Download e-book for iPad: Active Java: Object-Oriented Programming for the World Wide by Adam Freeman, Darrel Ince

By Adam Freeman, Darrel Ince

ISBN-10: 0201403706

ISBN-13: 9780201403701

Covers the most rules at the back of the language and offers an intensive creation to new innovations and matters linked to utilizing Java. Illustrated all through with examples. Paper.

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Additional resources for Active Java: Object-Oriented Programming for the World Wide Web

Example text

Which version of add does the first extract refer to: the one defined in IntSet or the one defined in SummableSet? Similarly which version of remove does the second extract refer to: the one defined in IntSet or the one defined in SummableSet? Well, the rule that we have given previously states that when a method M is invoked associated with a class C, then method M is searched for in C, and if it is there then it is invoked; if it isn’t there then the search continues in the next class that it inherits from, namely the class in the next level in the inheritance hierarchy.

Public void addItem(String itemName) { ... } public void addCost(String itemName, int itemCost) { ... } public void addNumber(String itemName, int no) { ... } public int calculateTotalCost() { ... } } where a selection of the possible methods are shown. invoicedCompanyName is a method which returns the name of the company that is to be invoiced, setInvoicedCompanyName adds the name of the company to be invoiced to the instance variable invoicedCompany, addItem adds an item which is to be invoiced, addCost sets the cost of an item, addNumber sets the number ordered of an item and, finally, calculateTotalCost calculates the total cost of an invoice.

Such a class would normally have as its instance variables the name of the member of staff, their department, their sex, their annual pay and some indication of a tax coding which determined how much income tax would be deducted from their pay. In order to see how a hierarchy of employee records might be built up using inheritance we shall first assume that the company that wishes to use this general employee record has two types of employee: weekly paid employees and monthly paid employees. The former are paid on the basis of the number of hours worked: normally a weekly paid employee would work 40 hours per week, but the company we are considering sometimes asks its hourly paid staff to work evenings and pays them at an increased rate.

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Active Java: Object-Oriented Programming for the World Wide Web by Adam Freeman, Darrel Ince

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