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text files

17 replies on 2 pages. Most recent reply: Nov 7, 2002 3:13 AM by ben

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Flat View: This topic has 17 replies on 2 pages [ 1 2 | » ]

ben

Posts: 57
Nickname: loftty
Registered: Oct, 2002

text files

Posted: Oct 23, 2002 9:57 AM

hello is it possible that you could help me?

im trying to read in a text file which is no problem but i also want a comma to work as a delimeter but when i do this it will only read in the first line of text but i want the whole file to read in and be delimeted
can you help me please ?
thanks for your time ben

Ramu

Posts: 29
Nickname: sripoorna
Registered: Oct, 2002

Re: text files

Posted: Oct 23, 2002 8:06 PM

hi
they are two ways to do that

1st way:
private void test1()
{
try
{
FileInputStream fis = new FileInputStream("c:\\test.txt");
InputStreamReader isr = new InputStreamReader(fis);
BufferedReader br = new BufferedReader(isr);

String str;
while((str = br.readLine()) != null)
System.out.println(str);

}
catch(Exception e)
{
System.out.println("excepton ...."+e);
}
}

2nd way:

private void test()
{
try
{
RandomAccessFile ras = new RandomAccessFile("c:\\test1.txt", "r");
String str;
while((str = ras.readLine()) != null)
System.out.println(str);
}
catch(Exception e)
{
System.out.println("excepton ...."+e);
}
}

ben

Posts: 57
Nickname: loftty
Registered: Oct, 2002

Re: text files

Posted: Oct 24, 2002 3:02 AM

hello ramu
thanks for yr time but does it delimeter the file do i still need to put in a string tokenizer and put that though a loop?

Ramu

Posts: 29
Nickname: sripoorna
Registered: Oct, 2002

Re: text files

Posted: Oct 24, 2002 3:45 AM

hi,
in that case use StreamTokenizer.
In this one also we have to read token by token and we have to check whether the token is sting or int etc..

for more u refer to the java.io.StreamTokenizer API

bye
yours
ramu

ben

Posts: 57
Nickname: loftty
Registered: Oct, 2002

Re: text files

Posted: Oct 24, 2002 9:40 AM

hello ramu
this is the source code can you put me right where im going wrong please.
what i want is the file work.txt to be read in the get delimeted but it only reads in one line (the first line) and i want it to read in all of the lines i know i need a loop in there to loop though each line where should it go if you could adjust my code so it will do that i would be most gratefull thankyou ben

import java.io.*;
import java.util.*;
import java.lang.*;
import java.util.StringTokenizer.*;

public class ReadThis {

public static void main(String[] args) {
try {
FileReader file = new FileReader("Work.txt");
BufferedReader br = new BufferedReader(file);
StringTokenizer st = new StringTokenizer(br.readLine(), ",");
String line = br.readLine();
boolean eof = false;

while ((!eof)&(st.hasMoreTokens())){
String s = st.nextToken();

if (line == null){

eof = true;
}
else

System.out.println(s);

}
br.close();
}catch (FileNotFoundException fe) {
System.out.println("Error - - " + fe.toString());
} catch (IOException e) {
System.out.println("Error - - " + e.toString());

}
}
}

Ramu

Posts: 29
Nickname: sripoorna
Registered: Oct, 2002

Re: text files

Posted: Oct 24, 2002 7:17 PM

hi

the problem in u program is u readling only one line.
in the while loop u r not reading the next line.
and one more suggestion is u divide u r program into two loops one loop for reading the line one for used stringtokenizing.

i had modified u r code and use it

import java.io.*;
import java.util.*;
import java.lang.*;
import java.util.StringTokenizer.*;

public class ReadThis
{

public static void main(String[] args)
{
try
{
FileReader file = new FileReader("work.txt");
BufferedReader br = new BufferedReader(file);

