Null pointer access: The variable data can only be null at this location

Question

Okay, that's what I've got:

        String[] data = null;
    String[] data2 = null;
    String[] datas = res.split("(s1)");
    int i1 = 0;
    int i2 = 0;
    for(String datasx : datas)
    {
        i1++;
        String[] datas2 = datasx.split("(s2)");

        for(String datas2x : datas2)
        {
            String[] odcinek = datas2x.split("(s3)");
            data[i2] = odcinek[1] + "////" + odcinek[2] + "////" + odcinek[6];
            i2++;
        }
    }

And it's not working. Application crashes on this line:

data[i2] = odcinek[1] + "////" + odcinek[2] + "////" + odcinek[6];

Actually, Eclipse gives me the following warning on it:

Null pointer access: The variable data can only be null at this location

but I have no idea what's wrong. Can anybody help? Thanks.

Answer 1

Seem like you required dynamic list, so what you need is replace String[] data = null; to use List

List data = new ArrayList<String>();
String[] data2 = null;
String[] datas = res.split("(s1)");
         
int i1 = 0;
int i2 = 0;
     
for (String datasx : datas) {
    i1++;
    String[] datas2 = datasx.split("(s2)");

    for (String datas2x : datas2) {
        String[] odcinek = datas2x.split("(s3)");
        data.add(odcinek[1] + "////" + odcinek[2] + "////" + odcinek[6]);
        i2++;
    }
}

Answer 2

You are initializing the array data to be null, when you try to access it it gives you null pointer access error.

You must initialize it to the appropriate type before you try to acces it i.e. initialize it to String[] instead of null.