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decode "compiled Java class data, version 52.0" text from file

I have a file without extension but I used an online site to know the type of this file. It says the file contains "compiled Java class data, version 52.0".
The content of the file that I need to read here
 ˛∫æ4)

<init>()VCodeLineNumberTablemain([Ljava/lang/String;)V
StackMapTable
SourceFileHelloWorld.java
SYNT{SBERAFVPF_101} !"#$%&'(
HelloWorldjava/lang/Objectjava/lang/Stringlength()IcharAt(I)Cjava/lang/SystemoutLjava/io/PrintStream;java/io/PrintStreamprint(C)V!
*∑±
«rL=+∂¢g+∂>a°m£
`í>ß?A°M£
`í>ß*n°z£
dí>ßN°Z£ 
dí>≤∂Ñߡó±*
I just need to make this file readable and get the output from it
What is the encoding type used or is there any online site that can read it.

It's a compiled Java class, not some text with an encoding. Compiling means translating human readable text into instructions a PC can understand. So the file contains such CPU instructions similar to machine code, called "intermediate language" or "byte code".
Use java.exe to run it and see the output. Be aware that running a program of an unknown person is dangerous. It could delete files etc.
You can't get the source code back, but you can use a Java Decompiler to get close to the original.

The comment
SourceFileHelloWorld.java
suggests this is a Java "Hello, World!" program (e.g.). The long line in the middle
HelloWorldjava/lang/Objectjava/lang/Stringlength()IcharAt(I)Cjava/lang/SystemoutLjava/io/PrintStream;java/io/PrintStreamprint(C)V!
suggests the program prints "HelloWorld." That would be the output.

Using the created document trough FPDF with PHP/JAVA

I created a PDF document with PHP using FPDF. The next thing I want to do is silently printing the document without downloading the PDF file to the computer.
I've made the following code:
$pdfprintable = $pdf->Output(''.'.pdf','S');
$printcmd = "java -classpath jPDFPrint.jar;pdfprintcli.jar cli.PDFPrintCLI $pdfprintable";
exec($printcmd);
And it returns the following error message:
Warning: exec(): NULL byte detected. Possible attack in C:\Users\Jordy\Desktop\XAMPP\htdocs\php\stickers\pdf.php on line 392
If I echo the $pdfprintable in PHP it shows a lot of weird characters.

Are you sure the java command is supposed to be used with an hexadecimal string represenation of the PDF ?
use option
$pdfprintable = $pdf->Output('USEAFULLPATHTOFILE.pdf','F');
With the above the PDF is generated and then you can try to print it with the java application if that one works.
Also if you are loading the PDF correctly in FPDF you should be able to use the option D in ->Output
$pdfprintable = $pdf->Output('USEAFULLPATHTOFILE.pdf','D');
Use this to verify the that the PDF is loaded and also managed correctly by FPDF.
Also notice your example code is very limited.
If you need more troubleshooting pls show the Java and the full PHP source relevant to printing operation, loading or creation of the PDF in FPDF

How do we build Normalized text file from DeNormalized one?

Thanks for your replies/time.
We need to build a Normalized text file from DeNormalized text file. We explored couple of options such as unix shell , and Loading into data base etc. I am looking pick up better ideas for resolutions from this community.
The input text file is various length with comma delimited records. The content may look like this:
**XXXXXXXXXX , YYYYYYYYYY, TTTTTTTTTTT, UUUUUUUUUU, RRRRRRRRR,JJJJJJJJJ
111111111111, 22222222222, 333333333333, 44444444, 5555555, 666666
EEEEEEEE,WWWWWW,QQQQQQQ,PPPPPPPP**
We like to normalize as follows:
**XXXXXXXXXX , YYYYYYYYYY
TTTTTTTTTTT, UUUUUUUUUU
RRRRRRRRR,JJJJJJJJJ
111111111111, 22222222222
333333333333, 44444444
5555555, 666666
EEEEEEEE,WWWWWW
QQQQQQQ,PPPPPPPP**
Are there any simple approach to get the above?
Thanks in helping.

Subtitile editor[.srt to .ssa]

I have been working on a subtitling system on java.
the normal .srt file can be saved and the subtitles are seen fine.
i want the subtitles to have different properties like diff font/color/size all these properties are not encoded in a normal .srt, the file has to be saved as .ssa(substation alpha) with extra fields like [v4+ style] and events..
i want to know that are there any libraries which i can use to export directly to .ssa or do i have to write a method which includes the [v4+ style]
Thank you.

jubler is an open source library that seems to support substation alpha format.

Running a JavaScript command from MATLAB to fetch a PDF file

I'm currently writing some MATLAB code to interact with my company's internal reports database. So far I can access the HTML abstract page using code which looks like this:
import com.mathworks.mde.desk.*;
wb=com.mathworks.mde.webbrowser.WebBrowser.createBrowser;
wb.setCurrentLocation(ReportURL(8:end));
pause(1);
s={};
while isempty(s)
s=char(wb.getHtmlText);
pause(.1);
end
desk=MLDesktop.getInstance;
desk.removeClient(wb);
I can extract out various bits of information from the HTML text which ends up in the variable s, however the PDF of the report is accessed via what I believe is a JavaScript command (onClick="gotoFulltext('','[Report Number]')").
Any ideas as to how I execute this JavaScript command and get the contents of the PDF file into a MATLAB variable?
(MATLAB sits on top of Java, so I believe a Java solution would work...)

I think you should take a look at the JavaScript that is being called and see what the final request to the webserver looks like.
You can do this quite easily in Firefox using the FireBug plugin.
https://addons.mozilla.org/en-US/firefox/addon/1843
Once you have found the real server request then you can just request this URL or post to this URL instead of trying to run the JavaScript.

Once you have gotten the correct URL (a la the answer from pjp), your next problem is to "get the contents of the PDF file into a MATLAB variable". Whether or not this is possible may depend on what you mean by "contents"...
If you want to get the raw data in the PDF file, I don't think there is a way currently to do this in MATLAB. The URLREAD function was the first thing I thought of to read content from a URL into a string, but it has this note in the documentation:
s = urlread('url') reads the content
at a URL into the string s. If the
server returns binary data, s will
be unreadable.
Indeed, if you try to read a PDF as in the following example, s contains some text intermingled with mostly garbage:
s = urlread('http://samplepdf.com/sample.pdf');
If you want to get the text from the PDF file, you have some options. First, you can use URLWRITE to save the contents of the URL to a file:
urlwrite('http://samplepdf.com/sample.pdf','temp.pdf');
Then you should be able to use one of two submissions on The MathWorks File Exchange to extract the text from the PDF:
Extract text from a PDF document by Dimitri Shvorob
PDF Reader by Tom Gaudette
If you simply want to view the PDF, you can just open it in Adobe Acrobat with the OPEN function:
open('temp.pdf');

wb=com.mathworks.mde.webbrowser.WebBrowser.createBrowser;
wb.executeScript('javascript:alert(''Some code from a link'')');
desk=com.mathworks.mde.desk.MLDesktop.getInstance;
desk.removeClient(wb);