I don't know how to use a function of the Scanner class

Question

so I have to do a Flask Machine assignment and I have a small problem with the scanner class. I created a method in which I want to add the bottle types(A B or C) to an arraylist. So I don't really know how many bottles I will enter. The thing is I want my scanning to stop once I encounter a ,,0". I know I have to use a while loop but using it like this doesn't work because by the time I want to add the bottle to the list, it jumps to the next scanned bottle.

 While(input.next()!="0"){
  list.add(input.next());
  count++;

}

Please.. everyone on earth, stop using `==` for comparing Strings. I beg you. — Maroun, Oct 03 '13 at 09:01

score 1 · Accepted Answer · edited May 23 '17 at 11:53

1

You should store the result of the input.next() callback in a variable and terminate the loop if it's equal to 0. For example:

while (true) {
   String next = input.next();
   if ("0".equals(next)) break;
   else {
      list.add(next);
      count++;
   }
}

More info about:

edited May 23 '17 at 11:53

Community

1
1

answered Oct 03 '13 at 08:54

Konstantin Yovkov

59,030
8
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score 1 · Answer 2 · answered Oct 03 '13 at 08:57

1

You call next() twice. Store the first value.

String next;
while (!(next = input.next()).equals("0"))
{
    list.add(next);
    count++;
}

answered Oct 03 '13 at 08:57

RobAu

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8
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108

I don't know how to use a function of the Scanner class

2 Answers2