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Message
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AS Filipowski
Registered
29/02/2004
Points
444
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29th March, 2006 at 17:37:38 -
Basically, im trying to read string from a file and parse it, but I keep getting a 'NullPointerException' error in lines 28 and 38. Can someone help me? It's due in tommorow and I don't know how to solve it.
"import java.io.*;
public class Assignment
{
static String inString; String currentstr; char character = ' ';
public static void main(String args[]) throws IOException
{
String filename = "Manchester.txt";
String words[] = new String[50];
int lines;
FileReader inStream = new FileReader(filename);
BufferedReader inFile = new BufferedReader(inStream);
inString = inFile.readLine();
int counter = 0;
while (inString != null)
{
inString=inFile.readLine( );
words[counter]=inString;
counter++;
}
inFile.close( );
lines = counter;
counter = 0;
while (counter<lines)
{
counter++;
Compare(words[counter]);
}
//System.out.println(words[1]); // Test to see if string copying works
}
public static void Compare(String words)
{
int counter2=0;
char character = ' ';
character = words.charAt(0);
return;
}
}"
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David Newton (DavidN)
Invisible
Registered
27/10/2002
Points
8322
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29th March, 2006 at 19:02:08 -
NullPointerException exceptions don't exactly go out of their way to help you, as there's never an indication of what exactly caused it - to compensate, System.out.println the variables you're comparing first (in this case the contents at that point in the array). I can see you did try this, but it's in the wrong place - it should be done before Compare is called, not after.
http://www.davidn.co.nr - Games, music, living in America
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AS Filipowski
Registered
29/02/2004
Points
444
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29th March, 2006 at 20:34:32 -
Ok, i'll try that. Thanks
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mushi-games
Registered
17/02/2005
Points
136
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30th March, 2006 at 01:49:33 -
Your loop is wrong, you are reading 2 lines before you save it to the array, so..
// get rid of first read and
while((inString = inFile.readLine()) != null)
{
// Stuff
}
or save to array in the loop BEFORE reading next line.
-peace
He did harken unto her, "hark hark," harkened he.
http://www.freepgs.com/mushi/
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