William J. Collins's Data Structures and the Java Collections Frameworks PDF

By William J. Collins

ISBN-10: 0470482672

ISBN-13: 9780470482674

Rather than emphasizing the underlying arithmetic to get programmers to construct their very own information buildings, Collins allows them to govern latest constructions within the Java Collections Library. this permits them to benefit via coding instead of through doing proofs. 23 lab initiatives and enormous quantities of programming examples are built-in during the pages to construct their instinct. The technique this e-book takes is helping programmers quick examine the innovations that underlie info buildings.

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Example text

We could simply scrap the existing class and develop our own, but that would be time consuming and inefficient. Another option is to copy the needed parts of the existing class and incorporate those parts into a new class that we develop. The danger with that option is that those parts may be incorrect or inefficient. If the developer of the original class replaces the incorrect or inefficient code, our class would still be erroneous or inefficient. 3. 3 Inheritance We should write program components that are reusable.

When we work with the List interface or the LinkedList method specifications, we are taking a user’s view. But when we consider a specific choice of fields and method definitions in LinkedList, we are taking a developer’s view. In Chapter 0, we viewed the String class from the user’s perspective: what information about the String class is needed by users of that class? A user of a class writes code that includes an instance of that class. Someone who simply executes a program that includes an instance of a class is called an end-user.

Another option is to copy the needed parts of the existing class and incorporate those parts into a new class that we develop. The danger with that option is that those parts may be incorrect or inefficient. If the developer of the original class replaces the incorrect or inefficient code, our class would still be erroneous or inefficient. 3. 3 Inheritance We should write program components that are reusable. For example, instead of defining a method that calculates the average gross pay of 10 employees, we would achieve wider applicability by defining a method that calculates the average gross pay of any number of employees.

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Data Structures and the Java Collections Frameworks by William J. Collins


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