把数字写到文件中出错
import   java.io.*;

public   class   Test
{
public   static   void   main(String[]   args)   throws   Exception
{
    byte[]   a   =   new   byte[10];
    for(byte   i   =   0;   i   <   10;   i++)
      a[i]   =   i;
    File   f   =   new   File( "file.txt ");
    FileWriter   fw   =   new   FileWriter(f);
    fw.write(new   String(a));
    fw.close();
   
    FileReader   fr   =   new   FileReader(f);
    char[]   b   =   new   char[1024];
    int   len   =   fr.read(b);
    System.out.println(new   String(b,0,len));
}
}

我想把0~9这九个数写到文件中，为什么不行呢？


------解决方案--------------------
那是字节,不是字符.
a[i]=(byte)( '0 '+i);
看看.
------解决方案--------------------
楼上正解！
------解决方案--------------------
import java.io.*;

public class Test
{
public static void main(String[] args) throws Exception
{
char[] a = new byte[10];
for(char i = '0 '; i < '0’+10; i++)
a[i] = i;
File f = new File( "file.txt ");
FileWriter fw = new FileWriter(f);
fw.write(a);
fw.close();

FileReader fr = new FileReader(f);
char[] b = new char[1024];
int len = fr.read(b);
System.out.println(new String(b,0,len));
}
}