File	Doc	Category	Size	Date	Package
CustomExceptionUsage.java	API Doc	Example	3068	Sun Dec 14 22:47:38 GMT 2003	oreilly.hcj.exceptions

CustomExceptionUsage

• java.lang.Object

Fields Summary
private boolean	approved Holds whether transaction is approved or not.
private boolean	validCard Holds whether the card is valid or not.

Constructors Summary

Methods Summary
public void	billCard(java.lang.String cardNumber, java.util.Date expiration, java.lang.Float amount) The poor practice of using multiple empty exception classes. param cardNumber Cutomer's card number. param expiration Expiration date of the card. param amount Amount to bill. throws BillingException If an error in the billing occurs. throws CreditCardDeclinedException If the card is declined. // verify card type and expiration ... if (!validCard) { throw new BillingException(); } // checking code ... if (!approved) { System.err.println(cardNumber + "\t" + expiration + "\t" + amount); throw new CreditCardDeclinedException(); }
public void	billCard2(java.lang.String cardNumber, java.util.Date expiration, java.lang.Float amount) Using custom exceptions with error codes. param cardNumber Cutomer's card number. param expiration Expiration date of the card. param amount Amount to bill. throws MyCustomException If there is some problem billing the card. // verify card type and expiration ... if (!validCard) { throw new MyCustomException(MyCustomException.BILLING_ERROR); } // checking code ... if (!approved) { System.err.println(cardNumber + "\t" + expiration + "\t" + amount); throw new MyCustomException(MyCustomException.CREDIT_CARD_DECLINED); }
public boolean	checkForApproval() Checks for card approval. return True if approved, false otherwise. return true;