I'm trying to read a file filled with integers like this

and put it into an array of integer.

My idea is to read the file with getLine() method (which will result a very long
string), split it with string tokenizer with space delimiter(I did not find a
method to do this automatically like StringTokenizer in Java) and covert it one
by one to integer and put it into an array.

I find this method is very exhaustive. Any best practice for this problem? Can I
read the file delimited with space instead of per line? Any tokenizer method
without doing it manually?

Call fscanf() in a loop until you are done reading all the integers. Use %d
as the format string.