{"id":87435,"date":"2019-02-08T13:27:21","date_gmt":"2019-02-08T11:27:21","guid":{"rendered":"http:\/\/www.javacodegeeks.com\/?page_id=87435"},"modified":"2023-03-06T16:04:29","modified_gmt":"2023-03-06T14:04:29","slug":"java-exception-handling-tutorials","status":"publish","type":"page","link":"https:\/\/www.javacodegeeks.com\/java-exception-handling-tutorials","title":{"rendered":"Java Exception Handling Tutorials"},"content":{"rendered":"

\"Java<\/a><\/p>\n

In this detailed Resource page, we feature an abundance of AWT Tutorials<\/strong>!<\/p>\n

Exception handling<\/a> is the process of responding to the occurrence, during computation, of exceptions \u2013 anomalous or exceptional conditions requiring special processing \u2013 often changing the normal flow of program execution. It is provided by specialized programming language constructs, computer hardware mechanisms like interrupts or operating system IPC facilities like signals.<\/p>\n

In general, an exception breaks the normal flow of execution and executes a pre-registered exception handler. The details of how this is done depends on whether it is a hardware or software exception and how the software exception is implemented. Some exceptions, especially hardware ones, may be handled so gracefully that execution can resume where it was interrupted.<\/p>\n

Alternative approaches to exception handling in software are error checking, which maintains normal program flow with later explicit checks for contingencies reported using special return values or some auxiliary global variable such as C’s errno or floating point status flags; or input validation to preemptively filter exceptional cases.<\/p>\n

Software exception handling and the support provided by software tools differs somewhat from what is understood by exception handling in hardware, but similar concepts are involved. In programming language mechanisms for exception handling, the term exception is typically used in a specific sense to denote a data structure storing information about an exceptional condition. One mechanism to transfer control, or raise an exception, is known as a throw. The exception is said to be thrown. Execution is transferred to a “catch”.<\/p>\n

From the point of view of the author of a routine, raising an exception is a useful way to signal that a routine could not execute normally – for example, when an input argument is invalid (e.g. value is outside of the domain of a function) or when a resource it relies on is unavailable (like a missing file, a hard disk error, or out-of-memory errors). In systems without exceptions, routines would need to return some special error code. However, this is sometimes complicated by the semipredicate problem, in which users of the routine need to write extra code to distinguish normal return values from erroneous ones.<\/p>\n

Programming languages differ substantially in their notion of what an exception is. Contemporary languages can roughly be divided into two groups:<\/p>\n