Java How to Program, Early Objects, 11th Edition

11.12 try-with-Resources: Automatic Resource Deallocation

Typically resource-release code should be placed in a finally block to ensure that a resource is released, regardless of whether there were exceptions when the resource was used in the corresponding try block. An alternative notation—the try-with-resources statement—simplifies writing code in which you obtain one or more resources, use them in a try block and release them in a corresponding finally block. For example, a file-processing application could process a file with a try-with-resources statement to ensure that the file is closed properly when it’s no longer needed—we demonstrate this in Chapter 15. Each resource must be an object of a class that implements the AutoCloseable interface ...