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Self Test
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Interface Implementation (Sun Objective 4.2)
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12. Given the following,
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1. 2. 3. 4. 5. 6. 7. 8. interface DoMath { double getArea(int rad); } interface MathPlus { double getVol(int b, int h); }
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which two code fragments inserted at lines 7 and 8 will compile (Choose two.)
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A. class AllMath extends DoMath { double getArea(int r); } B. interface AllMath implements MathPlus { double getVol(int x, int y); } C. interface AllMath extends DoMath { float getAvg(int h, int l); } D. class AllMath implements MathPlus { double getArea(int rad); } E. abstract class AllMath implements DoMath, MathPlus { public double getArea(int rad) { return rad * rad * 3.14; } } 13. Which three are valid method signatures in an interface (Choose three.) A. private int getArea(); B. public float getVol(float x); C. public void main(String [] args); D. public static void main(String [] args); E. boolean setFlag(Boolean [] test []); 14. Which two statements are true for any concrete class implementing the java.lang.Runnable interface (Choose two.) A. You can extend the Runnable interface as long as you override the public run() method.
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2: Declarations and Access Control
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B. The class must contain a method called run() from which all code for that thread will be initiated. C. The class must contain an empty public void method named run(). D. The class must contain a public void method named runnable(). E. The class definition must include the words implements Threads and contain a method called run(). F.
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The mandatory method must be public, with a return type of void, must be called run(), and cannot take any arguments.
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15. Given the following,
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1. 2. 3. 4. interface Base { boolean m1 (); byte m2(short s); }
which two code fragments will compile (Choose two.)
A. interface Base2 implements Base {} B. abstract class Class2 extends Base { public boolean m1() { return true; } } C. abstract class Class2 implements Base { } D. abstract class Class2 implements Base { public boolean m1() { return (7 > 4); } } E. class Class2 implements Base { boolean m1() { return false; } byte m2(short s) { return 42; } }
Self Test Answers
SELF TEST ANSWERS
Declarations and Modifiers
1. E. default access is the package oriented access modifier. A and C are wrong because public and protected are less restrictive. B and D are wrong because abstract and synchronized are not access modifiers. 2. C. The private access modifier limits access to members of the same class. A, B, D, E, and F are wrong because protected and default are the wrong access modifiers, and final, static, and volatile are modifiers but not access modifiers. 3. A, C, and E. A and C are correct, because an abstract class does not need to implement any of its superclass methods. E is correct because as it stands, it is a valid concrete extension of class A. B is wrong because an abstract class does not need to implement any of its superclass methods. D is wrong because a class that extends another class is free to add new methods. F is wrong because it is legal to extend an abstract class from a concrete class. 4. C, F. Both are legal class declarations. A is wrong because a class cannot be abstract and final there would be no way to use such a class. B is wrong because interfaces and classes cannot be marked as static. D and E are wrong because classes and interfaces cannot be marked as protected. 5. E. Statements 1, 2, 4, 5, and 6 are legal declarations. A, B, C, D, and F are incorrect because the only illegal declaration is 3; transient applies only to variable declarations, not to method declarations. As you can see from these other examples, method declarations can be very extensive. 6. C. The ParentUtil instance p cannot be used to access the doStuff() method. Because doStuff() has protected access, and the ChildUtil class is not in the same package as the ParentUtil class, doStuff() can be accessed only by instances of the ChildUtil class (a subclass of ParentUtil). A, B, D, and E are incorrect because of the access rules described previously.
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