Difference between try-finally and try-catch

Question

What\'s the difference between

try {
    fooBar();
} finally {
    barFoo();
}

and

try {
  fooBar();
} catch(Throwable thro         


        

Answer 1

Finally and catch blocks are quite different:

• Within the catch block you can respond to the thrown exception. This block is executed only if there is an unhandled exception and the type matches the one or is subclass of the one specified in the catch block's parameter.
• Finally will be always executed after try and catch blocks whether there is an exception raised or not.

---

So

try {
  //some code
}
catch (ExceptionA) {
  // Only gets executed if ExceptionA 
  // was thrown in try block
}
catch (ExceptionB) {
  // Only executed if ExceptionB was thrown in try 
  // and not handled by first catch block
}

differs from

try {
  //some code
}
finally {
  // Gets executed whether or not 
  // an exception was thrown in try block
}

significantly.

If you define a try block you have to define

1. one finally block, or
2. one or more catch blocks, or
3. one or more catch blocks and one finally block

So the following code would be valid too:

try {
  //some code
}
catch (ExceptionA) {
  // Only gets executed if 
  // ExceptionA was thrown in try block
}
catch (ExceptionB) {
  // Only executed if ExceptionB was thrown in 
  // try and not handled by first catch block
}
//even more catch blocks
finally {
  // Gets executed whether or not an 
  // exception was thrown in try block
}