Programming Forums > Application Development > Java

Dark Flare Knight · Jul 2nd, 2005, 3:15 PM

how can i search for a specif word in a txt file?

Mjordan2nd · Jul 2nd, 2005, 5:42 PM

Read it in line by line, getting one entie line as a String, and then use the contains() method from the String class on it to see if it's there or not. Or do you want something more specific?

Dark Flare Knight · Jul 2nd, 2005, 6:35 PM

(Toggle Plain Text)

String l = "Light";
f (filedata.contains (l))
            c.println ("Congratualations, your code is correct");
        else
            c.println ("Too bad, your code has bugs");

would this work? if yes, its not working.

Dark Flare Knight · Jul 2nd, 2005, 7:41 PM

I get the following error:

Quote:

No method named "contains" was found in the type "java.lang.String".

Mjordan2nd · Jul 2nd, 2005, 9:08 PM

Post your whole code. I think that should work.

Dark Flare Knight · Jul 2nd, 2005, 9:11 PM

(Toggle Plain Text)

import java.awt.*;
import java.io.*;
import hsa.Console;
public class Duel_Prac
{
    static Console c = new Console ();
    static BufferedReader file;
    static String f_name;
    static String l_name;
    static String option = "";
    static String filedata;
    static public void main (String[] args) throws IOException
    {
        startup_page ();
        main_menu ();
    }


    static void startup_page ()
    {
        c.clear ();
        c.println ("Prac");
        c.println ();
        c.println ("Before we begin, please provide us with the following information about you: ");
        c.println ();
        c.print ("First Name: ");
        f_name = c.readLine ();
        c.print ("Last Name: ");
        l_name = c.readLine ();
    }


    static void main_menu () throws IOException
    {
        c.clear ();
        c.println ("Prac");
        c.println ();
        c.println ();
        c.println ();
        c.print ("1) shop");
        do
        {
            c.setCursor (3, 1);
            c.print ("What do you want do ? ");
            option = c.readLine ();
            if (option.equals ("1") == true || option.equalsIgnoreCase ("shop") == true)
                break;
        }
        while (!option.equals ("1") && !option.equalsIgnoreCase ("shop"));
        if (option.equals ("1") == true || option.equalsIgnoreCase ("shop") == true)
            shop ();
    }


    static void shop () throws IOException
    {
        try
        {
            file = new BufferedReader (new FileReader ("Card Data/EP1-EN.masterlist"));
            while ((filedata = file.readLine ()) == null)
                break;
            file.close ();
        }
        catch (IOException e)
        {
            c.println ("Data is corrupt");
        }
        String l = "Light";
        if (filedata.contains (l))
            c.println ("Congratualations, your code is correct");
        else
            c.println ("Too bad, your code has bugs");
    }
}

xavier · Jul 2nd, 2005, 10:53 PM

(Toggle Plain Text)

try
        {
            file = new BufferedReader (new FileReader ("Card Data/EP1-EN.masterlist"));
            while ((filedata = file.readLine ()) == null)
                break;
            file.close ();
        }

The way you'r reding the file, filedata will only contain the last line, actually i don't know if it reads anything because of : == null
I think it should be like this:

(Toggle Plain Text)

String currentLine;
 file = new BufferedReader (new FileReader ("Card Data/EP1-EN.masterlist"));
            while ((currentLine = file.readLine ()) != null)
              filedata += currentLine;
            file.close ();

Dark Flare Knight · Jul 3rd, 2005, 4:43 AM

xP i sorta forgot at the time what the code was for it.

EDIT

still gives the same error

Quote:

No method named "contains" was found in the type "java.lang.String".

would it make a difference if i use equals () or equalsIngoreCase () instead of contains ().

xavier · Jul 3rd, 2005, 1:07 PM

I think that contains() is only for Java 1.5 so make sure that u have that.
The thing is i have never used contains() so i'm not sure how it works

If u're trying to find a specific word in a text, then you could do it like this :
Split the text in lines with BufferedReader, the use StringTokenizer to split the lines in words. Then you can use equalsIgnoreCase().

Google for a few examples of StringTokenizer ... and you should be done in no time.

Dark Flare Knight · Jul 3rd, 2005, 4:06 PM

I downloaded 1.5 but how do i use it?

Jul 2nd, 2005, 3:15 PM	#1
Dark Flare Knight Hobbyist Programmer Join Date: Mar 2005 Location: Canada Posts: 113 Rep Power: 4	Searching a txt file how can i search for a specif word in a txt file?

Jul 2nd, 2005, 5:42 PM	#2
Mjordan2nd The Supreme Ruler Join Date: May 2004 Location: Houston Posts: 1,476 Rep Power: 6	Read it in line by line, getting one entie line as a String, and then use the contains() method from the String class on it to see if it's there or not. Or do you want something more specific? __________________ "Every gun that is made, every warship launched, every rocket signifies, in the final sense, a theft from those who hunger and are not fed, from those who are cold and are not clothed. The world in arms is not spending money alone. It is spending the sweat of its laborers, the genius of its scientists, the hopes of its children." - Dwight D. Eisenhower

Jul 2nd, 2005, 6:35 PM	#3
Dark Flare Knight Hobbyist Programmer Join Date: Mar 2005 Location: Canada Posts: 113 Rep Power: 4	(Toggle Plain Text) String l = "Light"; f (filedata.contains (l)) c.println ("Congratualations, your code is correct"); else c.println ("Too bad, your code has bugs"); String l = "Light"; f (filedata.contains (l)) c.println ("Congratualations, your code is correct"); else c.println ("Too bad, your code has bugs"); would this work? if yes, its not working. Last edited by Dark Flare Knight; Jul 2nd, 2005 at 7:00 PM.

