java.io.IOException: Bad file descriptor

请问：bad file descriptor是什么错误？
这是源代码：[code=Java]import java.io.*;
public class FileTest2{
public static void main(String[] args){
FileOutputStream fos = null ;
try{
fos = new FileOutputStream("F:\\java_ex\\abc.txt");
}catch(FileNotFoundException fnf){
fnf.printStackTrace();
}
for(int i='A';i<'Z';i++){
try{
fos.write(i);
fos.close();
}catch(IOException ioe){
ioe.printStackTrace();
}
}
}
}[/code]
这是错误提示：
F:\java_ex>javac FileTest2.java

F:\java_ex>java FileTest
java.io.IOException: Bad file descriptor
  at java.io.FileOutputStream.write(Native Method)
  at FileTest.main(FileTest.java:38)
java.io.IOException: Bad file descriptor
  at java.io.FileOutputStream.write(Native Method)
  at FileTest.main(FileTest.java:38)
java.io.IOException: Bad file descriptor
  at java.io.FileOutputStream.write(Native Method)
  at FileTest.main(FileTest.java:38)
java.io.IOException: Bad file descriptor
  at java.io.FileOutputStream.write(Native Method)
  at FileTest.main(FileTest.java:38)
java.io.IOException: Bad file descriptor
  at java.io.FileOutputStream.write(Native Method)
  at FileTest.main(FileTest.java:38)
java.io.IOException: Bad file descriptor
  at java.io.FileOutputStream.write(Native Method)
  at FileTest.main(FileTest.java:38)
java.io.IOException: Bad file descriptor
  at java.io.FileOutputStream.write(Native Method)
  at FileTest.main(FileTest.java:38)
java.io.IOException: Bad file descriptor
  at java.io.FileOutputStream.write(Native Method)
  at FileTest.main(FileTest.java:38)
java.io.IOException: Bad file descriptor
  at java.io.FileOutputStream.write(Native Method)
  at FileTest.main(FileTest.java:38)
java.io.IOException: Bad file descriptor
  at java.io.FileOutputStream.write(Native Method)
  at FileTest.main(FileTest.java:38)
java.io.IOException: Bad file descriptor
  at java.io.FileOutputStream.write(Native Method)
  at FileTest.main(FileTest.java:38)
java.io.IOException: Bad file descriptor
  at java.io.FileOutputStream.write(Native Method)
  at FileTest.main(FileTest.java:38)
java.io.IOException: Bad file descriptor
  at java.io.FileOutputStream.write(Native Method)
  at FileTest.main(FileTest.java:38)
java.io.IOException: Bad file descriptor
  at java.io.FileOutputStream.write(Native Method)
  at FileTest.main(FileTest.java:38)
java.io.IOException: Bad file descriptor
  at java.io.FileOutputStream.write(Native Method)
  at FileTest.main(FileTest.java:38)
java.io.IOException: Bad file descriptor
  at java.io.FileOutputStream.write(Native Method)
  at FileTest.main(FileTest.java:38)
java.io.IOException: Bad file descriptor
  at java.io.FileOutputStream.write(Native Method)
  at FileTest.main(FileTest.java:38)
java.io.IOException: Bad file descriptor
  at java.io.FileOutputStream.write(Native Method)
  at FileTest.main(FileTest.java:38)
java.io.IOException: Bad file descriptor
  at java.io.FileOutputStream.write(Native Method)
  at FileTest.main(FileTest.java:38)
java.io.IOException: Bad file descriptor
  at java.io.FileOutputStream.write(Native Method)
  at FileTest.main(FileTest.java:38)
java.io.IOException: Bad file descriptor
  at java.io.FileOutputStream.write(Native Method)

  at FileTest.main(FileTest.java:38)
java.io.IOException: Bad file descriptor
  at java.io.FileOutputStream.write(Native Method)
  at FileTest.main(FileTest.java:38)
java.io.IOException: Bad file descriptor
  at java.io.FileOutputStream.write(Native Method)
  at FileTest.main(FileTest.java:38)
java.io.IOException: Bad file descriptor
  at java.io.FileOutputStream.write(Native Method)
  at FileTest.main(FileTest.java:38)

F:\java_ex>

[解决办法]

Java code

import java.io.*;public class  TestFile2{public static void main(String[] args){    File f=new File("E:\\javaex\\abc.txt");    FileOutputStream fos = null ;try{    if(f.exists())        f.createNewFile();fos = new FileOutputStream(f);}catch(Exception fnf){fnf.printStackTrace();}for(int i='A';i <'Z';i++){try{fos.write(i);}catch(IOException ioe){ioe.printStackTrace();}}try {    fos.close();}catch (Exception ex) {    ex.printStackTrace();}}}
[解决办法]
你要把所有的字符都输出到文件里面了再调用close（）关闭输出流
你的代码我帮你该了
错在你刚写入一个字符就关闭输出流了
[解决办法]
答：错误原因是：fos.close()放在for()循环中产生的。
解决方法：将fos.close()移到循环外面。即：在循环外面，加上：
try{
fos.close();
}catch(IOException e1){e1.printStackTrace();}
[解决办法]
Java code
 
 import java.io.FileNotFoundException; 
 import java.io.FileOutputStream; 
 import java.io.IOException; 
  
 class TestFile2 { 
 public static void main(String[] args) { 
  
 FileOutputStream fos = null; 
 try { 
 fos = new FileOutputStream("E:\\java_ex\\abc.txt"); 
 for (int i = 'A'; i  < 'Z'; i++) { 
 try { 
 fos.write(i); 
 } catch (IOException ioe) { 
 ioe.printStackTrace(); 
 } 
 } 
 } catch (FileNotFoundException fnf) { 
 fnf.printStackTrace(); 
 }finally{ 
 try { 
 fos.close(); 
 } catch (IOException e) { 
 e.printStackTrace(); 
 } 
 } 
  
 } 
 }