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Thread: Reading from a file, multiple lines

  1. #1
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    Default Reading from a file, multiple lines

    This isn't homework, I'm only in 8th grade my school doesn't have java courses before you ask)<--
    Well I ran into a funny little problem, not quite sure how I should approach it;
    Well I have a file looking like this:
    1 0 3 2
    2 3 4 5

    And so on going down like 20 lines.
    Here is my code:
    It is meant to read the file, and to test it I had it print out the lines, but it only prints out the first line of the file.
    I know that my method readLine(); reads the first line only, how would I get it to read the next line?
    public class getNumbersFromFile
    {
    	public static void main(String[] args) {
    		getNumbersFromFile file = new getNumbersFromFile();
     	file.getFileFromMethod();
     
    	}
    	public void getFileFromMethod(){
     
    try {
     
     
    			BufferedReader FileReader = new BufferedReader(new FileReader("SudokuBoard.txt"));
    			String Text = FileReader.readLine();
     
    			String[] Split = Text.split(" ");
    			System.out.println(Text);
     
     
    			} catch (IOException e) {
    				System.out.println("Some sort of interruption.");
    				System.out.println(e);
    			}
     
    		}
    }


  2. #2
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    Default Re: Reading from a file, multiple lines

    if u want to display all lines of txt change this
    String[] Split = Text.split(" ");
    System.out.println(Text);

    to this
    String[] Split = Text.split(" ");
    int count = 0
    while ( Split[count] != null ) {
    System.out.println(Split[count]);
    count = count + 1
    }
    that should work i think
    but the main problem from what i got was that u were displaying text, not the Split array
    Programming: the art that fights back

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    Default Re: Reading from a file, multiple lines

    Quote Originally Posted by wolfgar View Post
    if u want to display all lines of txt change this
    String[] Split = Text.split(" ");
    System.out.println(Text);

    to this
    String[] Split = Text.split(" ");
    int count = 0
    while ( Split[count] != null ) {
    System.out.println(Split[count]);
    count = count + 1
    }
    that should work i think
    but the main problem from what i got was that u were displaying text, not the Split array
    I did that;
    What i get as output,then error:
    0
    0
    0
    0
    6
    0
    0
    0
    9
    Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 9
    at getNumbersFromFile.getFileFromMethod(getNumbersFro mFile.java:25)
    at getNumbersFromFile.main(getNumbersFromFile.java:10 )

  4. #4
    Super Moderator Json's Avatar
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    Default Re: Reading from a file, multiple lines

    Here is a snippet of code to read a file, line by line.

        public static void main(String[] args) throws Exception {
            final BufferedReader bufferedReader = new BufferedReader(new FileReader("SudokuBoard.txt"));
     
            if (bufferedReader != null) {
                String line;
     
               // Keep on looping while line is not null, readLine will return null when it reaches the end of the file and the loop will stop.
                while ((line = bufferedReader.readLine()) != null) {
                    System.out.println(line);
                }
     
                bufferedReader.close();
            }
     
        }

    See also
    http://www.javaprogrammingforums.com...line-file.html

    // Json

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    Thumbs up Re: Reading from a file, multiple lines

    Quote Originally Posted by Json View Post
    Here is a snippet of code to read a file, line by line.

        public static void main(String[] args) throws Exception {
            final BufferedReader bufferedReader = new BufferedReader(new FileReader("SudokuBoard.txt"));
     
            if (bufferedReader != null) {
                String line;
     
               // Keep on looping while line is not null, readLine will return null when it reaches the end of the file and the loop will stop.
                while ((line = bufferedReader.readLine()) != null) {
                    System.out.println(line);
                }
     
                bufferedReader.close();
            }
     
        }

    See also
    http://www.javaprogrammingforums.com...line-file.html

    // Json
    Jason I love you .
    It works, and I'm reading the post you linked.

  6. #6
    Super Moderator Json's Avatar
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    Default Re: Reading from a file, multiple lines

    Glad I could help

    // Json

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