java从键盘输入一些字符串，并将字符串保存到一个文件中

import java.io.*;
public class Test
{
public static void main(String[] args) throws IOException
{
    BufferedReader buf = new BufferedReader (new InputStre amReader(System.in));  
    BufferedWriter buff = new BufferedWriter(new FileWriter("abc.txt"));
    String str = buf.readLine();
    while(!str.equals("exit"))
    {
     buff.write(str);
     buff.newLine();
     str = buf.readLine();
    }
    buf.close();
    buff.close();  
}
}