java编写一个程序,从键盘输入一串字符,从屏幕输出并将其存入a.txt文件中。

import java.io.BufferedWriter;

import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;

public class OutputA {
       public static void main(String [] args){
              Scanner sc=new Scanner(System.in);
              String s=sc.nextLine();
              System.out.println("写入字符串 : "+s);
           try {
                   BufferedWriter bw=new BufferedWriter(new FileWriter("d:\\a.txt"));
                         bw.write(s);
                         bw.flush();
                         bw.close(); //关闭流
             } catch (IOException e) {
                      e.printStackTrace();
            }
       }
}