写一个程序 要求当程序启动的时候自键盘读入用户所输入的信息，并存在一个文件中，直到用户输入“end”

import java.util.*;
import *;
public class InPutT {
    public static void main(String[] args){
        File f = new File("gang","save.txt");
        if(f.exists()){
            System.out.println("位置" + f.getAbsolutePath());
            System.out.println("大小" + f.length());
            }
        else{
            try{
                f.getParentFile().mkdirs();
                      f.createNewFile();
            
        }catch( IOException er){
                System.out.println("有误");
                }
            }    
                
    
        InputStreamReader inp = new InputStreamReader(System.in);
          BufferedReader buf = new BufferedReader(inp);
    try{
             FileOutputStream fis = new FileOutputStream("save.txt");
      / *String str = "";
       while(str.indexOf("end") != -1){
               str = buf.readLine();
           }这一段不知道怎么写了*/
        int c;
        while((c = buf.read()) != -1 ){
            fis.write(c);
         }
                fis.close();
        }catch(IOException ke){
            System.out.println();
        }
    }
}