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A. Class Barbell is tightly encapsulated. B. Line 2 is in conflict with encapsulation. C. Line 5 is in conflict with encapsulation. D. Line 8 is in conflict with encapsulation. E. Lines 5 and 8 are in conflict with encapsulation. F.
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Lines 2, 5, and 8 are in conflict with encapsulation.
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2. Given the following,
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1. 2. 3. 4. 5. 6. 7. 8. 9. public class B extends A { private int bar; public void setBar(int b) { bar = b; } } class A { public int foo; }
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A. Class A is tightly encapsulated.
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B. Class B is tightly encapsulated. C. Classes A and B are both tightly encapsulated. D. Neither class A nor class B is tightly encapsulated. 3. Which is true A. Tightly encapsulated classes are typically easier to reuse. B. Tightly encapsulated classes typically use inheritance more than unencapsulated classes. C. Methods in tightly encapsulated classes cannot be overridden. D. Methods in tightly encapsulated classes cannot be overloaded. E. Tightly encapsulated classes typically do not use HAS-A relationships. 4. Which two are not benefits of encapsulation (Choose two.) A. Clarity of code B. Code efficiency C. The ability to add functionality later on D. Modifications require fewer coding changes E. Access modifiers become optional 5. Given the following,
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1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. class B extends A { int getID() { return id; } } class C { public int name; } class A { C c = new C(); public int id; }
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which two are true about instances of the classes listed above (Choose two.)
A. A is-a B B. C is-a A C. A has-a C D. B has-a A E. B has-a C
5: Object Orientation, Overloading and Overriding, Constructors, and Return Types
Overriding and Overloading (Sun Objective 6.2)
6. Given the following,
class A { public void baz() { System.out.println("A"); } } public class B extends A { public static void main(String [] args) { A a = new B(); a.baz(); } public void baz() { System.out.println("B"); } }
what is the result
A. A B. B C. Compilation fails. D. An exception is thrown at runtime. 7. Given the following,
class Foo { String doStuff(int x) { return "hello"; } }
which method would not be legal in a subclass of Foo
A. String doStuff(int x) { return "hello"; } B. int doStuff(int x) { return 42; } C. public String doStuff(int x) { return "Hello"; } D. protected String doStuff(int x) { return "Hello"; } E. String doStuff(String s) { return "Hello"; } F.
int doStuff(String s) { return 42; }
8. Given the following,
1. 2. 3. class ParentClass { public int doStuff(int x) { return x * 2;
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4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17.
} } public class ChildClass extends ParentClass { public static void main(String [] args ) { ChildClass cc = new ChildClass(); long x = cc.doStuff(7); System.out.println("x = " + x); } public long doStuff(int x) { return x * 3; } }
What is the result
A. x = 14 B. x = 21 C. Compilation fails at line 2. D. Compilation fails at line 11. E. Compilation fails at line 14. F.
An exception is thrown at runtime.
9. Given the following,
1. 2. 3. 4. 5. 6. 7. 8. 9. class Over { int doStuff(int a, float b) { return 7; } } class Over2 extends Over { // insert code here }
which two methods, if inserted independently at line 8, will not compile (Choose two.)
A. public int doStuff(int x, float y) { return 4; } B. protected int doStuff(int x, float y) {return 4; } C. private int doStuff(int x, float y) {return 4; } D. private int doStuff(int x, double y) { return 4; } E. long doStuff(int x, float y) { return 4; } F.
int doStuff(float x, int y) { return 4; }
5: Object Orientation, Overloading and Overriding, Constructors, and Return Types
Instantiation and Constructors (Sun Objectives 6.3 and 1.3)
10. Given the following,
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. public class TestPoly { public static void main(String [] args ){ Parent p = new Child(); } } class Parent { public Parent() { super(); System.out.println("instantiate a parent"); } } class Child extends Parent { public Child() { System.out.println("instantiate a child"); } }
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