reading only certain lines from a .txt file

**straw** · March 7th, 2010, 07:37 AM

Hi i have this code that reads a this txt file below.

My code:

try {
    BufferedReader in = new BufferedReader(new FileReader("file.txt"));
    String str;
    while ((str = in.readLine()) != null) {
        System.out.println(str);
    }
    in.close();
} catch (IOException e) {
}

The File.txt:

Ollie
1
2
3
----
Fred
1
2
3
----

I would like to edit the code so that it would be more like:

str.equals("Ollie")
System.out.println(1);
System.out.println(2);
System.out.println(3);

i know thats not how you code it but just trying to show that it only reads the 3 lines below the name if the name equals "Ollie"

Thanks in advance
Ollie =]

**helloworld922** · March 7th, 2010, 03:08 PM

If there's any data you don't want printed out, don't. Just keep reading until you find what you want.

BufferedReader reader = new BufferedReader(new FileReader("file.txt"));
 
while (reader.hasNext())
{
     if (reader.nextLine().equals("Ollie"))
     {
          // prints out the three lines following the name Ollie
          System.out.println(reader.nextLine());
          System.out.println(reader.nextLine());
          System.out.println(reader.nextLine());
     }
}

**straw** · March 7th, 2010, 04:34 PM

hi thanks for the response, i tried using the reader.hasNext() but it just comes up with this error:

cannot find symbol
symbol: method hasNext()
location: class java.io.BufferedReader

i have imported:

import java.io.*;
import java.io.BufferedReader;
import java.io.FileReader;

but none of them seem to fix it, what is the problem?

Thanks in advance
Ollie =]

**helloworld922** · March 7th, 2010, 06:37 PM

Oops... my bad. I used the methods from the Scanner class

note: you will need to either surround this code with a try/catch block, or add a throws declaration to your method.

Scanner reader = new Scanner(new File("file.txt"));
 
while (reader.hasNext())
{
     if (reader.nextLine().equals("Ollie"))
     {
          // prints out the three lines following the name Ollie
          System.out.println(reader.nextLine());
          System.out.println(reader.nextLine());
          System.out.println(reader.nextLine());
     }
}

**straw** · March 7th, 2010, 07:49 PM

haha its ok just glad i have this it looks alot easier than what i have been doing!! XD

yer thats what i have been doing for the BufferedReader aswell but thanks for the heads up!

Thanks helloworld!! =]

EDIT: for anyone else looking at this to make it work you need to:

import java.util.Scanner;

(add it at the very top of the code outside the class)

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