Saving null data to string file

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hondaman9..

Saving null data to string file

in Programming Questions • 1 year ago

I can't seem to find an answer to this, but I'm using a string array which is dimensioned with enough places to accommodate the range of data I'm generating. That means that most of the time when I use saveString to save the array to an ASCII file there's a ton of "null" lines at the end of the file after the relevant data lines. Is there any way to "trim" a string array before I send it to file?

Thanks in advance

Replies(3)

PhiLho

Re: Saving null data to string file

1 year ago

See if the shorten() function is what you look for.

hondaman9..

Re: Saving null data to string file

1 year ago

As ever phi.lho, many thanks for the succinct answer. Since I set (and therefore know) the length of the array (10K) I can trim backwards incrementally to one before the last slot I filled. The following works perfectly.

for (int s= 10000; s>n+3; s--) {
list = shorten(list);
}

PhiLho

Re: Saving null data to string file

1 year ago

Ah, I thought shorten() could take a parameter. But it doesn't.
If you want something more efficient and simpler, you can use:

String[] shortList = Arrays.copyOf(list, n); // Copy only the first n entries

Or just use an array list to generate data, it will adjust to the needed length. You can convert it to an array to use saveStrings():

String[] toSave = arrayList.toArray(new String[arrayList.size()]);

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