CODEWITHSUNDEEP
javajava.util.scanner
Ryan Sayles
Ryan Sayles

Reputation: 3441

Java scanner issue

I'm having problems reading in a text file with java. The text file has the following format:

String
String
String
String

Int 
Int
Int 
Int

With each String and int value having a new line character at the end and a blank line in between the stings and ints. I want to save each string value into a string array but I can't quite figure out how to get the scanner to stop at the blank line. I tried various methods such as going until there is an int, going until the value of hasNext is " ", and trying to just read the strings but nothing is working. Can someone provide anyhelp?

Upvotes: 1

Views: 275

Answers (3)

lrAndroid
lrAndroid

Reputation: 2854

while (mScanner.hasNextLine()){
    String line = mScanner.nextLine();
    if (line.length() == 0)
        break;
    else
        mArrayList.add(line);//do stuff
}

Upvotes: 0

Jean Logeart
Jean Logeart

Reputation: 53849

Not sure from your example if you have exactly 4 Strings and 4 Integers or more, so something like the following should work:

List<String> strings = new ArrayList<String>();
List<Integer> ints = new ArrayList<Integer>();

while(scanner.hasNext() && !scanner.hasNextInt()) {
    strings.add(scanner.next());
}
while(scanner.hasNextInt()) { // If you also want to store the ints
    ints.add(scanner.nextInt());
}

Upvotes: 4

user unknown
user unknown

Reputation: 36259

public static void main (String [] args)
{
    Scanner sc = new Scanner (System.in);
    int count = 0;
    while (sc.hasNext ())
    {
        String s = sc.next ();
        ++count;
        System.out.println (count + ": " + s);
        if (count == 4) 
            break;
    }
    while (sc.hasNext ())
    {
        int i = sc.nextInt ();
        System.out.println (count + ": " + i);
    }
}

cat dat

Foo

Bar

Foobar

Baz

1

2

4

8

Test: cat dat | java ScanIt

1: Foo
2: Bar
3: Foobar
4: Baz
4: 1
4: 2
4: 4
4: 8

From the original question I had, as you see, a slightly different idea about the file format, but you see: I don't do anything special for newlines or empty newlines.

So the program should work for you too.

Upvotes: 0

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