Hi there
I have a directory with lot of files without any sub-folders, and i want to process in an easy was all the files in that folder. Can anyone suggest a way to do that in java. What ideally I want is a method like ls.

Thanks

Hi.

http://java.sun.com/j2se/1.5.0/docs/...a/io/File.html
says to me that File.listFiles() will return an array of all the files in a directory, e.g.Dave

Hi again and thanks for your reply.
I would like for a second time to ask what can i do for getting the current path of the folder that I compile my Java files.

Thanks

You mean your current directory?

import java.io.File;


File current = new File (System.getProperty("user.dir"));

You can test with
System.out.println(file);

It's also a good idea to build in some extra code to verify whether your app isn't erroneously pointing to a non-existent path:

if (!current.exists()){
System.out.println("Directory not found");
System.exit(1);
}

will bring the application down without any ugly error messages if it fails to locate the required directory. You could also throw a FileNotFoundException but throwing exceptions tends to kill performance so the first approach should be preferred in most cases.

Dear jay73

Thanks for your reply. I strongly believe that you can advise me on the following. Setting the case that there is a C program that can be executed with a Java Runtime command and its output in my case actually an Image, will be redirected back to the Java Program something like a scrollable Frame. Could you or anyone please recommend a way of doing that. I would also like to know if it is efficient.

Thanks

So if I understand correctly, you want your application to call native i.e. compiled C code? If so, yes, that is possible through JNI. But it's not something that I would encourage you to dabble in while you're still learning the basics. For one thing because it adds a whole new level of complexity to the extent that you also need to be familiar with the fundamentals of C coding. For another because it can have some undesired restrictions. Applets, for example, can't access C code for security reasons. And bundling your applications with platform dependent calls inevitably means that you'll break portability; you would then need to recompile (and possibly rework) your C code for every targeted operating system.

Frankly, I'd much rather write a 100% java application if all I wanted to do is load an image. I remember writing a picture viewer on one occasion that was less than 100 lines of code. Sure, it was rather primitive but more than good enough. I think you may want to have a look at Java Swing if your need to learn about GUIs, buttons, icons, text and password fields, menus, scrollbars, what not.

Java can display pictures (not all formats) itself.