求大神指导!!!

求详细解答

1. BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
   
2.     BufferedWriter bw=new BufferedWriter(new FileWriter("文件路径\\名"));
   
3.     String line=null;
   
4.     while((line=br.readLine())!=null){
   
5.             bw.write(line);
   
6.     }
   
7.     br.close();
   
8.     bw.close();
   
9.         }
   
10. 
    
11. }
    

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