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How to check write permissions of a directory in java?

I would like a code snippet that checks whether a directory has read/write permissions and do something if it does, and does something else if it doesnt. I tried an example shown here: The problem is the exception is always triggered, so it always ends up printing “Bad” regardless of whether the d…

Auto code completion on Eclipse

I want Eclipse to automatically suggest to me all possible options, while I’m writing some variable/class name or keyword, like in Flash Develop or Visual Studio. Is it possible? If not, with which Java IDE can I get this? I’m specifically asking about a way to automatically get the same thing I g…

Tracking “hidden” exceptions

I am inspecting the output of a program of mine where from time to time I see a message like “java.lang.NullPointerException” and nothing else. Because this doesn’t come from my code, I am pretty sure, there is some 3rd party library, where some jerk has done something like: catch ( ex ) { p…

Stuck implementing Wikipedia’s A* (“A star”) algorithm

I’m implementing the A* search algorithm from this pseudo on wikipedia’s article: I’m stuck on the line where I’m asked to retrive the node in openSet with the lowest f value. When has openSet been filled? With what? Should it just have start on the first run? I also don’t undest…

How to create a file in a directory in java?

If I want to create a file in C:/a/b/test.txt, can I do something like: Also, I want to use FileOutputStream to create the file. So how would I do it? For some reason the file doesn’t get created in the right directory. Answer The best way to do it is:

Java – Forward Slash Escape Character

Can anybody tell me how I use a forward slash escape character in Java. I know backward slash is but I’ve tried / and / / with no luck! Here is my code:- Thanks in advance! Answer You don’t need to escape forward slashes either in Java as a language or in regular expressions. Also note that