sudokufile.java

SudokuVer1.3 Project using the JAVA Code to play sudoku Release version 1.3

// Name: Tsang Kai Ming, Patrick (25)
// Couse Code 41300/1 Group V
// Subject: ICT-1414 Object-oriented Programming
// Sudoku Assignment 2 File (Java Programming)

import java.io.*;
import java.util.StringTokenizer;

class SudokuFile {

	// A static method to read the specified file to a Sudoku object
	public static Sudoku readFile(String filename) {

		// create an empty sudoku to store the result
		Sudoku sdk = new Sudoku();

		// you need to have try...catch (or throw IOExceptin)
		// whenever you read/write a file
		try {
			// open the file using a buffered reader
			BufferedReader in = new BufferedReader (new FileReader(filename));

			// read in a line
			String line = in.readLine();

			// line counter
			int i = 0;

			// if the line is successfully read,
			while(line!=null) {

				// if more than 9 lines, the file format is wrong
				if(i>=9) throw new SudokuFileFormatException();

				// break it down using string tokenizer, cut down by " " or "|"
				StringTokenizer st = new StringTokenizer(line, " |");

				// if there are 9 tokens, (the horizontal lines will not have 9 tokens)
				if(st.countTokens()==9) {
					// we use a for loop to put in the numbers one by one
					 for (int j=0; j<9; j++) {
						 // Integer.parseInt is used to convert the String read to int
						sdk.put(Integer.parseInt(st.nextToken()), i, j);
					 }
					 i++;
				}

				// read the next line
				line = in.readLine();
			} // while loop

			// if number of rows is not 9, the file format is wrong
			if(i!=9) throw new SudokuFileFormatException();

		} catch (Exception e) {
			e.printStackTrace();
			System.out.println("Cannot read sudoku file: " + filename + ". Program aborted.");
			sdk = null;
		}

		// return the filled sudoku object
		return sdk;
	}

	// You may want to test your program by un-commenting the followings:


	// read the given s1.txt to test the files
	public static void main (String args[]) {
		System.out.println(readFile("s1.txt"));
	}

}

class SudokuFileFormatException extends IOException {
	public SudokuFileFormatException () {
		super("Your file is not in Sudoku format");
	}
}