Computer-science students study hashing schemes in courses called “Data Structures” and “Algorithms.” Class HashMap enables you to use hashing without having to implement hash-table mechanisms—a classic example of reuse. This concept is profoundly important in our study of object-oriented programming. As discussed in earlier chapters, classes encapsulate and hide complexity (i.e., implementation details) and offer user-friendly interfaces. Properly crafting classes to exhibit such behavior is one of the most valued skills in the field of object-oriented programming. Figure ...
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