how to generate barcode in vb.net 2008 B . The extends keyword is used to inherit a class. in Java

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3 B . The extends keyword is used to inherit a class.
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and C are incorrect. A is incorrect because inherits is not a valid Java keyword. C is A incorrect because the implements keyword is used for interfaces, not classes. 12. How many classes can a class extend directly A. Zero B. One C. Two D. As many as it needs
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3 B . A class can only extend one other class. However, it is possible to have one class extend a class that extends another class, and so on.
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A, C, nd D are incorrect. a 13. How many interfaces can a class implement directly A. Zero B. One C. Two D. As many as it needs Answer:
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3 D . Unlike extending other classes, a class can implement as many interfaces as it needs.
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A, B,and C are incorrect. 14. Consider the following UML illustration for assistance with this question:
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What is the proper signature for class A if it implements interfaces B and C A. public class A implements B, implements C{ } B. public class A implements B, C{ } C. public class A interface B, interface C{ } D. public class A interface B, C{ } E. public class A extends B, C{ } Answer:
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3 A B. class uses the keyword implements to implement an interface. To implement multiple interfaces, they are shown in a comma-delimited list after the keyword implements.
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7:
Understanding Class Inheritance
A, C, D,and E are incorrect. A is incorrect because the implements keyword should not be listed more than once. C is incorrect because the implements keyword should be used instead of interface, and it should be listed only once. D is incorrect because implements should be used instead of interface. E is incorrect because extends is used for classes not interfaces; implements should be used instead. 15. Consider the following UML illustration for assistance with this question:
<<interface>> J <<interface>> K
<<interface>> I
What is the proper signature for interface I to inherit interfaces J and K A. public interface I extends J, K{ } B. public interface I implements J, K{ } C. public interface I implements J, implements K{ } D. public interface I interface J, K{ } Answer:
3 A A. n interface can also inherit other interfaces. Unlike classes, they can inherit or extend as many other interfaces as needed. An interface uses the keyword extends, followed by a comma-delimited list of all the other interfaces it wants to extend.
B, C,and D are incorrect. B is incorrect because only classes implement interfaces. An interface extends other interfaces. C is incorrect because extends should be used and only listed once. D is incorrect because the interface keyword is not used correctly.
Understanding Polymorphism
CERTIFICATION OBJECTIVES
l l
P olymorphism P ractical Examples of Polymorphism
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8:
Understanding Polymorphism
CERTIFICATION OBJECTIVE
Polymorphism
Exam Objective 1.5 Describe polymorphism as it applies to classes and interfaces, and describe and apply the "program to an interface" principle. Polymorphism is a fundamental aspect of object-oriented programming languages. Java is no exception to this. Polymorphism allows the developer to write code that is more generic. The generic code is more flexible and allows for easier code reuse, another fundamental object-oriented principle. The concept of programming to an interface is a manifestation of polymorphism. When a developer programs to an interface, polymorphism is used. The developer specifies the interface they are expecting instead of the actual objects. This allows any object to be used with the code as long as it implements the expected interface. This section will explore how polymorphism works, and what it allows a developer to do. The chapter will also examine the concept of programming to an interface. On the surface polymorphism can look like a complex subject. But don t be deceived. Polymorphism is just an extension of the concepts of inheritance that have already been covered.
Polymorphism
The word polymorphism comes from the Greeks and roughly means many forms. In Java, polymorphism means that one object can take the form, or place of, an object of a different type. Polymorphism can exist when one class inherits another. It can also exist when a class implements an interface. This section will describe how polymorphism can apply in both cases. Finally, this section will demonstrate what polymorphism looks like in Java code. The following topics will be discussed:
n Polymorphism via class inheritance n Polymorphism via implementing interfaces n Polymorphism in code
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