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public class ExcessiveSpeedException extends Exception { ExcessiveSpeedException( Automobile a ) { super( "New speed exceeds maximum speed of " + a.toString() ); } } Our ExcessiveSpeedException inherits from Exception. The ExcessiveSpeedException constructor expects an Automobile object as an argument. To take advantage of the message attribute inherited from the superior class, it incorporates the toString() description of the Automobile into the message that it passes to the constructor of the superior Exception class. Now we can rewrite the accelerate() method of Automobile as follows: public void accelerate ( double newSpeed ) throws ExcessiveSpeedException { if( newSpeed > 70. ) throw new ExcessiveSpeedException( this ); speed = newSpeed; } The reference to this means that the particular instance of Automobile that generates the ExcessiveSpeedException will be passed to the ExcessiveSpeedException constructor. Notice that the method header for accelerate() now includes a declaration that the method can throw an ExcessiveSpeedException. If you forget to include the declaration, the compiler will require such a declaration when it sees that some statement within the method throws an ExcessiveSpeedException. Finally, notice that we no longer require an else clause after the if statement. Once a method throws an exception, execution stops, except for whatever code is ready to catch the Exception. Therefore, we no longer need else to insure two non-overlapping paths of execution in response to the test in the if statement. We can rewrite the AutomobileFactory class to handle the possible occurrence of an ExcessiveSpeedException. . . . try { family.accelerate( 120. ); sports.accelerate( 120. ); } catch( ExcessiveSpeedException ex) { System.out.println( ex.getMessage() ); } System.out.println( family + " " + family.getSpeed() ); System.out.println( sports + " " + sports.getSpeed() ); } In this case, the catch block simply reports the error, and the program continues on. With other errors, the catch block might try to correct the problem, ask the user for a decision, or simply terminate the program by calling System.exit(). The output from this version of AutomobileFactory looks like this: 3 Automobiles 2006 Kia Rio 2002 VW Passat 2005 Ford Mustang New speed exceeds maximum speed of 2002 VW Passat 2002 VW Passat 0.0 2005 Ford Mustang 0.0
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When AutomobileFactory tries to accelerate the VW to too great a speed, the Automobile class throws an ExcessiveSpeedException which stops execution of accelerate() and transfers control to the catch block. The catch block reports the problem by printing the message attribute of the Exception object. When the catch block completes, the program continues, but the speeds of both Automobiles remain 0.0, because the path of execution never set the speed of either one. There can be more than one catch block; in fact, you can have several. Each one can specify a particular class of Exception to handle. That is important to segregating code for handling different kinds of problems. If a method throws a FileNotFoundException, it may be easy to fix by asking the operator to enter the file name again. On the other hand, if a read of the file fails and the method throws an IOException, it may be difficult for the program to recover. In the first case the catch block may soldier on, and in the second case the catch block may simply report the error and then call System.exit(). When more than one catch block follows a try block, the catch blocks should be ordered such that lowerlevel Exception classes occur before higher-level, more general classes of Exceptions. When a method throws an exception, the try block searches down the list of catch blocks until it finds a match between the Exception class that was thrown and the Exception class declared in the catch block. The first acceptable match will be invoked to handle the error. If the first catch block specifies objects of class Exception, the most general class, the first catch block will handle all Exceptions, regardless of whatever other catch blocks there may be. So, if a program wants to attempt to recover from a FileNotFoundException and terminate on any other failure, the catch block for the FileNotFoundException should come before the catch block for the class Exception. There s one more option. After the try block and all the catch blocks, a programmer can add a finally block. A finally block contains code that will always be executed, whether an error occurs or not. A finally block is a good place to put general clean-up code, like the statement to close a data base. Here is the syntax for the try/catch/finally construction: try { . . //main line logic goes here . } catch( SpecificException ex ) { . . //handle SpecificException . } catch( LessSpecificException ex ) { . . //handle LessSpecificException . } catch( Exception ex ) { . . //handle everything else that might happen . } finally { . . //tidy up this code will always be executed . } //If code is successful, or exception is caught and // handled, execution will continue here.
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