| Summary: |
Exceptions (named from the term 'exceptional event') are event that occur during the execution of a program that interrupt the flow of the programs normal operation, i.e. when a serious problem occurs, the program will throw an exception. Throwing an exception creates an exception object which is handed over to the runtime system. Exception objects details the type of error, location and state of the program. Runtime system attempts to handle exception by looking in the call stack and searching through the ordered list of methods invoked prior to exception the being thrown in order to get to the method where the error occurs. The is achieved by sreaching the methods for a block of code that can handle the exception, known as the exception handler. When the appropriate exception handler has been found and object is passed to the exception handling block. |
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