Here you can find the source of readLines(File file)
public static List<String> readLines(File file) throws IOException
//package com.java2s; import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.io.IOException; import java.util.ArrayList; import java.util.List; public class Main { public static List<String> readLines(File file) throws IOException { List<String> lines = new ArrayList<String>(); BufferedReader reader = new BufferedReader(new FileReader(file)); String line = null;/* w ww . ja va2 s .c om*/ String ls = System.getProperty("line.separator"); while ((line = reader.readLine()) != null) { StringBuilder sb = new StringBuilder(); sb.append(line); sb.append(ls); lines.add(sb.toString()); } return lines; } }