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Programmers build into their programs exception handlers designed to react to runtime errors An exception handler is a portion of the program that contains statements that execute automatically whenever a specific run-time error occurs while the program runs Including an exception handler in a program is referred to as exception handling Not all computer languages support exception handling Therefore, programmers are left to their own vices to handle run-time errors, usually by testing conditions that might generate a run-time error For example, a programmer is likely to test whether an instructor input a valid entry (for example, zero number of students sitting for the
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CHAPTER 9 Exception Handling
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test) before processing the input The program traps an invalid entry before the entry causes the run-time error A lot of conditions need to be tested for in a typical program, which makes this approach to exception handling complex and cumbersome for many programs to enact Fortunately, Java supports exception handling, enabling a programmer to avoid having to identify conditions that have the potential of causing run-time errors and having to devise and code a test to catch errors before an error impacts the operation of the program
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Certain statements within a program are susceptible to causing a run-time error These statements typically depend on a source outside of the control of the program, such as input from the person using the program or processing that could generate a run-time error Rather than test input received from outside sources and from processing, programmers tell Java to monitor those statements and then throw an exception if a runtime error occurs Programmers provide Java with statements that are to be executed if an exception is thrown This is referred to as catching an exception Statements that you want monitored by Java must appear within a try block A try block consists of the keyword try followed by opening and closing braces, which define the block itself Statements appearing within the opening and closing braces are monitored by Java for exceptions Statements that are executed when an exception is thrown by Java are placed within a catch block A catch block consists of the keyword catch followed by opening and closing braces Statements within the opening and closing braces are executed when an exception is thrown A catch block responds to one kind of exception, which is specified within the catch block s parentheses Multiple catch blocks are used to respond to multiple exceptions Every try block must have at least one catch block or a finally block The catch block must appear immediately following its corresponding try block Failure to pair them causes a compiler error Let s see how the try and catch blocks are used in a program The following example uses a try block to monitor statements in the main() method These statements declare and initialize variables and then perform division Notice that the value of variable b is zero and that variable b is used as the divider in the division expression, which generates a run-time error
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At the end of the try block is a catch block The catch block is said to catch an ArithmeticException that is represented by the variable e Think of ArithmeticException as a type of exception and the variable e as the specific exception within this exception type Exceptions of the ArithmeticException variety are errors in arithmetic Therefore, catch catches arithmetic errors Code that is being monitored by the try block generates an arithmetic error when it tries to divide by zero When Java detects this error, it throws a divide by zero exception and assigns it to variable e The content of variable e is then used by the statement within the body of the catch block to display the exception on the screen The following message is displayed on the screen when you run this program:
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Error: javalangArithmeticException: / by zero class Demo { public static void main (String args[]) { try { int a = 10, b = 0, c; c = a/b; } catch (ArithmeticException e) { Systemoutprintln("Error: " + e); } } }
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