How to read a text file and output on screen ?

Posted on 2001-07-03
Medium Priority
Last Modified: 2008-02-01
Below code is taken from EE's answer. It would read a text file "ReadFile.java", and output it on the screen.

When i put it as <applet>, or i run it using "java ReadFile.class", there is no output on my screen.

Is it because of any io or security issue ? how to read a text file and output it on the screen ?


import java.io.*;
public class ReadFile
    public static void main(String args[])
         throws Exception
         FileInputStream fin=new FileInputStream("ReadFile.java");
         BufferedInputStream bin=new BufferedInputStream(fin);
         String result;
         int MAX_SIZE=1024;
         byte b[]=new byte[MAX_SIZE];
         int i,count=0;
         while ( (i=bin.read()) != -1  )
              if (count >= MAX_SIZE)
         result=new String(b);
Question by:collinng
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

Accepted Solution

mzimmer74 earned 200 total points
ID: 6250142
Well, you never actually print anything to the screen.  If you want to see what you read in change the System.out.println(); statement to System.out.println(result);

Expert Comment

ID: 6250158
The only thing this program is printing out to the screen is a new line character, which comes from the final "System.out.println();", which is outside your while loop. Try substituting "System.out.println(result);".
Also is the file you are trying to read in the same directory as your class file? I'm not sure whether the FileInputStream generates a File Not Found exception if it can't find the file. You could pass it a File object rather than a String, and then you would get that exception.


Author Comment

ID: 6251105
i added the var "result", ie. System.out.println(result);

when i use an applet to run JavaRead.Class, there is no output. should i use setText and textbox ?

When i just type "java ReadFile.class" the err msg is:

Exception in thread "main" java.lang.NoClassDefFoundError: ReadFile/class.

Is there a certificate issue ? i hope not.
Thanks for any comments.



Expert Comment

ID: 6251720
 pls tell me the meaning of following
>>when i use an applet to run JavaRead.Class

r u using appletviewer
or  r u trying to run the applet from browser?
another thing is u should not suppy the extension while running the classfile
ie instead of java JavaRead.class
pls type
java JavaRead

Author Comment

ID: 6252895

To clarify:

"When i use applet to run ReadFile.class"

<applet code="ReadFile.class" width=300 height=300>

i add the above as in a html file, and open the html file using a browser.

When i type "Java ReadFile" it would output on the dos screen. Is there a tip to see the output on the browser ?


Featured Post

Get real performance insights from real users

Key features:
- Total Pages Views and Load times
- Top Pages Viewed and Load Times
- Real Time Site Page Build Performance
- Users’ Browser and Platform Performance
- Geographic User Breakdown
- And more

Question has a verified solution.

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

After being asked a question last year, I went into one of my moods where I did some research and code just for the fun and learning of it all.  Subsequently, from this journey, I put together this article on "Range Searching Using Visual Basic.NET …
Introduction This article is the last of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article covers our test design approach and then goes through a simple test case example, how …
Viewers will learn about basic arrays, how to declare them, and how to use them. Introduction and definition: Declare an array and cover the syntax of declaring them: Initialize every index in the created array: Example/Features of a basic arr…
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:
Suggested Courses
Course of the Month11 days, 14 hours left to enroll

752 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