90. Given:

 11. interface DeclareStuff{ 

12. public static final int EASY = 3； 

13. void doStuff(int t)；}

 14. public class TestDeclare implements DeclareStuff{

 15. public static void main(String[] args){ 

16. int x = 5；

 17. new TestDeclare().doStuff(++x)； 

18. }

 19. void doStuff(int s){ 

20. s += EASY + ++s； 

21. System.out.println("s " + s)； 

22. }

 23. }

 What is the result?
(A) s 14
(B) s 16
(C) s 10
(D) Compilation fails.
(E) An exception is thrown at runtime.

84. Given: 11. class Alpha{ 12. public void foo(){System.out.print("Afoo ")；} 13. } 14. public class Beta extends Alpha{ 15. public void foo(){System.out.print("Bfoo ")；} 16. public static void main(String[] args){ 17. Alpha a = new Beta()； 18. Beta b = (Beta)a； 19. a.foo()；20. b.foo()； 21. } 22. } What is the result? (A) Afoo Afoo (B) Afoo Bfoo (C) Bfoo Afoo (D) Bfoo Bfoo (E) Compilation fails.

85. Given: 11. class Animal{public String noise(){return "peep"；}} 12. class Dog extends Animal{ 13. public String noise(){return "bark"；} 14 } 15. class Cat extends Animal{ 16. public String noise(){return "meow"；} 17. } ... 30. Animal animal = new Dog()； 31. Cat cat = (Cat)animal；32. System.out.println(cat.noise())； What is the result? (A) peep (B) bark (C) meow (D) Compilation fails. (E) An exception is thrown at runtime.

87. A team of programmers is involved in reviewing a proposed design for a new utility class, After some discussion, they realize that the current design allows other classes to access methods in the utility class that should be accessible only to methods within the utility class itself. What design issue has the team discovered? (A) Tight coupling (B) Low cohesion (C) High cohesion (D) Loose coupling (E) Weak encapsulation

複選題89. Given: 1. public class Car{ 2. private int wheelCount； 3. private String vin； 4. public Car(String vin){ 5. this.vin = vin； 6. this.wheelCount = 4； 7. } 8. public String drive(){ 9. return "zoom-zoom"； 10. } 11. public String getInfo(){ 12. return "VIN: " + vin + "wheels: " + wheelCount； 13. } 14. } And: 1. public class MeGo extends Car{ 2. public MeGo(String vin){ 3. this.wheelCount = 3； 4. } 5. } What two must the programmer do to correct the compilation errors? (Choose two.) (A) insert a call to this() in the Car constructor (B) insert a call to this() in the MeGo constructor (C) insert a call to super() in the MeGo constructor (D) insert a call to super(vin) in the MeGo constructor (E) change the wheelCount variable in Car to protected

92. Given a correctly compiled class whose source code is: 1. package com.sun.sjcp； 2. public class Commander { 3. public static void main(String[] args) { 4. // more code here 5. } 6. } Assume that the class file is located in /foo/com/sun/sjcp/, the current directory is /foo/, and that the classpath contains "." (current directory). Which command line correctly runs Commander? (A) java Commander (B) java com.sun.sjcp.Commander (C) java com/sun/sjcp/Commander (D) java -cp com.sun.sjcp Commander (E) java -cp com/sun/sjcp Commander

93. Given: 10. class Nav{ 11. public enum Direction { NORTH, SOUTH, EAST, WEST } 12. } 13. public class Sprite{ 14. //insert code here 15. } Which code, inserted at line 14, allows the Sprite class to compile? (A) Direction d = NORTH； (B) Nav.Direction d = NORTH； (C) Direction d = Direction.NORTH； (D) Nav.Direction d = Nav.Direction.NORTH；

94. Given: 11. public class Rainbow { 12. public enum MyColor { 13. RED(0xff0000), GREEN(0x00ff00), BLUE(0x0000ff)； 14. private final int rgb； 15. MyColor(int rgb){this.rgb = rgb；} 16. public int getRGB(){return rgb；} 17. } 18. public static void main(String[] args){ 19. //insert code here 20. } 21. } Which code fragment inserted at line 19, allows the Rainbow class to compile? (A) MyColor skyColor = BLUE； (B) MyColor treeColor = MyColor.GREEN； (C) if(RED.getRGB() ＜ BLUE.getRGB()){} (D) Compilation fails due to other error(s) in the code. (E) MyColor purple = new MyColor(0xff00ff)；

95. Given: 1. interface TestA{String toString()；} 2. public class Test{ 3. public static void main(String[] args){ 4. System.out.println(new TestA(){ 5. public String toString(){return "test"；} 6. })； 7. } 8. } What is the result? (A) test (B) null (C) An exception is thrown at runtime. (D) Compilation fails because of an error in line 1. (E) Compilation fails because of an error in line 4.

97. Which statement is true? (A) A class's finalize() method CANNOT be invoked explicitly. (B) super.finalize() is called implicitly by any overriding finalize() method. (C) The finalize() method for a given object is called no more than once by the garbage collector. (D) The order in which finalize() is called on two objects is based on the order in which the two objects became finalizable.

98. Given: 15. public class Yippee{ 16. public static void main(String[] args){ 17. for(int x = 1； x ＜ args.length； x++){ 18. System.out.print(args[x] + " ")； 19. } 20. } 21. } and two separate command line invocations: java Yippee java Yippee 1 2 3 4 What is the result? (A) No output is produced. 1 2 3 (B) No output is produced. 2 3 4 (C) No output is produced. 1 2 3 4 (D) An exception is thrown at runtime. 1 2 3 (E) An exception is thrown at runtime. 2 3 4 F. An exception is thrown at runtime. 1 2 3 4