finally keyword and auto variables

[Pojahn_M]

First question, is finally keyword useless? I know what it does but I can not think of any use for it.
Example, we could write like this:

try
{
	FileReader fil = new FileReader("C:\\hello.txt");
	BufferedReader fi = new BufferedReader (fil);
	//Code
}
catch
{
	//Code
}
finally
{
	fi.close ();
}

But we could also write like this:

FileReader fil;
BufferedReader fi;
try
{
	fil = new FileReader("C:\\hello.txt");
	fi = new BufferedReader (fil);
	//Code
}
catch
{
	//Code
}
fi.close ();

I prefer the second way.
So, is it useless? And is there an other way to use keyword finally without it being related to try-catch?

Second, am I the only one who want auto keyword in Java? I think it could be useful.

[JosAH]

First question, is finally keyword useless? I know what it does but I can not think of any use for it.
Example, we could write like this:

try
{
	FileReader fil = new FileReader("C:\\hello.txt");
	BufferedReader fi = new BufferedReader (fil);
	//Code
}
catch
{
	//Code
}
finally
{
	fi.close ();
}

But we could also write like this:

FileReader fil;
BufferedReader fi;
try
{
	fil = new FileReader("C:\\hello.txt");
	fi = new BufferedReader (fil);
	//Code
}
catch
{
	//Code
}
fi.close ();

I prefer the second way.
So, is it useless? And is there an other way to use keyword finally without it being related to try-catch?

Second, am I the only one who want auto keyword in Java? I think it could be useful.

But what would your code do if it doesn't catch a certain Exception type? The part of your code following the catch clause(s) won't be reached and you won't be able to close your resource(s) or do any other cleanup work ...

The 'auto' keyword (as in C) is a relic; local variables are 'auto' by themselves.

kind regards,

Jos

[Tolls]

In the second case, if an exception is thrown, how will the file reader stream (fil) be closed?

[Tolls]

Oh, and why would auto be any use at all in Java?

[Tolls]

...and why did I not notice that Jos had already replied?

[Pojahn_M]

But what would your code do if it doesn't catch a certain Exception type? The part of your code following the catch clause(s) won't be reached and you won't be able to close your resource(s) or do any other cleanup work ...

The 'auto' keyword (as in C) is a relic; local variables are 'auto' by themselves.

kind regards,

Jos

I am not catching your point. Can you write a simple code that explain how its useful?

[sunde887]

public void someMethod(){
  BufferedReader br = ...;
  try{
    do something that can throw exceptions
  } catch(NumberFormatException nfe){
    nfe.printStackTrace();
  }
  close reader outside finally
}

If an exception is thrown how does the file get closed?

[JosAH]

...and why did I not notice that Jos had already replied?

Invisible ink.

kind regards,

Jos