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Thread: Java .split not working?

  1. #1
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    Default Java .split not working?

    First of all, hello! I am new here, and I come with a very newbish question. For some reason, this decided not to work, and I spent a couple of hours trying to realize why, and I just can't manage to.
    Here is the code:
    import java.io.BufferedReader;
    import java.io.FileReader;
    import java.io.IOException;
    import java.util.ArrayList;
     
    public class Learn {
     
    	public static void readFile(String file) {
    		String[] arr;
    		BufferedReader br = null;
    		ArrayList<String> str = new ArrayList<String>();
    		try {
    			String currentLine;
    			br = new BufferedReader (new FileReader(file));
    			while((currentLine = br.readLine()) != null) {
    				if(currentLine.contains(".")) {
    					arr = currentLine.split(".");
    					System.out.println(arr.length);
    					for(int i = 0; i < arr.length; i++) {
    						System.out.println(arr[i]);
    						if(!(arr[i].equals("")))
    							str.add(arr[i]);
    					}
    				}
    				for(String st : str) {
    					System.out.println(st);
    				}
    			}
    		}
    		catch(IOException e) {
    			e.printStackTrace();
    		}
    		finally {
    			try {
    				if( br != null )
    					br.close();
    			}
    			catch(IOException e) {
    				e.printStackTrace();
    			}
    		}
    	}
    }

    and the file it is reading is
    This is a test for sentences. This sentence is one.
    This is another
    The curentLine.contains(".") expression evaluates to true, but the code stops there (I mean, just skips the rest). I added that println there, and the output is 0; so basically, something goes wrong in the split().
    Any help is greatly appreciated!
    Thank you for your time!
    Best regards,
    BrreaKer
    Last edited by BrreaKer; March 15th, 2014 at 09:02 AM. Reason: Solved


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Java .split not working?

    The . is a regex special character. Add the escape character: \ to use it as a character. There will need to be two \\s because \ is also a compiler special character.
    If you don't understand my answer, don't ignore it, ask a question.

  3. The Following 2 Users Say Thank You to Norm For This Useful Post:

    BrreaKer (March 15th, 2014), Zavael (April 7th, 2014)

  4. #3
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    Default Re: Java .split not working?

    See String (Java Platform SE 7 ) for the API of the split method, and Pattern (Java Platform SE 7 ) for regular expression constructs as well as the use of backslashes.

    An alternative to using the split method is to use String's indexOf and substring methods.

  5. The Following User Says Thank You to jashburn For This Useful Post:

    BrreaKer (March 15th, 2014)

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    Default Re: Java .split not working?

    Thank you! I totally forgot about regex!

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