Solved

open a file

Posted on 1998-07-22
3
202 Views
Last Modified: 2010-03-30
how do you open a file in java when given a filename and directory information?
0
Comment
Question by:javalearner
  • 2
3 Comments
 

Accepted Solution

by:
bjornh earned 50 total points
ID: 1227633
Try this to read and print a text file. Dont forget to define variables dir and filename.

try
{
    BufferedReader in = new BufferedReader(new FileReader(dir + filename));
    String s;
    while ((s = in.readLine()) != null)
    {      // Do something with s
    }
    in.close();
} catch(IOException e)
{      // Something went wrong, print error message
}
0
 

Author Comment

by:javalearner
ID: 1227634
i have four methods in my class:  open(), read(), write(), and close().
i just want to have a file open first.  whether to read or write from the file will be determined later, and the actual reading and writing is not done in open().
is this all i need to open a file:
        BufferedReader in = new BufferedReader(new FileReader(dir + filename));
       
should the rest be in my read() method?
       String s;
        while ((s = in.readLine()) != null)
        { // Do something with s
        }
        in.close();
    } catch(IOException e)
    { // Something went wrong, print error message
    }

thanks.
0
 

Expert Comment

by:bjornh
ID: 1227635
I think that should do if you make sure your read method has access to the in-variable, so you have to define it in your class.

This will only work for your read method because you opened your file for reading.

There are lots of other possibilities. I use the book CoreJava, it's quite good though expensive.

Good luck, Bjorn
0

Featured Post

What is SQL Server and how does it work?

The purpose of this paper is to provide you background on SQL Server. It’s your self-study guide for learning fundamentals. It includes both the history of SQL and its technical basics. Concepts and definitions will form the solid foundation of your future DBA expertise.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Apps blocked by Java 9 79
oracle 11g 23 81
web application structure 18 77
jboss wildfly 10.1 10 89
Go is an acronym of golang, is a programming language developed Google in 2007. Go is a new language that is mostly in the C family, with significant input from Pascal/Modula/Oberon family. Hence Go arisen as low-level language with fast compilation…
In this post we will learn how to connect and configure Android Device (Smartphone etc.) with Android Studio. After that we will run a simple Hello World Program.
Viewers learn about the third conditional statement “else if” and use it in an example program. Then additional information about conditional statements is provided, covering the topic thoroughly. Viewers learn about the third conditional statement …
This tutorial covers a step-by-step guide to install VisualVM launcher in eclipse.

770 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question