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Thread: Paragraph count using scanner

  1. #1
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    Default Paragraph count using scanner

    Hello,
    I'm trying to build a program that counts the number of paragraphs from a text file.I tried to use a scanner but when i run the program it returns me 0.
    I would appreciate any help...

    Here is my code:
    import java.io.BufferedReader;
    import java.io.DataInputStream;
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.util.Scanner;
     
    import javax.swing.JFileChooser;
     
     
    public class ParaCount {
     
    	public static void main(String[] args) {
     
     
    		JFileChooser chooseFile = new JFileChooser();
    		if (chooseFile.showOpenDialog(null)==JFileChooser.APPROVE_OPTION){
    			File selectedFile = chooseFile.getSelectedFile();
    			  Scanner sc=null;
    	    try
    	    {
    	        FileInputStream file = new FileInputStream(selectedFile);
    	        DataInputStream dis = new DataInputStream(file);
    	        BufferedReader br = new BufferedReader(new InputStreamReader(dis));
    	        sc = new Scanner(selectedFile);
     
    	       String str="";
    	       int paraCount = 0;
     
     
    	        while (sc.hasNextLine()){
    	            str = sc.nextLine();
    	            if (str.contains("\n") ){
    	                   paraCount++;
    	               }
    	            }
     	       System.out.println("Number of paragrahs:"+paraCount);
    	    } 
    	    catch(IOException e1){
    	        System.out.println(e1);   
    	    }
    	    }
    	}
    	}


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Paragraph count using scanner

    Can you define what a paragraph is and how you recognize one so it can be counted?

    The newline character is used by the nextLine() to determine where the end of a line is. The newline character is not returned by the nextLine() method.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Paragraph count using scanner

    Quote Originally Posted by Norm View Post
    Can you define what a paragraph is and how you recognize one so it can be counted?

    The newline character is used by the nextLine() to determine where the end of a line is. The newline character is not returned by the nextLine() method.
    I'm not sure if a .txt document recognizes paragraphs so I arbitrarily define a paragraph as an empty space between two Strings.
    e.g.

    This is the first paragraph. This is the
    first paragraph.

    This is the second paragraph. This is the
    second paragraph.

    I realize that the problem is at the method nextLine().Is there a method that returns newline character?If not how else could I define a paragraph?

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: Paragraph count using scanner

    Scanner also uses spaces to delimit what it reads. You will not be able to see the spaces or newline characters using Scanner. You need to use a class and methods that reads the bytes of the file so you can detect the spaces and newline characters.
    If you don't understand my answer, don't ignore it, ask a question.

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

    javajo32 (September 9th, 2012)

  6. #5
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    Default Re: Paragraph count using scanner

    I finally used FileInputStream and the read() method recognizes newlines.

    Thank you very much!

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