?
Solved

readLine() and DataInputStream vs BufferedReader

Posted on 1998-08-10
2
Medium Priority
?
2,324 Views
Last Modified: 2012-06-22
I'm reading "Java Network Programming" by Hughes, Schoffner and Winslow (good book).
The book was written 1.0 - not a mention about readLine() deprecation.
Question is do I simply use BufferedReader.readLine() wherever I see
DataInputStream.readLine()?  Is this a no brainer or is there something
to watch out for in network communications that makes this a "maybe"?

Thanks
Thanks
0
Comment
Question by:hank1
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 3

Accepted Solution

by:
sailwind earned 200 total points
ID: 1232323
In short, yes you can simply use the BufferedReader.readln() to
read in data.

You can use InputStreamReader to read in data, the readln()
will work just fine. In JDK 1.1, we can add additional filters to the
input stream to enhance its capabilities. BufferedReader, for example
will allow you to buffer the incoming bits. This allows for fewer read
operations from the source, and improves the efficiency.

Therefore, to read from the standard input, the following two lines will
be what you want:

BufferedReader in = new BufferedReader(new InputStreamReader(System.in))
String s = in.readLine();

As you can see, inputStreamReader could've done the job of reading the data.
However, piping it through the buffered reader adds more efficiency to it.

For a even more involved example of chaining multiple filters, try this program out:

import java.io.*;

      class Lines {
         static String fileName = "test.in";
         public static void main(String[] args) {
            try {
               FileInputStream in = new FileInputStream(fileName);
               LineNumberInputStream lineIn;
               lineIn = new LineNumberInputStream(in);
               DataInputStream dataIn = new DataInputStream(lineIn);

               while (dataIn.available() > 0) {
                  String s = dataIn.readLine();
                  int lineNum = lineIn.getLineNumber();
                  System.out.println("Line " + lineNum + ": " + s);
               }
            } catch (IOException x) {
               System.out.println(x.getMessage());
            }
         }
      }

Take a look, I'm sure you'll see how it works. If not, just post a message and I'll
explain.
0
 
LVL 1

Author Comment

by:hank1
ID: 1232324
Thanks
0

Featured Post

What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

Question has a verified solution.

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

For beginner Java programmers or at least those new to the Eclipse IDE, the following tutorial will show some (four) ways in which you can import your Java projects to your Eclipse workbench. Introduction While learning Java can be done with…
This was posted to the Netbeans forum a Feb, 2010 and I also sent it to Verisign. Who didn't help much in my struggles to get my application signed. ------------------------- Start The idea here is to target your cell phones with the correct…
Viewers will learn about the regular for loop in Java and how to use it. Definition: Break the for loop down into 3 parts: Syntax when using for loops: Example using a for loop:
How to fix incompatible JVM issue while installing Eclipse While installing Eclipse in windows, got one error like above and unable to proceed with the installation. This video describes how to successfully install Eclipse. How to solve incompa…
Suggested Courses
Course of the Month9 days, 13 hours left to enroll

762 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