ArrayList get() method not returning first index value

Question

I created an arrayList to store String values.When i am going to fetch values from my arrayList it doesn't return me the first value of it;s 0th index.

ArrayList<String> arrayList = new ArrayList<String>();
Scanner scan= new Scanner(System.in);
int noInput=scan.nextInt();

for(int i=0; i < noInput/2; i++)
   arrayList.add(scan.nextLine());       

for(int i=0;i<arrayList.size();i++)
   System.out.println("ArrayList:"+arrayList.get(i) + " "  + i );

The problem is much more likely that you didn't add to the ArrayList what you thought you added. Focus your debug efforts on what is going into the ArrayList. — Patricia Shanahan, Jan 21 '15 at 10:42
Yeah, i can understand that thing.but still i am not able to identify the problem.can u help me figuring this problem — Sumit Kandoi, Jan 21 '15 at 10:43
possible duplicate of [Scanner issue when using nextLine after nextXXX](http://stackoverflow.com/questions/7056749/scanner-issue-when-using-nextline-after-nextxxx) — Tom, Jan 21 '15 at 10:47

roeygol · Answer 1 · 2015-01-21T10:49:01.170

2

Use scan.next() instead of scan.nextLine().

edited Jan 21 '15 at 10:49

answered Jan 21 '15 at 10:42

roeygol

4,908
9
51
88

score 1 · Answer 2 · answered Jan 21 '15 at 10:42

1

Because Scanner#nextInt reads only the int value, then nextLine in the first iteration will consume the remaining \n (the enter you hit after you entered the integer value).

To fix this, add nextLine after nextInt or use next instead of nextInt.

answered Jan 21 '15 at 10:42

Maroun

94,125
30
188
241

score 0 · Answer 3 · answered Jan 21 '15 at 10:47

It is probably because your list is never filled. I think the first loop isn't gone into, so nothing is added to the array.
for(int i=0; i < noInput/2; i++) arrayList.add(scan.nextLine());

Try debugging it or printing the size of the arraylist

ArrayList get() method not returning first index value

3 Answers3