這個程序爲什麼不寫任何內容到輸出文件？

Question

import java.io.FileReader; 
import java.io.FileWriter; 
import java.io.BufferedReader; 
import java.io.BufferedWriter; 
import java.io.FileNotFoundException; 
import java.util.Scanner; 
public class Letter_Counter 
{ 
    public static void main(String[] args) throws Exception 
    { 
     String filename = ""; 
    String outFile = ""; 
    FileReader fr1 = null; 
    FileWriter fw1 = null; 
    BufferedReader br1 = null; 
    BufferedWriter bw1 = null; 
    Scanner myScan = new Scanner(System.in); 
    boolean isValid = true; 
    int[] count = new int[56]; 

    do 
    { 
     try 
     { 
      isValid = true; 
      System.out.print("Input a file name: "); 
      filename = myScan.nextLine(); 
      fr1 = new FileReader(filename); 
      br1 = new BufferedReader(fr1); 
     } 
     catch(FileNotFoundException e) 
     { 
      System.out.println("Invalid filenme given. Input another."); 
      isValid = false; 
     } 
    }while(!isValid); 

    do 
    { 
     try 
     { 
      isValid = true; 
      System.out.print("Input an out file name: "); 
      outFile = myScan.nextLine(); 
      fw1 = new FileWriter(outFile); 
      bw1 = new BufferedWriter(fw1); 
     } 
     catch(Exception e) 
     { 
      System.err.println("Error: "+e.getMessage()); 
      isValid = false; 
     } 
    }while(!isValid); 

    System.out.println("Reading from "+filename); 

    try 
    { 
     String line; 

     while((line = br1.readLine()) != null) 
     { 
      System.out.println(line); 
      for(int i=0; i<line.length(); i++) 
      { 
       for(int j=97; j<123; j++) 
       { 
        if((int)line.charAt(i)==j) 
        { 
         count[j-97]++; 
        } 
       } 
       for(int k=65; k<91; k++) 
       { 
        if((int)line.charAt(i)==k) 
        { 
         count[k-38]++; 
        } 
       } 
      } 
     } 
    } 
    catch(Exception e) 
    { 
     System.err.println("Error: "+e.getMessage()); 
    } 

    try 
    { 
     char c = 'A'; 
     for(int i=26; i<52; i++) 
     { 
      bw1.write(c+"="+count[i]); 
      System.out.println(c+"="+count[i]); 
      bw1.newLine(); 
      c++; 
     } 
     c = 'a'; 
     for(int i=0; i<26; i++) 
     { 
      bw1.write(c+"="+count[i]); 
      System.out.println(c+"="+count[i]); 
      bw1.newLine(); 
      c++; 
     } 
    } 
    catch(Exception e) 
    { 
     System.err.println(e.getMessage()); 
    } 

    System.out.println("Results stored in "+outFile); 
} 
} 

很抱歉的壞壓痕.. 它打印精細到控制檯，但不會寫什麼我使用了錯誤的語法寫 ，因爲它不拋出任何異常或者文件.. 任何與所有的幫助表示讚賞

Answer 1

沒關係..想通了..我只是忘了關緩衝..

Answer 2

你沒忘了在年底前完成的BufferedWriter？

bw1.close(); 

Answer 3

只是輸入/輸出文件名的路徑名正確。 並在這樣的belwo地方關閉fw1。

System.out.println("Results stored in "+outFile); 
    fw1.close();