Putting try catch finally block inside another finally block

Question

 try {  } catch() {}  finally {      try {      } catch() { }      finally { }  } 

Is it good to have the code like above?

Answer 1

Yes, you can do this.

Actually, you are even required to do it when dealing with streams you want to close properly:

InputStream in = /* ... */; try { } catch (...) { } finally {     try {         in.close();     } catch (...) {     } finally {     } } 

I don't see any case in which this would be a bad practice

Answer 2

For readability you can factor out the nested try-catch in to a separate method, like:

  try{   }catch(){}   finally{     cleanup();   } 

And the second try-catch can be inside the cleanup method.

To support the above pattern in IO package, JAVA6 introduces a new class called Closeable that all streams implement, so that you can have a single cleanup method as follows:

public static boolean cleanup(Closeable stream) { try{     stream.close();     return true;   }catch(){     return false;   } }