What is the difference between catch and finally in exception handling

Also, is there a way to access the exception from the finally clause? Improve this question. Vijay Kotari Vijay Kotari 1, 2 2 gold badges 14 14 silver badges 16 16 bronze badges. Add a comment. Active Oldest Votes. These are two different things: The catch block is only executed if an exception is thrown in the try block.

The finally block is executed always after the try -catch block, if an exception is thrown or not. Improve this answer. Andrew 15k 9 9 gold badges 87 87 silver badges 97 97 bronze badges. A corollary to that is that you can't access the Throwable from the finally block, because there might not be a Throwable.

Michiel Buddingh Michiel Buddingh 5, 19 19 silver badges 32 32 bronze badges. Finally and catch blocks are quite different: Within the catch block you can respond to the thrown exception. Ta01 TheMorph TheMorph 2 2 silver badges 10 10 bronze badges. Kieran Kieran 16k 6 6 gold badges 42 42 silver badges 51 51 bronze badges. Fenton k 63 63 gold badges silver badges bronze badges. Android Tutorial Android Tutorial 1 1 gold badge 7 7 silver badges 19 19 bronze badges.

Hari krishna Hari krishna 1, 1 1 gold badge 10 10 silver badges 29 29 bronze badges. File; import java. FileReader; import java. Sign up or log in Sign up using Google.

Sign up using Facebook. Sign up using Email and Password. A statement with the Await operator suspends execution of the method until the awaited task completes. The task represents ongoing work. When the task that's associated with the Await operator finishes, execution resumes in the same method. For more information, see Control Flow in Async Programs.

A task returned by an Async method may end in a faulted state, indicating that it completed due to an unhandled exception.

A task may also end in a canceled state, which results in an OperationCanceledException being thrown out of the await expression. To catch either type of exception, place the Await expression that's associated with the task in a Try block, and catch the exception in the Catch block.

An example is provided later in this topic. A task can be in a faulted state because multiple exceptions were responsible for its faulting. For example, the task might be the result of a call to Task. When you await such a task, the caught exception is only one of the exceptions, and you can't predict which exception will be caught. An Await expression can't be inside a Catch block or Finally block. An iterator function or Get accessor performs a custom iteration over a collection.

An iterator uses a Yield statement to return each element of the collection one at a time. You call an iterator function by using a For Each Next Statement. A Yield statement can be inside a Try block. A Try block that contains a Yield statement can have Catch blocks, and can have a Finally block.

A Yield statement cannot be inside a Catch block or a Finally block. If the For Each body outside of the iterator function throws an exception, a Catch block in the iterator function is not executed, but a Finally block in the iterator function is executed. A Catch block inside an iterator function catches only exceptions that occur inside the iterator function.

In partial-trust situations, such as an application hosted on a network share, Try Finally does not catch security exceptions that occur before the method that contains the call is invoked. The following example, when you put it on a server share and run from there, produces the error "System.

SecurityException: Request Failed. In such a partial-trust situation, you have to put the Process. Start statement in a separate Sub. The initial call to the Sub will fail. This enables Try Catch to catch it before the Sub that contains Process. Start is started and the security exception produced. The following example illustrates the structure of the Try Finally statement.

The code that generates the exception is not in a Try block. Therefore, the CreateException method does not handle the exception. The RunSample method does handle the exception because the call to the CreateException method is in a Try block.

The example includes Catch statements for several types of exceptions, ordered from the most specific to the most general. The following example shows how to use a Catch When statement to filter on a conditional expression. If the conditional expression evaluates to True , the code in the Catch block runs. The following example has a Try…Catch statement that is contained in a Try block. The inner Catch block throws an exception that has its InnerException property set to the original exception.

The outer Catch block reports its own exception and the inner exception. The following example illustrates exception handling for async methods. To catch an exception that applies to an async task, the Await expression is in a Try block of the caller, and the exception is caught in the Catch block.

Uncomment the Throw New Exception line in the example to demonstrate exception handling. The exception is caught in the Catch block, the task's IsFaulted property is set to True , and the task's Exception. InnerException property is set to the exception. Uncomment the Throw New OperationCancelledException line to demonstrate what happens when you cancel an asynchronous process.

If a method calls another method that throws checked exceptions, the calling method is forced to either pass the exception on, or catch it. Catching the exception is done using a try-catch block. The BadNumberException parameter e inside the catch-clause points to the exception thrown from the divide method, if an exception is thrown. If no exeception is thrown by any of the methods called or statements executed inside the try-block, the catch-block is simply ignored.

It will not be executed. If an exception is thrown inside the try-block, for instance from the divide method, the program flow of the calling method, callDivide, is interrupted just like the program flow inside divide. The program flow resumes at a catch-block in the call stack that can catch the thrown exception.

In the example above the "System. If an exception is thrown inside the catch-block and that exception is not caught, the catch-block is interrupted just like the try-block would have been.

When the catch block is finished the program continues with any statements following the catch block. You don't have to catch exceptions thrown from other methods. If you cannot do anything about the exception where the method throwing it is called, you can just let the method propagate the exception up the call stack to the method that called this method. If you do so the method calling the method that throws the exception must also declare to throw the exception.

Here is how the callDivide method would look in that case. Notice how the try-catch block is gone, and the callDivide method now declares that it can throw a BadNumberException. The program execution is still interrupted if an exception is thrown from the divide method.

Thus the "System. But now the program execution is not resumed inside the callDivide method. The exception is propagated to the method that calls callDivide. Program execution doesn't resume until a catch-block somewhere in the call stack catches the exception. All methods in the call stack between the method throwing the exception and the method catching it have their execution stopped at the point in the code where the exception is thrown or propagated.

If an exception is thrown during a sequence of statements inside a try-catch block, the sequence of statements is interrupted and the flow of control will skip directly to the catch-block. This code can be interrupted by exceptions in several places:. If the reader. Neither is the last reader.

If the new FileReader "someFile" ; constructor call throws an exception, none of the code inside the try-block is executed. This code is a version of the previous method that throws the exceptions instead of catching them:. If an exception is thrown from the reader. If the calling method has a try-catch block, the exception will be caught there.

If the calling method also just throws the method on, the calling method is also interrupted at the openFile method call, and the exception passed on up the call stack. The exception is propagated up the call stack like this until some method catches the exception, or the Java Virtual Machine does. You can attach a finally-clause to a try-catch block.