The try-with-resources Statement The Java Tutorials > Essential Java Classes > Exceptions

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Fields that are declared but not initialized will be set to a reasonable default by the compiler. Generally speaking, this default will be zero or null, depending on the data type. Relying on such default values, however, is generally considered bad programming style.

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Consequently, subclasses of the AutoCloseable interface can override this behavior of the close method to throw specialized exceptions, such as IOException, or no exception at all. In this example, the resources declared in the try-with-resources statement are a FileReader and a BufferedReader. The declaration statements of these resources appear within parentheses immediately after the try keyword. The classes FileReader and BufferedReader, in Java SE 7 and later, implement the interface java.lang.AutoCloseable.

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