第14題 Given: 11. class Person{ 12. String name = "No name"; 13. public Person(String nm){name = nm;} 14. } 15. 16. class Employee extends Person{ 17. String empID = "0000"; 18. public Employee(String id){empID = id;} 19. } 20. 21. class EmployeeTest{ 22. public static void main(String[] args){ 23. Employee e = new Employee("4321"); 24. System.out.println(e.empID); 25. } 26. } What is the result?
(A) 4321
(B) 0000
(C) An exception is thrown at runtime.
(D) Compilation fails because of an error in line 18.

第9題 Given: 11. String[] elements = {"for", "tea", "too"}; 12. String first = (elements.length>0) ? elements[0] : null; What is the result? (A) Compilation fails. (B) An exception is thrown at runtime. (C) The variable first is set to null. (D) The variable first is set to elements[0]

第10題 Given: 1. import java.util.*; 2. public class Quest{ 3. public static void main(String[] args){ 4. String[] colors = 5. {"blue","red","green","yellow","orange"}; 6. Arrays.sort(colors); 7. int s2 = Arrays.binarySearch(colors, "orange"); 8. int s3 = Arrays.binarySearch(colors, "violet"); 9. System.out.print(s2 + "" + s3); 10. } 11. } What is the result? (A) 2-1 (B) 2-4 (C) 2-5 (D) 3-1 (E) 3-4 F. 3-5 G. Compilation fails. H. An exception is thrown at runtime.

第11題 Given: 1. class Alligator{ 2. public static void main(String[] args){ 3. int[]x[] = {{1,2},{3,4,5},{6,7,8,9}}; SCJP 6.0 認證教戰手冊 黃彬華著 碁峰出版 6 4. int[][]y = x; 5. System.out.print(y[2][1]); 6. } 7. } What is the result? (A) 2 (B) 3 (C) 4 (D) 6 (E) 7 F. Compilation fails.

第13題 Given: 1. public class Barn{ 2. public static void main(String[] args){ private void bar(int x){} public void bar(int x){} public int bar(String x){return 1;} public Alpha bar(int x){} public void bar(int x, int y){} public int bar(int x){return x;} Methods SCJP 6.0 認證教戰手冊 黃彬華著 碁峰出版 7 3. new Barn.go("hi", 1); 4. new Barn.go("hi", "world", 2); 5. } 6. public void go(String... y, int x){ 7. System.out.print(y[y.length-1] + " "); 8. } 9. } What is the result? (A) hi hi (B) hi world (C) world world (D) Compilation fails. (E) An exception is thrown at runtime.

第15題 Given: 11. class Mud{ SCJP 6.0 認證教戰手冊 黃彬華著 碁峰出版 8 12. //insert code here 13. System.out.println("hi"); 14. } 15. } And the following five fragments: public static void main(String...a){ public static void main(String.* a){ public static void main(String... a){ public static void main(String[]... a){ public static void main(String...[] a){ How many of the code fragments, inserted independently at line 12, compile? (A) 0 (B) 1 (C) 2 (D) 3 (E) 4 F. 5

複選題第16題 Given: 5. class Atom{ 6. Atom(){System.out.print("atom ");} 7. } 8. class Rock extends Atom{ 9. Rock(String type){System.out.print(type);} 10. } 11. public class Mountain extends Rock{ 12. Mountain(){ 13. super("granite "); 14. new Rock("granite "); 15. } 16. public static void main(String[] a){new Mountain();} 17. } What is the result? A(B) Compilation fails. A(C) atom granite A(D) granite granite A(E) atom granite granite B(C) An exception is thrown at runtime. B(D) atom granite atom granite 答案：F

複選題第18題 Given: 1. class Super{ 2. private int a; 3. protected Super(int a){this.a = a;} 4. } ... 11. class Sub extends Super{ 12. public Sub(int a){super(a);} 13. public Sub(){this.a = 5;} 14. } Which two, independently, will allow Sub to compile? (Choose two.) (A) Change line 2 to: public int a; (B) Change line 2 to: protected int a; (C) Change line 13 to: public Sub(){this(5);} (D) Change line 13 to: public Sub(){super(5);} (E) Change line 13 to: public Sub(){super(a);}

第19題 Which Man class properly represents the relationship "Man has a best friend who is a Dog"? (A) class Man extends Dog{} (B) class Man implements Dog{} (C) class Man{private BestFriend dog;} (D) class Man{private Dog bestFriend;} (E) class Man{private Dog;} F. class Man{private BestFriend;}

複選題第20題 A team of programmers is reviewing a proposed API for a new utility class. After some discussion, they realize that they can reduce the number of methods in the API without losing any functionality. If they implement the new design, which two OO principles will they be promoting? (A) Looser coupling (B) Tighter coupling (C) Lower cohesion (D) Higher cohesion (E) Weaker encapsulation F. Stronger encapsulation

第21題 Given: 1. class Batman{ 2. int squares = 81; 3. public static void main(String[] args){ 4. new Batman().go(); 5. } 6. void go(){ 7. incr(++squares); 8. System.out.println(squares); 9. } 10. void incr(int squares){squares += 10;} 11. } What is the result? SCJP 6.0 認證教戰手冊 黃彬華著 碁峰出版 11 (A) 81 (B) 82 (C) 91 (D) 92 (E) Compilation fails. F. An exception is thrown at runtime.