finally clause

**jean28** · January 21st, 2013, 01:14 AM

Hey guys, I have a few doubts about the finally clause in exception handling.

What exactly does it do? Does it need to have try and catch blocks before it in order to work?

I just can't seem to understand the use of it or a good example.

Thanks a lot.

**helloworld922** · January 21st, 2013, 01:28 AM

Finally is generally used for clean-up code you want to run irregardless of if an exception is thrown or not, for example closing IO streams. You do need a try block, but you don't need any catch clauses to have a finally block (this allows exceptions to propagate while still running cleanup code).

void readFile(BufferedReader reader) throws IOException
{
	try
	{
		// read data
	}
	finally
	{
		System.out.println("done reading data");
		reader.close();
	}
}

**jean28** · January 21st, 2013, 02:30 AM

What about that variable "reader" ? What can I do with it?

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