Here you can find the source of readAllLines(File file)
public static String[] readAllLines(File file) throws IOException
//package com.java2s; /**// w w w . ja va 2 s .c om * * Copyright 2017 Florian Erhard * * 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.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.util.LinkedList; import java.util.List; public class Main { public static String[] readAllLines(InputStream stream) throws IOException { List<String> re = new LinkedList<String>(); BufferedReader br = new BufferedReader(new InputStreamReader(stream)); String line; while ((line = br.readLine()) != null) re.add(line); br.close(); return re.toArray(new String[re.size()]); } public static String[] readAllLines(File file) throws IOException { return readAllLines(new FileInputStream(file)); } }