Question

In java how would I read a text file with an unknown number of lines and store each line in a separate array.

Answer 1

public readFile()
{
try
{


FileInputStream fin = new FileInputStream(file);
//DataInputStream dis = new DataInputStream(fin); //needed for some data
BufferedReader br = new BufferedReader(new InputStreamReader(fin)); //needed to read line by line.

while(br.readLine != null)
{
//add to array here, increment what's needed etc.
}

Answer 2

I know I have to use that to read the text line by line but the problem I am having is assigning each line to a separate array so at the end I have an array for each line in the file and I can treat the arrays like rows and the same index in each array like columns. I also want to do it as though I don't know how many lines there are in the text but I do know the number of rows will be the same as the number of columns.

Answer 3

while(br.readLine != null)
{
//add to array here, increment what's needed etc.
}

Answer 4

so you could say String[] files as a global;

int lines = 0;
while(br.readLine != null)
{
lines++;
//add to array here, increment what's needed etc.
files = new String[lines];
files[lines-1] = br.readLine();
}

Answer 5

Won't that just store each line in as an element in the array files? I want to create an array of arrays with each line stored as a separate array, and I want to split the lines up like

Answer 6

so yo wan to make many 1 element arrays? Why...?

Answer 7

I figured it out, well I looked up a few different things and put them together. Not single element arrays I used split for each line. I used a 2D array which stored the array for each line. It was a magic squares problem and I needed to check that the columns and rows all added up to the same number so from there it was just a nested for loop another 2D array and an if statement.

Answer 8

sorry 1D array the second time to store all the row and column sums and then iterate through and check there values were all the same.