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Thread: read integers not text

  1. #1
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    Default read integers not text

    my code is below and i want to read only integers.BUT the text file is starting with text and it stops executing without reading the numbers.
    Also i want to add the 3 parameters of each line.
    Please help, thanks in advance.

     try{
            File fl = new File("C:/Users/Mario/Desktop/testing.txt");    
            //BufferedReader rd = new BufferedReader(new FileReader(fl));
            Scanner sc = new Scanner(fl).useDelimiter("\\s+");
            LinkedList<Integer> temps = new LinkedList<>();
            sc.useDelimiter(System.getProperty("line.separator"));
     
            while(sc.hasNext()){
             while(sc.next().matches("[0-9]+")){
                int num1=sc.nextInt();
                int num2=sc.nextInt();
                int num3=sc.nextInt();
                temps.add(num1+num2+num3);
     
             }
            }
     
            for(Integer dat:temps){
                System.out.println(dat);
            }
     
            }catch(Exception e){
                e.printStackTrace();
            }
        }


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    Super Moderator Norm's Avatar
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    Default Re: read integers not text

    i want to read only integers.BUT the text file is starting with text
    That's the way files are read. The bytes are read in the order they are in. You need to read the file's bytes up to where the integers are located.
    There is an exception if the byte location in the file for the integers is known, then the RandomAccessFile can be used to start reading the file at that location.
    If you don't understand my answer, don't ignore it, ask a question.

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