JAVA認(rèn)證：78道SCJP考試試題精解

QUESTION NO: 70 Which statement about static inner classes is true? A. An anonymous class can be declared as static. B. A static inner class cannot be a static member of the outer class. C. A static inner class does not require an instance of the enclosing class. D. Instance members of a static inner class can be referenced using the class name of the static inner class. Answer: C QUESTION NO: 71 Exhibit: 1. class A { 2. public byte getNumber () { 3. return 1; 4. } 5. } 6. 7. class B extends A { 8. public short getNumber() { 9. return 2; 10. } 11. 12. public static void main (String args[]) { 13. B b = new B (); 14. System.out.printIn(b.getNumber()) 15. } 16. } What is the result? A. Compilation succeeds and 1 is printed. B. Compilation succeeds and 2 is printed. C. An error at line 8 causes compilation to fail. D. An error at line 14 causes compilation to fail. E. Compilation succeeds but an exception is thrown at line 14. Answer: C QUESTION NO: 72 Given: AnInterface is an interface. AnAdapter0 is a non-abstract, non-final class with a zero argument constructor. AnAdapter1 is a non-abstract, non-final class without a zero argument constructor, but with a constructor that takes one int argument. Which two construct an anonymous inner class? (Choose Two) F. AnAdapter1 aa=new AnAdapter1(){} G. AnAdapter0 aa=new AnAdapter0(){} H. AnAdapter0 aa=new AnAdapter0(5){} I. AnAdapter1 aa=new AnAdapter1(5){} J. AnInterface a1=new AnInterface(5){} Answer: B, D QUESTION NO: 73 Which two statements are true? (Choose Two) A. An inner class may be declared as static. B. An anonymous inner class can be declared as public. C. An anonymous inner class can be declared as private. D. An anonymous inner class can extend an abstract class. E. An anonymous inner class can be declared as protected. Answer: A, D QUESTION NO: 74 Exhibit: 1. public class Mycircle { 2. public double radius; 3. public double diameter; 4. 5. public void setRadius(double radius) 6. this.radius = radius; 7. this.diameter= radius * 2; 8. } 9. 10. public double getRadius() { 11. return radius; 12. } 13. } Which statement is true? A. The Mycircle class is fully encapsulated. B. The diameter of a given MyCircle is guaranteed to be twice its radius. C. Lines 6 and 7 should be in a synchronized block to ensure encapsulation. D. The radius of a MyCircle object can be set without affecting its diameter. Answer: B QUESTION NO: 75 You want to limit access to a of a public class to members of the same class. Which access modifier accomplishes this objective? A. Public B. Private C. Protected D. Transient E. No access modifier is required Answer: B QUESTION NO: 76 Exhibit: ClassOne.java 1. package com.abc.pkg1; 2. public class Class

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