讀取文件從電腦

Question

現在我有這樣的錯誤：在線程 「主要」 java.lang.ArrayIndexOutOfBoundsException

例外：4 在Lotto1.main（Lotto1.java:37）

37號線：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

你沒有把正確的路徑進入的FileReader只進文件F，你可以通過˚F到的FileReader而不是重複的路徑：

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