从计算机中读取文件

现在我有这个错误：

线程“main”中的exceptionjava.lang.ArrayIndexOutOfBoundsException：4在Lotto1.main（Lotto1.java:37）

第37行：arr [count] [0] = s.next（）+“”+ s.next（）;

import java.io.*; import java.util.*; public static void main(String[] args) throws IOException { File f = new File("D:\\Filipe\\Project Final\\src\\database_lotto.txt"); Scanner s; try { s = new Scanner(f); BufferedReader reader = new BufferedReader(new FileReader(f)); int lines = 0; while (reader.readLine() != null) { lines++; } reader.close(); arr = new String[lines][3]; int count = 0; //while theres still another line while (s.hasNextLine()){ arr[count][0] = s.next() + ""+ s.next(); arr[count][1] = s.next(); arr[count][2] = s.next(); count++; } } catch (FileNotFoundException ex) { System.out.println("File does not exist"); } 

Answer 1

您没有将正确的路径放入FileReader只进入File f，您可以将f传递给Filereader而不是重复路径：

 File f = new File("D:\\database_lotto.txt"); [...] BufferedReader reader = new BufferedReader(new FileReader(f));