Read file and count rows and columns

Question

Can someone guide me on how can I accomplish the following
a) read what supposedly is a matrix from text file
b) make sure all the entries in input are integers
c) if not raise error, else
c) is the matrix a square matrix?
d) if not raise error if its not square matrix else
e) if it's a square matrix, print the matrix on the screen
please give me pointers.. some code snippet is ok. but would like to code to some degree myself. so i can grasp how java works.
thanks

Answer 1

javadonkey wrote:
how do I verify if all the lines consist of ints. Well, there are two parts here. One is to split the line into tokens, and the other is to try to parse each of those tokens as an int. There are two ways you could do this:
1) String.split() and Integer.parseInt(). See the javadocs for details of those methods.
2) Use java.util.Scanner. Again, see its javadocs, and you may also want to look at a java io tutorial, like this one: [http://java.sun.com/docs/books/tutorial/essential/io/]
and if its a square matrixCan you define in English what makes a square matrix?