visual basic barcode printing 5: Object Orientation, Overloading and Overriding, Constructors, and Return Types in Java

Creation PDF417 in Java 5: Object Orientation, Overloading and Overriding, Constructors, and Return Types

5: Object Orientation, Overloading and Overriding, Constructors, and Return Types
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C. return (Object) (new int [] {1,2,3} ); D. ArrayList a = new ArrayList(); return a; E. return (Object) "test"; F.
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return (Float) 4.3;
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21. Given the following,
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1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. class Test { public static Foo f = new Foo(); public static Foo f2; public static Bar b = new Bar(); public static void main(String [] args) { for (int x=0; x<6; x++) { f2 = getFoo(x); f2.react(); } } static Foo getFoo(int y) { if ( 0 == y % 2 ) { return f; } else { return b; } } } class Bar extends Foo { void react() { System.out.print("Bar "); } } class Foo { void react() { System.out.print("Foo "); } }
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A. Bar Bar Bar Bar Bar Bar B. Foo Bar Foo Bar Foo Bar C. Foo Foo Foo Foo Foo Foo D. Compilation fails. E. An exception is thrown at runtime.
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Encapsulation, IS-A, HAS-A (Sun Objective 6.1)
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1. D. If a class has an instance variable that is marked public, the class cannot be said to be encapsulated. A, B, C, E, and F are incorrect based on the program logic described above. Public getter and setter methods are compatible with the concept of encapsulation. 2. D. Class A is clearly not encapsulated because it has a public instance variable. At first glance class B appears to be encapsulated, however because it extends from class A it inherits the public instance variable foo, which is not encapsulated. A, B, and C are incorrect based on the program logic described above. 3. A. One of the main benefits of encapsulation is that encapsulated code is much easier to reuse than unencapsulated code. B, C, D, and E are incorrect. B is incorrect because inheritance is a concept that is independent of encapsulation. C and D are incorrect because encapsulation does not restrict the use of overloading or overriding. E is incorrect because HAS-A relationships are independent of encapsulation. 4. B and E. Encapsulation tends to make code more maintainable, extensible, and debuggable, but not necessarily any more efficient at runtime. Encapsulation is a design approach and in no way affects any Java language rules such as the use of access modifiers. A, C, and D are well-known benefits of encapsulation. 5. C and E. C is correct because class A has an instance variable, c, that is a reference to an object of class C. E is correct because class B extends from class A, which HAS-A class C reference, so class B, through inheritance, HAS-A class C. A, B, and D are incorrect based on the program logic described. A is incorrect because class B extends from class A, not the other way around. B is incorrect because class C is not in class A s inheritance tree. D is incorrect because class B IS-A class A; HAS-A is not used to describe inheritance relationships.
Overriding and Overloading (Sun Objective 6.2)
6. B. Reference variable a is of type A, but it refers to an object of type B. Line 9 is a polymorphic call, and the VM will use the version of the baz() method that is in the class that the reference variable refers to at that point. A, C, and D are incorrect because of the logic described above.
5: Object Orientation, Overloading and Overriding, Constructors, and Return Types
7. B. B is neither a legal override (the return type has been changed) nor a legal overload (the arguments have not changed). A, C, and D are legal overrides of the doStuff() method, and E and F are legal overloads of the doStuff() method. 8. E. Line 14 is an illegal override of the doStuff() method in ParentClass. When you override a method, you must leave both the arguments and the return types the same. A, B, C, D, and F are incorrect based on the program logic described above. If line 14 had returned an int, then B would be correct. 9. C and E. C is an illegal override because the private modifier is more restrictive than doStuff() s default modifier in class Over. E is an illegal override because you can t change an overridden method s return type, or E is an illegal overload because you must change an overloaded method s arguments. A and B are simple overrides (protected is less restrictive than default). D and F are simple overloads (swapping arguments of different types creates an overload).
Instantiation and Constructors (Sun Objectives 6.3 and 1.3)
10. D. The class Child constructor calls the class Parent constructor implicitly before any code in the Child constructor runs. When the class Parent constructor s code runs, it prints the first line of output, finishes, and returns control to the Child constructor, which prints out its line of output and finishes. The call to super() is redundant. A, B, C, E, and F are incorrect based on the program logic described above. 11. E. Line 17 will cause the compiler to fail. The call to super() must be the first statement in a constructor. A, B, C, D, and F are incorrect based on the program logic described above. If line 17 were removed, D would be correct. 12. B. Class MySuper does not need a no-args constructor because MySub explicitly calls the MySuper constructor with an argument. A is incorrect because other than the implicit calls to super(), constructors run in order from base class to extended class, so MySuper s output will print first. C, D, E, and F are incorrect based on the program logic described above. 13. E. The main() method calls the long constructor which calls the int constructor, which calls the no-arg constructor, which runs, then returns to the int constructor, which runs, then returns to the long constructor, which runs last. A, B, C, D, and F are incorrect based on the program logic described above.
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