173. Given: 

11. public class Yikes{ 

12. 

13. public static void go(Long n){System.out.print("Long ")；}

 14. public static void go(Short n){System. outprint("Short ")；} 

15. public static void go(int n){System.out.print("int ")；} 

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

 17. short y = 6；

 18. long z = 7； 

19. go(y)； 

20. go(z)；

 21. }

 22. }

 What is the result?
(A) int Long
(B) Short Long
(C) Compilation fails.
(D) An exception is thrown at runtime.

168. Given: 11. public void testIfA(){ 12. if(testIfB("True")){ 13. System.out.println("True")； 14. }else{ 15. System.out.println("Not true")； 16. } 17. } 18. public Boolean testIfB(String str){ 19. return Boolean.valueOf(str)； 20. } What is the result when method testIfA is invoked? (A) True (B) Not true (C) An exception is thrown at runtime. (D) Compilation fails because of an error at line 12. (E) Compilation fails because of an error at line 19.

170. Given: 12. String csv = "Sue,5,true,3"； 13. Scanner scanner = new Scanner(csv)； 14. scanner.useDelimiter(",")； 15. int age = scanner.nextInt(), What is the result? (A) Compilation fails. (B) After line 15, the value of age is 5. (C) After line 15, the value of age is 3. (D) An exception is thrown at runtime.

171. Given: 11. String test = "a1b2c3"； 12. String[] tokens = test.split("\d")； 13. for(String s : tokens) System.out.print(s + " ")； What is the result? (A) a b c (B) 1 2 3 (C) a1b2c3 (D) a1 b2 c3 (E) Compilation fails.

172. Given: 33. Date d = new Date(0)； 34. String ds = "December 15, 2004"； 35. //insert code here 36. try{ 37. d = df.parse(ds)； 38. } 39. catch(ParseException e){ 40. System.out.println("Unable to parse " + ds)； 41. } 42. //insert code here too What creates the appropriate DateFormat object and adds a day to the Date object? (A) 35. DateFormat df = DateFormat.getDateFormat()； 42. d.setTime((60 * 60 * 24) + d.getTime()； (B) 35. DateFormat df = DateFormat.getDateInstance()； 42. d.setTime((1000 * 60 * 60 * 24) + d.getTime())； (C) 35. DateFormat df = DateFormat.getDateFormat()； 42. d.setLocalTime((1000 * 60 * 60 * 24) + d.getLocalTime())； (D) 35. DateFormat df = DateFormat.getDateInstance()； 42. d.setLocalTime((60 * 60 * 24) + d.getLocalTime())；

174. Given: 12. Date date = new Date()； 13. df.setLocale(Locale.ITALY)； 14. String s = df.format(date)； The variable df is an object of type DateFormat that has been initialized in line 11. What is the result if this code is run on December 14, 2000? (A) The value of s is 14-dic-2000. (B) The value of s is Dec 14, 2000. (C) An exception is thrown at runtime. (D) Compilation fails because of an error in line 13.

複選題175. Which two scenarios are NOT safe to replace a StringBuffer object with a StringBuilder object? (Choose two.) (A) When using versions of Java technology earlier than 5.0. (B) When sharing a StringBuffer among multiple threads. (C) When using the java.io class StringBufferInputStream. (D) When you plan to reuse the StringBuffer to build more than one string. (E) Enitiation of separate design processes to the separation of users

177. Given: 11. String test = "This is a test"； 12. String[] tokens = test.split("s")； 13. System.out.println(tokens.length)； What is the result? (A) 0 (B) 1 (C) 4 (D) Compilation fails. (E) An exception is thrown at runtime.

178. Given: 1. public class Target{ 2. private int i = 0； 3. public int addOne(){ 4. return ++i； 5. } 6. } And: 1. public class Client{ 2. public static void main(String[] args){ 3. System.out.println(new Target().addOne())； 4. } 5. } Which change can you make to Target without affecting Client? (A) Line 4 of class Target can be changed to return i++； (B) Line 2 of class Target can be changed to private int i = 1； (C) Line 3 of class Target can be changed to private int addOne(){ (D) Line 2 of class Target can be changed to private Integer i = 0；

185. Given: 1. public class Person{ 2. private String name；  3. public Person(String name){this.name = name；} 4. public boolean equals(Person p){ 5. return p.name.equals(this.name)； 6. } 7. } Which statement is true? (A) The equals method does NOT properly override the Object.equals method. (B) Compilation fails because the private attribute p.name cannot be accessed in line 5. (C) To work correctly with hash-based data structures, this class must also implement the hashCode method. (D) When adding Person objects to a java.util.Set collection, the equals method in line 4 will prevent duplicates.

複選題186. Which two statements are true about the hashCode method? (Choose two.) (A) The hashCode method for a given class can be used to test for object equality and object inequality for that class. (B) The hashCode method is used by the java.util.SortedSet collection class to order the elements within that set. (C) The hashCode method for a given class can be used to test for object inequality, but NOT object equality, for that class. (D) The only important characteristic of the values returned by a hashCode method is that the distribution of values must follow a Gaussian distribution. (E) The hashCode method is used by the java.util.HashSet collection class to group the elements within that set into hash buckets for swift retrieval.