CODEWITHSUNDEEP
javajava.util.scanner
Ruru Morlano
Ruru Morlano

Reputation: 209

Using Scanner object to read series of inputs

I have to retrieve three inputs an integer, a string and a double; here is how I thought i would do [Note:The String containing a space]

record.setAccountNumber(input.nextInt());
record.setName(input.nextLine());
record.setBalance(input.nextDouble());

I tried to replace input.nextLine() in 

record.setName(input.nextLine());

with input input.next(), because of an InputMisMatchException but still the problem is not resolved. the error is thrown because a double value is probably assigned to a new line value[this is what I think not sure] is there a way to retrieve the string containing a space and be able to finish the three inputs I have to enter at the same time. thanks

NOTE: I couldn't find any relating problem to this one Let me just add the whole method within which the error occurs

public void addAccountRecords(){
    AccountRecord record = new AccountRecord();
    input = new Scanner (System.in);

    try {
        output = new Formatter("oldmast.txt");
    } catch (FileNotFoundException e) {
        System.err.println("Error creating or opening the file");
        e.printStackTrace();
        System.exit(1);
    } catch (SecurityException e){
        System.err.println("No write access to this file");
        e.printStackTrace();
        System.exit(1);
    }


    System.out.println("Enter respectively an account number\n"+
            "a name of owner\n"+"the balance");

        while ( input.hasNext()){
            try{
                record.setAccountNumber(input.nextInt());
                record.setName(input.nextLine());
                record.setBalance(input.nextDouble());

                if (record.getBalance() >0){
                    output.format("%d\t%s\t%,.2f%n",record.getAccountNumber(),
                            record.getName(),record.getBalance());
                    record.setCount((record.getCount()+1));
                }else
                    System.err.println("The balance should be greater than zero");

            }catch (NoSuchElementException e){
                System.err.println("Invalid input, please try again");
                e.printStackTrace();
                input.nextLine();

            }catch (FormatterClosedException e){
                System.err.println("Error writing to File");
                e.printStackTrace();
                return;
            }
            System.out.println("Enter respectively an account number\n"+
                    "a name of owner\n"+"the balance\n or End of file marker <ctrl> z");
        }//end while
        output.close();
        input.close();

}//end AddAccountRecords

Upvotes: 0

Views: 1688

Answers (1)

assylias
assylias

Reputation: 328598

nextLine will read all the remaining data to the end of your string, including the double. You need to use next instead. I'm not sure why you get an InputMisMatchException - this works for example:

String s = "123 asd 123.2";
Scanner input = new Scanner(s);
System.out.println(input.nextInt());    //123
System.out.println(input.next());       //asd
System.out.println(input.nextDouble()); //123.2

So the issue is possibly in your input or somewhere else in your code.

Notes:

  • If I use Scanner input = new Scanner(System.in); and enter 123 asd 123.2 I get the same result.
  • if the string (second entry) contains spaces, the second word will be parsed as double and will generate the error your report

Upvotes: 1

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