Making sure text written to file when window closes

Hello,
I built an application, and I have the action set for the frame to close out my BufferedWriter stream when the application is being closed down. However, I want to make sure that things are written to the file just in case the application crashes and I have to close it out with task manager.
I'm not fully acquainted with the java.io packages for file handling...just surface.
Thank you very much,
Lior

If something is going to crash then, by definition, you are not in control of the situation. But Java applications don't crash, do they?
You might like to look at java.lang.Runtime.addShutdownHook(Thread t);

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