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

By Adam Freeman, Darrel Ince

ISBN-10: 0201403706

ISBN-13: 9780201403701

Covers the most principles at the back of the language and offers a radical advent to new techniques and concerns linked to utilizing Java. Illustrated all through with examples. Paper.

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

Example text

This was a very simple example of a loop which started at 1, was incremented by 1 and stopped after a single integer value was encountered. For statements can be more complex. For example: for(int i = start+newList; i <= followBitSum; i += 2) statements; executes statements repeatedly, starting with the control variable having the value start+newList with it being incremented by two each time that it traverses the statements, finishing when i is greater than the contents of the integer variable followBitSum.

These methods carry out no actions at all but are just place holders which are filled when a subclass is formed by means of inheritance from the abstract class. In order to explain what you might think is a weird idea it is worth looking at an example of an abstract class. Class A { // Instance variables for the class // Code for method 1 // Code for method 2 // Code for method 3 abstract AbsMethod { } // Code for method n } Class A is regarded as abstract because one of its methods (AbsMethod) contains no code at all and is headed by the keyword abstract.

We might also expect the code for remove within SummableSet to look like: public void remove(int no) { remove(no); sum = sum - no; ... } There is one problem, however. 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.

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