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As you all probably know, it is not possible to call a method that throws a checked exception from a lambda directly. In some way, we need to catch the exception to make the code compile.
Most of us are aware that block lambdas are clunky and less readable. They should be avoided as much as possible, in my opinion. If we need to do more than a single line, we can extract the function body into a separate method and simply call the new method.
A better and more readable way to solve this problem is to wrap the call in a plain old method that does the try-catch and call that method from within your lambda.
This solution is at least a bit more readable and we do separate our concerns. By doing so, the method can be called inside a lambda and be used in higher order functions.
I can relate a bit to this practice because I personally do not see much value in checked exceptions in general, but that is a whole other discussion that I am not going to start here.
To avoid rewriting the same code over and over again, why not abstract it into a utility function? This way, you only have to write it once and call it every time you need it.
To do so, you first need to write your own version of the functional interface for a function. Only this time, you need to define that the function may throw an exception.
I know that we now end up with an ugly block lambda here and you could abstract the body from this. Choose for yourself if that is worth the effort for this single utility.
With a simple static import, you can now wrap the lambda that may throw an exception with your brand new utility function. From this point on, everything will work again.
The only problem left is that when an exception occurs, the processing of the your stream stops immediately. If that is no problem for you, then go for it.
I can imagine, however, that direct termination is not ideal in many situations. When working with streams, we probably don't want to stop processing the stream if an exception occurs.
If your stream contains a very large amount of items that need to be processed, do you want that stream to terminate when for instance the second item throws an exception?
Probably not. Let's turn our way of thinking around. Why not consider "the exceptional situation" just as much as a possible result as we would for a "successful" result.
Let's consider it both as data, continuing to process the stream, and decide afterward what to do with it. We can do that, but to make it possible, we need to introduce a new type — the Either type.
The Either type is a common type in functional languages and not yet part of Java. Contents Exit focus mode. IO Assembly: System. The exception that is thrown when reading is attempted past the end of a stream.
SerializableAttribute ComVisibleAttribute. Is this page helpful? Yes No. Any additional feedback? Skip Submit.
EndOfStreamException String. Inherited from Exception. Gets or sets a link to the help file associated with this exception. Gets a message that describes the current exception.
Gets or sets the name of the application or the object that causes the error. Gets a string representation of the immediate frames on the call stack.
Gets the method that throws the current exception.