Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Describe how to make use of wrapper classes for non-object data types in order to prevent the accidental mixing of object and non-object values?
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- The question is how to safeguard class fields against accidental modification.arrow_forwardPolymorphism: Why is it needed especially from an OOP standpoint? What is the essential concept when you cast objects regarding Polymorphism/Inheritance? (Related Chapters 11,12,13, 19) Generics: Explain Generic Programming. Why is generics important as a data type regarding objects? Polymorphism and Objects: Explain an array of polymorphic objects in a single/double dimensional array. How do you access this? How do you process this? When would you use this? Also, when the new topic/chapter is posted regarding File/IO: Write a few lines of code that allow you to save/retrieve this data from a file using the appropriate class/methods. Do this in two ways: StreamFile I/O and URL access. You can also illustrate this in your code via text (.txt) and binary (.dat) data access. Also, write a few more additional lines of code illustrating StreamFile I/O access for .txt and .bin files.arrow_forwardProgrammers establish classes to maintain a separation between an implementation's function and the data it uses. This directly enables functions and classes to operate on any data type. a false approach would be a file with header information. An illustration of a generic class design format.arrow_forward
- Please provide three advantages of employing accessors rather than making secret types public.arrow_forwardSo, what are "static members" of a class, exactly? To what extent and when may you benefit from them?arrow_forward6.b.Fast in java coding please. Thank you 1. Abstract classes and interfaces can both be used to model common features.How do you decide whether to use an interface or a class?2. What is Garbage Collection and how can you mark an object for GarbageCollection.arrow_forward
- How can class fields be protected against unintended alteration is the question.arrow_forwardObject passing checklist1. Go over each member function and add the const keyword after their declaration ifthey do not modify any of the class' member variables.2. When accepting objects as parameters, prefer to pass them by reference. Add reference declarator (& before the identifier name of an object parameter.3. If the member function does not modify the parameter, make the parameter constantby using the const keyword. apply the Object Passing Checklist. Modify food.h and volunteer.h to useobject references. Add const and & keywords in the appropriate places of the code.arrow_forwardExplain how to use wrapper classes for non-object data types so that you don't end up with a jumbled bag of non-object and object values?arrow_forward
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