160. Given: 

22. StringBuilder sb1 = new StringBuilder("123")； 

23. String s1 = "123"；

 24. //insert code here 

25. System.out.println(sb1 + " " + s1)；

 Which code fragment, inserted at line 24, outputs "123abc 123abc"?
(A) sb1.append("abc")； s1.append("abc")；
(B) sb1.append("abc")； s1.concat("abc")；
(C) sb1.concat("abc")； s1.append("abc")；
(D) sb1.concat("abc")； s1.concat("abc")；
(E) sb1.append("abc")； s1 = s1.concat("abc")； 

複選題154. Given that c is a reference to a valid java.io.Console object, which two code fragments read a line of text from the console? (Choose two.) (A) String s = c.readLine()； (B) char[] c = c.readLine()； (C) String s = c.readConsole()； (D) char[] c = c.readConsole()； (E) String s = c.readLine("%s", "name ")； 

157. Given that c is a reference to a valid java.io.Console object, and: 11. String pw = c.readPassword("%s", "pw: ")； 12. System.out.println("got " + pw)； 13. String name = c.readLine("%s", "name: ")； 14. System.out.println(" got", name)； If the user types fido when prompted for a password, and then responds bob when prompted for a name, what is the result? (A) pw: got fido name: bob got bob (B) pw: fido got fido name: bob got bob (C) pw: got fido name: bob got bob (D) pw: fido got lido name: bob got bob (E) Compilation fails. 

158. Given a vaid DateFormat object named df, and 16. Date d = new Date(0L)； 17. String ds = "December 15, 2004"； 18. //insert code here What updates d's value with the date represented by ds? (A) 18. d = df.parse(ds)； (B) 18. d = df.getDate(ds)；  (C) (D)

159. Given: 11. double input = 314159.26； 12. NumberFormat nf = NumberFormat.getInstance(Locale.ITALIAN)； 13. String b； 14. //insert code here Which code, inserted at line 14, sets the value of b to 314.159,26? (A) b = nf.parse(input)； (B) b = nf.format(input)； (C) b = nf.equals(input)； (D) b = nf.parseObject(input)；

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))；

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()；

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.