Data Structures and the Java Collections Framework (3rd - download pdf or read online

By William Collins

Providing scholars and teachers a pragmatic method of application layout, checking out and implementation, this article makes use of the Java Collections Framework, a part of the java.util package deal, as a platform to enhance higher-level purposes. This up-to-date 3rd version beneficial properties an elevated emphasis on trying out. The unit checking out beneficial properties of JUnit4 ? with the test-first version ? are brought early, in bankruptcy 2, and built-in in functions in the course of the ultimate chapters. furthermore, there's considerable chance for hands-on perform, together with 23 lab experiments, hundreds of thousands of programming workouts and greater than 30 programming tasks.

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Additional info for Data Structures and the Java Collections Framework (3rd Edition)

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2 Classes 11 The scope of an identifier is the region of a program to which that identifier’s declaration applies. In the isPrime method, the scope of the parameter n is the entire function definition, but the scope of the variable j is only the for statement. A compile-time error results if an attempt is made to access an identifier outside of its scope: for example, if we tried to print out the value of j outside of the for statement in the isPrime method. This restriction of identifiers to specific code segments—and not, for example, to an entire method—promotes modularity.

The run method calls a findBestPaid method to return the best-paid full-time employee, or null if there were no employees scanned in. Finally, the findBestPaid method invokes a getNextEmployee method to handle the details of constructing a FullTimeEmployee instance from a name and a gross pay. run(); } // method main /** * Determines and prints out the best paid of the full-time employees * scanned in from a specified file. toString()); } // method run /** * Returns the best paid of all the full-time employees scanned in.

A developer of a class, on the other hand, focuses on the class’s fields and method definitions, that is, how the class is defined. This separation—called data abstraction —of what from how is an essential feature of object-oriented programming. For example, programmers who use the String class will not care about the fields that represent a string or how the methods are defined. Such details would be of no help when you are trying to develop a class that uses the String class, but were essential to the developers of the String class.

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Data Structures and the Java Collections Framework (3rd Edition) by William Collins

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