String str_Temp = br.readLine();
StringTokenizer stoken = null;

while(str_Temp != null)
{
stoken = new StringTokenizer(str_Temp, ",");

while(stoken.hasMoreTokens())
{
String str_Temp1 = stoken.nextToken();
System.out.println(str_Temp1);
}
str_Temp = br.readLine();
}
/* StringTokenizer st = new StringTokenizer(br.readLine(), ",");
String line = br.readLine();
boolean eof = false;

while ((!eof)&(st.hasMoreTokens()))
{
String s = st.nextToken();
if (line == null)
{
eof = true;
}
else
System.out.println(s);
}
*/
br.close();
}
catch (FileNotFoundException fe)
{
System.out.println("Error - - " + fe.toString());
}
catch (IOException e)
{
System.out.println("Error - - " + e.toString());
}
}
}

ben

Posts: 57
Nickname: loftty
Registered: Oct, 2002

Re: text files

Posted: Oct 25, 2002 1:14 AM

thankyou very much Ramu it works excellent i appriciate your time thanks again
ben
p.s.
I will come and pester you again sometime (lol)
cheers mate..

ben

Posts: 57
Nickname: loftty
Registered: Oct, 2002

Re: text files

Posted: Oct 29, 2002 2:14 AM

hello again Ramu
i have another problem
i want the file to be read in but i only want the first word of each line to be read in. i was going to put it in a string array, would this be a good way of doing it if so could u let me know
thanks ben

ben

Posts: 57
Nickname: loftty
Registered: Oct, 2002

Re: text files

Posted: Oct 29, 2002 4:00 AM

Ramu

Posts: 29
Nickname: sripoorna
Registered: Oct, 2002

Re: text files

Posted: Oct 29, 2002 4:21 AM

hi,

sorry for late reply. i was busy with my work.
replace the two while loops with the following single while code

while(str_Temp != null)
{
stoken = new StringTokenizer(str_Temp, ",");
String str_Temp1 = stoken.nextToken();
System.out.println(str_Temp1);
str_Temp = br.readLine();
}

regards
ramu

ben

Posts: 57
Nickname: loftty
Registered: Oct, 2002

Re: text files

Posted: Oct 30, 2002 2:02 AM

hello Ramu
thanks for the idea.
when i compile the code with the new while loop in it thows a no such element exception why is this?
ben

ben

Posts: 57
Nickname: loftty
Registered: Oct, 2002

Re: text files

Posted: Oct 30, 2002 9:50 AM

hello Ramu
could u please help me with this?
the file that i am reading in will have 10 lines of text with 10 words on each line (seperated by comar delimeters). and wat i want is the first word of each line to be put inside a hash table and then the second word of each line into the same hashtable and so on with the 3rd word 4,5,6,7,8,9,10and then at the end i want to read the hashtable out.
could u please give me any suggestions
thanks for yr time ben

ben

Posts: 57
Nickname: loftty
Registered: Oct, 2002

Re: text files

Posted: Oct 31, 2002 1:40 AM

Ramu

Posts: 29
Nickname: sripoorna
Registered: Oct, 2002

Re: text files

Posted: Nov 1, 2002 9:09 PM

hi ben,

i had compiled the text file program with the loop provided earlier.
it is working fine. it is not giving any exception.
Here i am attaching the program pls go though it.

import java.io.*;
import java.util.*;
import java.lang.*;
import java.util.StringTokenizer.*;

public class ReadThis
{
public static void main(String[] args)
{
try
{
FileReader file = new FileReader("work.txt");
BufferedReader br = new BufferedReader(file);

String str_Temp = br.readLine();
StringTokenizer stoken = null;

while(str_Temp != null)
{
stoken = new StringTokenizer(str_Temp, ",");
String str_Temp1 = stoken.nextToken();
System.out.println(str_Temp1);
str_Temp = br.readLine();
}
br.close();
}
catch (FileNotFoundException fe)
{
System.out.println("Error - - " + fe.toString());
}
catch (IOException e)
{
System.out.println("Error - - " + e.toString());
}
}
}

if any quries let me know

cheers mate
ramu

Ramu

Posts: 29
Nickname: sripoorna
Registered: Oct, 2002

Re: text files

Posted: Nov 1, 2002 9:12 PM

hi,

Basically a hastable will store a key-value pair so in u r case what about the key?

regards
ramu

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