Pfthb

So basically, I'm trying to save several data saved from a file into an Array therefor I need to somehow get the size that the Array must be initialized to.

Is there any way to do that without creating another loop to count all the lines until the read line is null? Since that would require to re-open the file later which would not be very optimal. I'm trying to keep it as compact as possible.

Also, no I can't use ArrayLists.

I would go for an ArrayList, as Haroon and Hovercraft.

However, if it is not an option, why not :

// 1. Create a new Set of String
Set<String> stringSet = new HashSet<String>();
// 2. Loop through bufferedReader and add lines to set
for (String line = br.readLine(); line != null; line = br.readLine()) 
stringSet.add(line);

// 3. Copy set to a new array
int n = stringSet.size(); 
String array = new String[n]; 
array = stringSet.toArray(array);

But don't expect huge performances.

You can get the total number of lines by :

long count = Files.lines(Paths.get(PATH)).count();

Now you can create an array using count

String numOfLines = new String [(int) count];

The Files.lines(Path path) internally uses BufferedReader to read the file.

If you know in advance how many lines there will be you create the array before the loop and then you will need a counter which you use an an index into the array. You increment the counter each time through the loop.

If the number of lines is variable then add the lines to an ArrayList in the loop and then convert the ArrayList to an array after the loop