I'm trying to write a matrix into a text file. In order to do that I'd like to know how to write an array into a line in the text file.
I'll give an example:
int [] array = {1 2 3 4};
I want to have this array in text file in the format:
1 2 3 4
and not in the format:
1
2
3
4
Can you help me with that?
Thanks a lot
Here is a naive approach
//pseudocode
String line;
StringBuilder toFile = new StringBuilder();
int i=0;
for (;array.length>0 && i<array.length-2;i++){
toFile.append("%d ",array[i]);
}
toFile.append("%d",array[i]);
fileOut.write(toFile.toString());
Then don't write a new line after each item, but a space. I.e. don't use writeln() or println(), but just write() or print().
Maybe code snippets are more valuable, so here is a basic example:
for (int i : array) {
out.print(i + " ");
}
Edit: if you don't want trailing spaces for some reasons, here's another approach:
for (int i = 0; i < array.length;) {
out.print(array[i]);
if (++i < array.length) {
out.print(" ");
}
}
Ok, I know Tom already provided an accepted answer - but this is another way of doing it (I think it looks better, but that's maybe just me):
int[] content = new int[4] {1, 2, 3, 4};
StringBuilder toFile = new StringBuilder();
for(int chunk : content) {
toFile.append(chunk).append(" ");
}
fileOut.write(toFile.toString().trim());
"Pseudocode"
for( int i = 0 ; i < array.lenght ; i++ )
{
if( i + 1 != array.lenght )
{
// Not last element
out.write( i + " " );
}
else
{
// Last element
out.write( i );
}
}
