複選題
192 

Which three code fragments, inserted independently at line 6, will compile? (Choose three.)
(A) list.add("foo");
(B) Object o = list;
(C) String s = list.get(0);
(D) list = new ArrayList＜String＞();
(E) list = new ArrayList＜Object＞();

188 What three changes allow the class to be used with generics and avoid an unchecked warning? (Choose three.)   1. Remove line 14.  2. Replace line 14 with "int i = iter.next();".  3. Replace line 13 with "for(int i : intList){".  4. Replace line 13 with "for(Iterator iter : intList){".   5. Replace the method declaration with "sum(List＜int＞ intList)".  6. Replace the method declaration with "sum(List＜Integer＞ intList)". (A) 123 (B) 246 (C) 136 (D) 456

189 What is the result? (A) Compilation fails due to an error in line 23. (B) Compilation fails due to an error in line 29. (C) A ClassCastException occurs in line 29. (D) A ClassCastException occurs in line 31. (E) The value of all four objects prints in natural order.

190 What is the result? (A) 0 (B) 1 (C) 2 (D) 3 (E) 4 (AB) Compilation fails. (AC) An exception is thrown at runtime.

191 Which two, inserted at line 11, will allow the code to compile? (Choose two.)   1. public class MinMax＜?＞{  2. public class MinMax＜? extends Number＞{  3. public class MinMax＜N extends Object＞{  4. public class MinMax＜N extends Number＞{  5. public class MinMax＜? extends Object＞{  6. public class MinMax＜N extends Integer＞{ (A) 15 (B) 23 (C) 46 (D) 56

193 What is the result? (A) apple pear (B) banana pear (C) apple apple (D) apple banana (E) banana banana

194 Which statement is true? (A) The expressions (ONE == ONE) and ONE.equals(ONE) are both guaranteed to be true. (B) The expression (ONE ＜ TWO) is guaranteed to be true and ONE.compareTo(TWO) is guaranteed to be less than one. (C) The Example values cannot be used in a raw java.util.HashMap; instead, the programmer must use a java.util.EnumMap. (D) The Example values can be used in a java.util.SortedSet, but the set will NOT be sorted because enumerated types do NOT implement java.lang.Comparable.

195 What is the result? (A) 2 1 0 (B) 2 1 1 (C) 3 2 1 (D) 3 2 2 (E) Compilation fails. (AB) An exception is thrown at runtime.

196 What inserted at line 39, will sort the keys in the props HashMap? (A) Arrays.sort(s); (B) s = new TreeSet(s); (C) Collections.sort(s); (D) s = new SortedSet(s);

197  What is the result? (A) A, B, C, (B) B, C, A, (C) Compilation fails. (D) The code runs with no output (E) An exception is thrown at runtime.

198 What is the result? (A) 3, 2, 1, (B) 1, 2, 3, (C) Compilation fails. (D) The code runs with no output. (E) An exception is thrown at runtime.