How to populate an array list in a while loop

Question

My problem is this

Scanner sf = new Scanner(f);
ArrayList<String> teamArr = new ArrayList<String>();
int counterPopulate = 0;

while(sf.hasNextLine()){
    teamArr[counterPopulate] = sf.nextLine();
    counterPopulate++;           
}

Any solutions, this is surrounded by a try catch. Getting the problem at this part teamArr[counterPopulate] = sf.nextLine();

are you getting an `index out of bounds` exception? if not, what exception are you getting — Sam I am says Reinstate Monica, Oct 24 '13 at 14:19
@SamIam I don't even think you can run the code the way he's trying to add to the ArrayList — Kakalokia, Oct 24 '13 at 14:22
advise for future questions: please provide an error message if there's one. in this example it's kinda obvious to the professional eye but this information makes it easier to help you with more complex problems — xmoex, Oct 24 '13 at 14:44

score 5 · Accepted Answer · answered Oct 24 '13 at 14:19

Because ArrayList is different than normal arrays, you need to use methods of the ArrayList class to populate the ArrayList.

In your case you need to do:

while(sf.hasNextLine()){
            teamArr.add(sf.nextLine());
        }

Assuming you're using Java.

Have a look at http://docs.oracle.com/javase/7/docs/api/java/util/ArrayList.html

score 1 · Answer 2 · answered Oct 24 '13 at 15:05

As you are using ArrayList<String>, add(String value) method is used to add new String Object into the ArrayList.

A simple solution of your problem is given below.

assuming that language is JAVA.

Scanner sf = new Scanner(f);
ArrayList<String> teamArr = new ArrayList<String>();

while( sf.hasNextLine() ) {
    teamArr.add(sf.nextLine());
}

for more details about ArrayList and Collection please refer :

http://docs.oracle.com/javase/7/docs/api/java/util/ArrayList.html

http://docs.oracle.com/javase/7/docs/api/java/util/Collection.html

How to populate an array list in a while loop

2 Answers2

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