Jul 2nd, 2005, 9:08 PM	#5
Mjordan2nd The Supreme Ruler Join Date: May 2004 Location: Houston Posts: 1,476 Rep Power: 6	Post your whole code. I think that should work. __________________ "Every gun that is made, every warship launched, every rocket signifies, in the final sense, a theft from those who hunger and are not fed, from those who are cold and are not clothed. The world in arms is not spending money alone. It is spending the sweat of its laborers, the genius of its scientists, the hopes of its children." - Dwight D. Eisenhower

Jul 2nd, 2005, 9:11 PM	#6
Dark Flare Knight Hobbyist Programmer Join Date: Mar 2005 Location: Canada Posts: 113 Rep Power: 4	(Toggle Plain Text) import java.awt.; import java.io.; import hsa.Console; public class Duel_Prac { static Console c = new Console (); static BufferedReader file; static String f_name; static String l_name; static String option = ""; static String filedata; static public void main (String[] args) throws IOException { startup_page (); main_menu (); } static void startup_page () { c.clear (); c.println ("Prac"); c.println (); c.println ("Before we begin, please provide us with the following information about you: "); c.println (); c.print ("First Name: "); f_name = c.readLine (); c.print ("Last Name: "); l_name = c.readLine (); } static void main_menu () throws IOException { c.clear (); c.println ("Prac"); c.println (); c.println (); c.println (); c.print ("1) shop"); do { c.setCursor (3, 1); c.print ("What do you want do ? "); option = c.readLine (); if (option.equals ("1") == true \|\| option.equalsIgnoreCase ("shop") == true) break; } while (!option.equals ("1") && !option.equalsIgnoreCase ("shop")); if (option.equals ("1") == true \|\| option.equalsIgnoreCase ("shop") == true) shop (); } static void shop () throws IOException { try { file = new BufferedReader (new FileReader ("Card Data/EP1-EN.masterlist")); while ((filedata = file.readLine ()) == null) break; file.close (); } catch (IOException e) { c.println ("Data is corrupt"); } String l = "Light"; if (filedata.contains (l)) c.println ("Congratualations, your code is correct"); else c.println ("Too bad, your code has bugs"); } } import java.awt.; import java.io.; import hsa.Console; public class Duel_Prac { static Console c = new Console (); static BufferedReader file; static String f_name; static String l_name; static String option = ""; static String filedata; static public void main (String[] args) throws IOException { startup_page (); main_menu (); } static void startup_page () { c.clear (); c.println ("Prac"); c.println (); c.println ("Before we begin, please provide us with the following information about you: "); c.println (); c.print ("First Name: "); f_name = c.readLine (); c.print ("Last Name: "); l_name = c.readLine (); } static void main_menu () throws IOException { c.clear (); c.println ("Prac"); c.println (); c.println (); c.println (); c.print ("1) shop"); do { c.setCursor (3, 1); c.print ("What do you want do ? "); option = c.readLine (); if (option.equals ("1") == true \|\| option.equalsIgnoreCase ("shop") == true) break; } while (!option.equals ("1") && !option.equalsIgnoreCase ("shop")); if (option.equals ("1") == true \|\| option.equalsIgnoreCase ("shop") == true) shop (); } static void shop () throws IOException { try { file = new BufferedReader (new FileReader ("Card Data/EP1-EN.masterlist")); while ((filedata = file.readLine ()) == null) break; file.close (); } catch (IOException e) { c.println ("Data is corrupt"); } String l = "Light"; if (filedata.contains (l)) c.println ("Congratualations, your code is correct"); else c.println ("Too bad, your code has bugs"); } }

Jul 2nd, 2005, 10:53 PM	#7
xavier Professional Programmer Join Date: Oct 2004 Location: .ro Posts: 383 Rep Power: 4	(Toggle Plain Text) try { file = new BufferedReader (new FileReader ("Card Data/EP1-EN.masterlist")); while ((filedata = file.readLine ()) == null) break; file.close (); } try { file = new BufferedReader (new FileReader ("Card Data/EP1-EN.masterlist")); while ((filedata = file.readLine ()) == null) break; file.close (); } The way you'r reding the file, filedata will only contain the last line, actually i don't know if it reads anything because of : == null I think it should be like this: (Toggle Plain Text) String currentLine; file = new BufferedReader (new FileReader ("Card Data/EP1-EN.masterlist")); while ((currentLine = file.readLine ()) != null) filedata += currentLine; file.close (); String currentLine; file = new BufferedReader (new FileReader ("Card Data/EP1-EN.masterlist")); while ((currentLine = file.readLine ()) != null) filedata += currentLine; file.close (); __________________ Don't take life too seriously, it's not permanent !

Jul 3rd, 2005, 1:07 PM	#9
xavier Professional Programmer Join Date: Oct 2004 Location: .ro Posts: 383 Rep Power: 4	I think that contains() is only for Java 1.5 so make sure that u have that. The thing is i have never used contains() so i'm not sure how it works If u're trying to find a specific word in a text, then you could do it like this : Split the text in lines with BufferedReader, the use StringTokenizer to split the lines in words. Then you can use equalsIgnoreCase(). Google for a few examples of StringTokenizer ... and you should be done in no time. __________________ Don't take life too seriously, it's not permanent !

Jul 3rd, 2005, 4:06 PM	#10
Dark Flare Knight Hobbyist Programmer Join Date: Mar 2005 Location: Canada Posts: 113 Rep Power: 4	I downloaded 1.5 but how do i use it?

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Programming Forums > Application Development > Java

Searching a txt file