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Thread: Not Reading From Text File

  1. #1
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    Default Not Reading From Text File

    I am making a program for my Java class it is supposed to give suggestions for jumbles and my Professor wants me to do it this way but for some reason tester1 and tester2 are reading null right off the bat in the first two while loops. Please help!:

    package mysort;
    import java.util.Arrays;
    import java.io.BufferedReader;
    import java.io.FileReader;
    import java.io.IOException;
    public class Sorting {
     
    	public static void main (String [] args) throws IOException
    	{
     
    		int i=0;
    		int n=0;
    		int t=0;
    		int r=0;
    		int p=0;
    		int y=0;
    		int q=0;
    		BufferedReader ldj = null;
    		BufferedReader ldc = null;
    		ldj = new BufferedReader(new FileReader("small_j.txt"));
    		ldc = new BufferedReader(new FileReader("small_d.txt"));
    		String tester1;
    		String tester2;
    		tester1 = "1";
    		tester2 = "1";
    		int jl=0;
    		int dl=0;
    		while ((tester1=ldj.readLine()) !=null);
    		{
    			jl++;
    		}
    		while ((tester2=ldc.readLine()) !=null);
    		{
    			dl++;
    		}
    		ldj.close();
    		ldc.close();
    		BufferedReader brj = null;
    		BufferedReader brd = null;
    		brj = new BufferedReader(new FileReader("small_j.txt"));
    		brd = new BufferedReader(new FileReader("small_d.txt"));
    		String [] jumbles = new String [jl];
    		String [] dictionary = new String [dl];
     
    		for (t=0;t<jl;t++) 
    		{
    			jumbles [t] =brj.readLine();
    		}
    		for (y=0;y<dl;y++)
    		{
    			dictionary [y] = brd.readLine();
    		}
    		String dictionary_copy[]=Arrays.copyOf(dictionary,dl);
    		String [] jumble_copy = Arrays.copyOf(jumbles, jl);
    		for(n=0;n<dl;n++)
    		{
    			dictionary_copy[n]=sortElement(dictionary_copy[n]);
    		}
     
    		for(p=0;p<jl;p++)
    		{
    			jumbles[p] = sortElement(jumbles[p]);
    		}
     
    		for(q=0;q<jl;q++)
    		{
    			r = 0;
    			System.out.println(jumble_copy[q]+" possible matches:");
    			for(r=0;r<dl;r++)
    			{
    				if(jumbles[q]==dictionary_copy[r])
    				{
    					System.out.println(dictionary[r]);
    				}
    			}
    		}
     
     
     
    	}
    	public static String sortElement(String d)
    	{
    		int b=0;
    		int n=d.length();
    		char [] l = d.toCharArray();
    		Arrays.sort(l);
    		d="";
    		for (b=0;b<n;b++)
    		{
    			d=d+l[b];
    		}
    		return d;
    	}
    }
    Last edited by JavaLaxer15; March 18th, 2012 at 09:56 AM.


  2. #2
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    Default Re: Not Reading From Text File

    When ever I get these sorts of problems I first check the following:

    -Do the files exist ?
    -Have I got the right case/spelling for the file names?
    -Do the files have the correct data in them?
    -Is the extension correct in the program (e.g .txt)?
    -Are the files in the right location on your system?


    **Another issue could be the IDE that you're using - are you using one btw?

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