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Working with Classes and Their Relationships
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3 A is the correct answer. Since there are no arrays or collections involved with either the Client object or Address object, this must be one-to-one.
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B and C are incorrect. 14. In the preceding code segment, what is the multiplicity between the Client object and the accountNums variable A. One-to-one B. One-to-many C. Many-to-many Answer:
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3 B . The array of AccountNum objects should be a giveaway that this is one-to-many.
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and C are incorrect. A 15. Which of the following statements are true (Choose all that apply.) A. Association navigation can be quad-directional. B. Association navigation can be bidirectional. C. Association navigation can have no direction. D. Association navigation can be unidirectional. Answer:
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3 a B nd D. A relationship can only be unidirectional or bidirectional.
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and C are incorrect. A
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Understanding Class Inheritance
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CERTIFICATION OBJECTIVES
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I nheritance and Class Type E ncapsulation
Two-Minute Drill
Q&A Self Test
dvanced Examples of Classes with A Inheritance and Encapsulation
7:
Understanding Class Inheritance
CERTIFICATION OBJECTIVE
Inheritance and Class Type
Exam Objective 1.2 Describe, compare, and contrast concrete classes, abstract classes, and interfaces, and how inheritance applies to them. Inheritance is a fundamental concept of the Java language. It allows specific classes to inherit the methods and instance variables of more general classes. This creates code that is maintainable and emphasizes code reuse. The SCJA exam will require a thorough understanding of these topics. This section will also examine the differences between concrete classes and abstract classes. Concrete classes are the standard class, but abstract classes are tied to inheritance. The SCJA exam will surely have a few questions where it will be important to understand what type of class is being used. Finally, interfaces will be discussed. In short, an interface allows the developer to specify an external public interface to a class. Any class that implements or uses this interface must abide by the specifications the interface outlines. This section is about inheritance and the details of how inheritance works. This concept will not only be a major part of the SCJA exam, but is also a very important concept to understand as a developer. The following topics will be covered over the next few pages:
n Inheritance n Overriding methods n Abstract classes n Interfaces n Advanced concepts of inheritance
Inheritance
Inheritance allows a developer to create general classes that can then be used as the foundation for multiple specific classes. For example, a program may be required to have classes that represent animals. The animals that must be represented are dogs, cats, and horses. All of these animal classes share some common elements. In this simple example, each animal would have a weight, age, and color instance variable.
Inheritance and Class Type
Each animal class would also have methods that allow it to do such things as eat, rest, and move. These methods could be called eat(), rest(), and move(int direction). This can be implemented without inheritance by creating a class for each animal type and then defining each of the previously mentioned methods. This implementation approach will work but has a few drawbacks. Since each type of animal eats, rests, and moves very similarly, there will be a lot of duplicated code between each class. Duplicated code makes a program hard to maintain. If a bug is found in one class, the developer must remember to go find it in every other class that has a copy of that code. The same problem exists for adding features to the duplicated code. It becomes very easy for code that should perform the same to slowly start performing differently as the code goes through the development and maintenance process. Another disadvantage of this approach is that polymorphism cannot be used. Polymorphism is a technique that allows a specific object, like a dog object, to be referred to in code as its more general parent animal. Polymorphism will be covered in detail in 8. Since this approach does not use inheritance, polymorphism is not possible. The following is an example of each animal class implemented in this approach. The details of the class are represented as comments to explain what functionality would be present if implemented.
public class Dog1 { int weight; int age; String hairColor; public void eat(){ /* Eat food by chewing */ } public void rest(){ /* Rest */ } public void move(int direction) { /* Walk in the direction given as a parameter */ } public void bark() { /* Bark */ } } public class Cat1 { int weight; int age; String hairColor; public void eat(){ /* Eat food by chewing */ }
7:
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