Why finally c

Alternatively, you can catch the exception that might be thrown in the try block of a try - finally statement higher up the call stack. That is, you can catch the exception in the method that calls the method that contains the try - finally statement, or in the method that calls that method, or in any method in the call stack.

If the exception is not caught, execution of the finally block depends on whether the operating system chooses to trigger an exception unwind operation. In the following example, an invalid conversion statement causes a System. InvalidCastException exception. The exception is unhandled. In the following example, an exception from the TryCast method is caught in a method farther up the call stack.

For more information about finally , see try-catch-finally. Hide TOC. Note: If the JVM exits while the try or catch code is being executed, then the finally block may not execute.

Likewise, if the thread executing the try or catch code is interrupted or killed, the finally block may not execute even though the application as a whole continues. Important: The finally block is a key tool for preventing resource leaks. WriteLine strReader. ReadeToEnd ; StreamReader. WriteLine ex. Ariven Nadar Ariven Nadar 1, 11 11 silver badges 13 13 bronze badges. Chris Doggett Chris Doggett If the exception is not caught, execution of the finally block depends on whether the operating system chooses to trigger an exception unwind operation.

Beska Beska First Code] [2. Try] [3. Catch] [4. Finally] [5. Ranald Fong Ranald Fong 7 7 bronze badges. As mentioned in the documentation : A common usage of catch and finally together is to obtain and use resources in a try block, deal with exceptional circumstances in a catch block, and release the resources in the finally block. It is also worth reading this , which states: Once a matching catch clause is found, the system prepares to transfer control to the first statement of the catch clause.

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Post as a guest Name. Email Required, but never shown. The Overflow Blog. Does ES6 make JavaScript frameworks obsolete? Podcast Do polyglots have an edge when it comes to mastering programming Featured on Meta. Now live: A fully responsive profile. The execution of a finally block is intended to release resources , such as database connections, which are usually available in limited quantities. The code inside a finally block will get executed regardless of whether or not there is an exception.

The "finally" block is very useful in various situations, particularly when you need to perform cleanup dispose resources , though a using block is often better in this case. One important thing to remember is, a finally block MUST NOT throw an exception unless the system design explicitly wants you to do so, which is considered bad practice in general.