedReader INPUT_READER = new BufferedReader(new InputStreamReader(System.in)); public static final String readLine() { String result = ""; try { result = INPUT_READER.readLine(); } catch (IOException e) { e.printStackTrace(); } return result; } public static final String readLine(String request) { System.out.println(request); return readLine(); } }