A program can use exceptions to indicate that an error occurred. To throw an exception, use thethrow
statement and provide it with an exception object a descendant ofThrowable
to provide information about the specific error that occurred. A method that throws an uncaught, checked exception must include athrows
clause in its declaration.A program can catch exceptions by using a combination of the
try
,catch
, andfinally
blocks.The
- The
try
block identifies a block of code in which an exception can occur.- The
catch
block identifies a block of code, known as an exception handler, that can handle a particular type of exception.- The
finally
block 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 thetry
block.try
statement should contain at least onecatch
block or afinally
block and may have multiplecatch
blocks.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.