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Extra resources for Data Structures and Algorithms in Java (5th Edition)

Example text

5. Note that the CreditCard class defines five instance variables, all of which are private to the class, and it provides a simple constructor that initializes these instance variables. It also defines five accessor methods that provide access to the current values of these instance variables. Of course, we could have alternatively defined the instance variables as being public, which would have made the accessor methods moot. The disadvantage with this direct approach, however, is that it allows users to modify an object's instance variables directly, whereas in many cases such as this, we prefer to restrict the modification of instance variables to special update methods.

1. For instance, it might be helpful to cast an int to a double in order to perform operations like division. Ordinary Casting When casting from a double to an int, we may lose precision. This means that the resulting double value will be rounded down. But we can cast an int to a double without this worry. 0 Casting with Operators Certain binary operators, like division, will have different results depending on the variable types they are used with. We must take care to make sure operations per­ form their computations on values of the intended type.

NextTypeO: Return the next token in the input stream, returned as the base type corresponding to Type; generate an error if there are no more tokens left or if the next token cannot be interpreted as a base type corresponding to Type. Additionally, Scanner objects can process' input line by line, ignoring delim­ iters, and even look for patterns within lines while doing so. The methods for processing input in this way include the following: hasNextLineO: Returns true if and only if the input stream has another line of text.

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