165. Given: 

5. import java.util.Date；

 6. import java.text.DateFormat； 

21. DateFormat df； 

22. Date date = new Date()；

 23. //insert code here 

24. String s = df.format(date)； 

Which code fragment, inserted at line 23, allows the code to compile?
(A) df = new DateFormat()；
(B) df = Date.getFormat()；
(C) df = date.getFormat()；
(D) df = DateFormat.getFormat()；
(E) df = DateFormat.getInstance()；

161. Given: 1. public class Boxer1{ 2. Integer i 3. int x； 4. public Boxer1(int y){ 5. x = i + y； 6. System.out.println(x)； 7. } 8. public static void main(String[] args){ 9. new Boxer1(new Integer(4))； 10. } 11. } What is the result? (A) The value "4" is printed at the command line. (B) Compilation fails because of an error in line 5. (C) Compilation fails because of an error in line 9. (D) A NullPointerException occurs at runtime. (E) A NumberFormatException occurs at runtime.

162. Given: 11. public static void main(String[] args){ 12. Integer i = new Integer(1) + new Integer(2)； 13. switch(i){ 14. case 3: System.out.println("three")； break； 15. default: System.out.println("other")； break； 16. } 17. } What is the result? (A) three (B) other (C) An exception is thrown at runtime. (D) Compilation fails because of an error on line 12. (E) Compilation fails because of an error on line 13. 

複選題163. 32 Given: 1. public class TestString3{ 2. public static void main(String[] args){ 3. //insert code here 5. System.out.println(s)； 6. } 7. } Which two code fragments, inserted independently at line 3, generate the output 4247? (choose two.) (A) String s = "123456789"； s = (s - "123").replace(1, 3, "24") - "89"； (B) StringBuffer s = new StringBuffer("123456789")； s.delete(0, 3).replace(1, 3, "24").delete(4, 6)； (C) StringBuffer s = new StringBuffer("123456789")； s.substring(3, 6).delete(1, 3).insert(1, "24")； (D) StringBuilder s = new StringBuilder("123456789")； s.substring(3, 6).delete(1, 2).insert(1, "24")； (E) StringBuilder s = new StringBuilder("123456789")； s.delete(0, 3).delete(1, 3).delete(2, 5).insert(1, "24")；

164. Given: 1. d is a valid, non-null Date object 2. df is a valid, non-null DateFormat object set to the current locale What outputs the current locale's country name and the appropriate version of d's date? (A) Locale loc = Locale.getLocale()； System.out.println(loc.getDisplayCountry() + " " + df.format(d))； (B) Locale loc = Locale.getDefault()； System.out.println(loc.getDisplayCountry() + " " + df.format(d))； (C) Locale loc = Locale.getLocale()； System.out.println(loc.getDisplayCountry() + " " + df.setDateFormat(d))； (D) Locale loc = Locale.getDefault()； System.out.println(loc.getDisplayCountry() + " " + df.setDateFormat(d))；

166. Given: 1. public class BuildStuff{ 2. public static void main(String[] args){ 3. Boolean test = new Boolean(true)； 4. Integer x = 343； 5. Integer y = new BuildStuff().go(test, x)； 6. System.out.println(y)； 7. } 8. int go(Boolean b, int i){ 9. if(b) return (i/7)； 10. return (i/49)； 11. } 12. } What is the result? (A) 7 (B) 49 (C) 343 (D) Compilation fails. (E) An exception is thrown at runtime.

167. Given: 11. String test = "Test A. Test B.Test C."； 12. //insert code here 34  13. String[] result = test.split(regex)； Which regular expression, inserted at line 12, correctly splits test into "Test A", "Test B", and "Test C"? (A) String regex = ""； (B) String regex = " "； (C) String regex = ".*"； (D) String regex = "\s"； (E) String regex = "\.\s*"；

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())；