JAVA：阅读txt并使用StringTokenizer获取元素

Question

i got an error problem! I open my file i read a line and then i take information from the line with StringTokenizer

my code works with one line but when i am trying to read another i got an error any help ?

here is my code

try{

    line = reader.readLine();

        while(line!=null){
            StringTokenizer st = new StringTokenizer(line,"\t");

             timer=st.nextToken("\t");
             int Itimer=Integer.parseInt(timer);
            // System.out.println(Itimer);
             what_to_do=st.nextToken("\t");
            // System.out.print(what_to_do);
             flightnumber=st.nextToken();
        int  Iflightnumber=Integer.parseInt(flightnumber);
            // System.out.print(Iflightnumber);
             departure=st.nextToken("\t");
            // System.out.print(departure);
             flighttime=st.nextToken("\t");

         int Iflighttime=Integer.parseInt(flighttime);
        // System.out.print(Iflighttime);
             Key=new KeyFlight(Iflightnumber,Iflighttime);
             flight=new Flight(Key,true);
             if(what_to_do.equals("insert")){
            // System.out.print("worked");
             if(departure.equals("D")){
                 result=true;
             }else{result=false;}
             flight.setdeparture(result);//8a mporousa na kanw new flight alla gia e3ikonomisi to ekana me seter//
             EV.insert(flight);
            // System.out.println("worked again");


             }else if(what_to_do.equals("cancel")){
                 EV.remove(Key);
                                 }
             else if(what_to_do.equals("update")){
                 EV.UpdateKey(flight, Key);
             }
            line=reader.readLine();

and these are the errors Exception in thread "main" java.util.NoSuchElementException at java.util.StringTokenizer.nextToken(Unknown Source) at java.util.StringTokenizer.nextToken(Unknown Source) at FlightSchedule.loadandStoreFile(FlightSchedule.java:54) at FlightSchedule.main(FlightSchedule.java:13)

i wrote instead of last reader.readLine(), line=null and it worked

Code is ok its a StringTokenizer problem

examble of my txt format: 0 insert 370 D 425

Answer 1

问题可能是，您正在stringTokenizer上寻找选项卡“ \\ t”，也许您之间的空间不是选项卡只是空白，请尝试使用更好的line.split（“ \\ s +”）