Splitting String into String Array Isn't Working Correctly

Question

for (int k = 0; k < dec2.length; k++) {
    System.out.println(dec2[k]);
    String[] tab = dec2[k].split(",");
    System.out.println(tab[0]);

When I try this code, dec2 is a String array containing:

41,31
11,21
42,41
12,22

When I try to display tab[0], I get the first number (before the ","), but tab[1] returns an ArrayIndexOutOfBoundsException, and I don't get why since it's supposed to contain the 2nd number (after the ",").

That indeed sounds like it should work. Does your `System.out.println(dec2[k])` really print the given list? — Chriki, Dec 23 '15 at 14:30
Yes it's exactly what is printed. I access tab[1] just after printing tab[0]. — FreeRide, Dec 23 '15 at 14:31

Kirill · Answer 1 · 2015-12-24T06:43:47.287

1

String[] dec2 = new String[] {"41,31", "11,21", "42,41", "12,22"};
for(int k = 0 ; k < dec2.length ; k++) {

    System.out.println(dec2[k]);
    String[] tab = dec2[k].split(",");


    System.out.println(tab[0]);
    System.out.println(tab[1]);
}

I got this output:

41,31
41
31
11,21
11
21
42,41
42
41
12,22
12
22

Process finished with exit code 0

No exceptions.

You can try to chek tab.length before get elements by index, or use forEach loop:

for(int k = 0 ; k < dec2.length ; k++) {

    System.out.println(dec2[k]);
    String[] tab = dec2[k].split(",");

    for (String part : tab) {
        System.out.println(part);
    }
}

edited Dec 24 '15 at 06:43

answered Dec 23 '15 at 14:40

Kirill

1,540
4
18
41

http://meta.stackoverflow.com/questions/277923/are-your-code-works-fine-for-me-answers-acceptable – Tom Dec 23 '15 at 14:48
Tom, my post contains answer, not only "you code works fine for me". – Kirill Dec 24 '15 at 06:42

Abdelhak · Answer 2 · 2015-12-23T15:38:36.313

0

Try this solution:

  for(int k = 0 ; k < dec2.length ; k++){

        System.out.println(dec2[k]);
        String [] tab = dec2[k].split(",");
        for (String string : tab) {
            System.out.print(string+" ");
        }
        System.out.println();

}

I create a foreach loop to iterate the array tab to exract both number like:

  for (String string : tab) {
            System.out.print(string+" ");
        }

Output:

And if you want use exact index try this you'll havr the same output:

 for(int k = 0 ; k < dec2.length ; k++){

        System.out.println(dec2[k]);
        String [] tab = dec2[k].split(",");
            System.out.print(tab[0]+" ");
            System.out.print(tab[1]);
        System.out.println();

    }

edited Dec 23 '15 at 15:38

answered Dec 23 '15 at 14:36

Abdelhak

8,299
4
22
36

While this does work, I think OP will find an underlying issue like poorly formatted input. I feel this treats the symptom, not the cause. – Clark Kent Dec 23 '15 at 14:40
When i just print it like you did, everything seems to work, but when i try to access an exact index of tab it doesn't seem to work, i don't get why. – FreeRide Dec 23 '15 at 15:03
@BBaldwin I tested it with exact index and seems work, see the answer above – Abdelhak Dec 23 '15 at 15:38

Splitting String into String Array Isn't Working Correctly

2 Answers2