A program can use exceptions to indicate that an error occurred. To throw an exception, use the
throw statement and provide it with an exception object — a descendant of
Throwable — to provide information about the specific error that occurred. A method that throws an uncaught, checked exception must include a
throws clause in its declaration.
A program can catch exceptions by using a combination of the
tryblock identifies a block of code in which an exception can occur.
catchblock identifies a block of code, known as an exception handler, that can handle a particular type of exception.
finallyblock identifies a block of code that is guaranteed to execute, and is the right place to close files, recover resources, and otherwise clean up after the code enclosed in the
try statement should contain at least one
catch block or a
finally block and may have multiple
The class of the exception object indicates the type of exception thrown. The exception object can contain further information about the error, including an error message. With exception chaining, an exception can point to the exception that caused it, which can in turn point to the exception that caused it, and so on.