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

By William J. Collins

Rather than emphasizing the underlying arithmetic to get programmers to construct their very own facts buildings, Collins permits them to control latest constructions within the Java Collections Library. this permits them to benefit via coding instead of by means of doing proofs. 23 lab initiatives and enormous quantities of programming examples are built-in during the pages to construct their instinct. The process this ebook takes is helping programmers speedy examine the thoughts that underlie information constructions.

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Method toString } // class FullTimeEmployee In the two-parameter constructor, one of the parameters is name. The reserved word this is used to distinguish between the scope of the field identifier name and the scope of the parameter name. name refers to the name field of the calling object, and name by itself refers to the parameter name. grossPay refers to the calling object’s grossPay field, and grossPay by itself refers to the parameter grossPay. In the other methods, such as toString(), there is no grossPay parameter.

The underlying concept is known as the Open-Closed Principle: Every class should be both open (extendible through inheritance) and closed (stable for existing applications). Instead of rewriting FullTimeEmployee, we will create HourlyEmployee, a subclass of FullTimeEmployee. To indicate that a class is a subclass of another class, the subclass identifier is immediately followed by the reserved word extends. For example, we can declare the HourlyEmployee class to be a subclass of FullTimeEmployee as follows: public class HourlyEmployee extends FullTimeEmployee { ...

3 shows the relationship between the argument s and the parameter t at the start of the execution of the call to the flip method. 4 shows the relationship between s and t at the end of the execution of the method call. 4 The relationship between the argument s and the parameter t at the end of the execution of the flip method in the class Immutable Some built-in classes are mutable. For example, the following program illustrates the mutability of Scanner objects. next() was called in the advance method, and that call advanced the current position of the Scanner object (referenced by both sc and scanner) beyond where “no” is.

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