ArrayList compiler error

Question

I am trying to make an array list in Java in two spots, but I don't know what I am doing wrong. It says an array is required, but I don't know what that means because I am using an array list.

This is the line that's being messed up:

static char rSpaces(String problem, int count)
{
    num.add(problem.charAt(count));
    char no = num[count];
    return no;
}

If this helps, this is the line I created the array list in (I already imported it):

static ArrayList<Character> num = new ArrayList<Character>();

zw324 · Accepted Answer · 2013-05-10 18:54:16Z

5

num[count] is wrong, since num is not an array. Use num.get(count) instead.

answered May 10, 2013 at 18:54

zw324

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Comments

rgettman · Accepted Answer · 2013-05-10 18:54:27Z

2

An ArrayList is not an array, so you can't use the array element [] syntax here.

With an ArrayList, use the get method to access an element.

answered May 10, 2013 at 18:54

rgettman

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Comments

flavian · Accepted Answer · 2013-05-10 18:54:54Z

2

You should use ArrayList.get to access the elements of an ArrayList. Change that to:

  char no = num.get(count);

answered May 10, 2013 at 18:54

flavian

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Comments

Francisco Spaeth · Accepted Answer · 2013-05-10 18:58:59Z

0

Java array and ArrayList are different things.

You could access the size of the ArrayList by using method size as follows:

static char rSpaces(String problem, int count)
{
    num.add(problem.charAt(count));
    char no = num.get(count);
    return no;
}

If you want to access it as an array, you could "export" it using the toArray method as follows:

...
Character[] myArray = num.toArray(new Character[]{})
Character c = myArray[count];
...

answered May 10, 2013 at 18:58

Francisco Spaeth

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Comments

Alpesh Gediya · Accepted Answer · 2013-05-10 18:59:07Z

0

To access element of array use index operation using [] operator num[count] while in case of ArrayList you need to use get(count) method.

answered May 10, 2013 at 18:59

Alpesh Gediya

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