How to increment array index

Question

I am using arraylist in my java program but the problem is that when i add an item in arraylist its adding on the same index so i want to know that how to increment array index in array list.

ArrayList arr = new ArrayList(500);
StringTokenizer st = new StringTokenizer(line, ":Mode set - Out of Service In Service");
while(st.hasMoreTokens()){
    arr.add(st.nextToken());
}

In above code its keep adding item on the same index i.e. arr[0].

do you want to delimit line by ":Mode set - Out of Service In Service"? — Prince John Wesley
– Prince John Wesley, Commented Jul 1, 2011 at 9:43

Giann · Accepted Answer · 2011-07-01 09:44:05Z

1

You can specify at what index the element must be added:

arr.add(index,st.nextToken());

answered Jul 1, 2011 at 9:44

Giann

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Comments

Bohemian · Accepted Answer · 2011-07-01 09:48:53Z

1

There's nothing wrong with your code. I don't believe that it would add to position zero.

Prove it by displaying the contents: System.out.println(arr);

edited Jul 1, 2011 at 9:48

answered Jul 1, 2011 at 9:43

Bohemian♦

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Comments

Alex Such · Accepted Answer · 2011-07-01 12:29:46Z

0

Do you really need to initalize the ArrayList size? Try your original code changing

ArrayList arr = new ArrayList(500);

for

ArrayList arr = new ArrayList();

answered Jul 1, 2011 at 12:29

Alex Such

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1 Comment

Ricky Over a year ago

ya i know that there is no need to initialize the arraylist size. I was experimenting something. Thanks for your concern,

Swift-Tuttle · Accepted Answer · 2011-07-01 09:47:55Z

0

Your code works fine. I cant see any problem.
How do you know whats the value at index 0, I mean are you debugging it?
Is that text really your delimiter ?

answered Jul 1, 2011 at 9:47

Swift-Tuttle

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2 Comments

Ricky Over a year ago

yes that text is my delimiter. It works fine but when i tried to print values of index 0 position the whole string displayed and when i tried to print index 1 value, it shows an error.

Ricky Over a year ago

thanks for reply. I was doing a silly mistake. Problem Solved finally.

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