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APPENDIX D
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(b) The remove() method removes the last element returned by either next() or previous() method The four next() calls return A, B, C, and D D is subsequently removed The two previous() calls return C and B B is subsequently removed
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[1, 3, 2] is printed First, "1" and "2" are appended to an empty list Next, "3" is inserted between "1" and "2", and then the list is duplicated The original list is concatenated with the copy The sequence of elements in the list is now "1", "3", "2", "1", "3", "2" Then a sublist view allowing access to elements from index 2 to index 5 (exclusive) is created (ie, the subsequence "2", "1", "3") The sublist is cleared,
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thus removing the elements This is reflected in the original list and the sequence of elements is now "1", "3", "2" 1521 (b) and (d) The methods add() and retainAll(), return the value true if the collection was modified during the operation The contains() and containsAll() methods return a boolean value, but these membership operations never modify the current collection, and the return value indicates the result of the membership test The clear() method does not return a value 1522 (c), (d), (e), and (f) Sets cannot have duplicates HashSet does not guarantee the order of the elements in (a) and (b), therefore there is no guarantee that the program will print [1, 9] Because LinkedHashSet maintains elements in insertion order in (c) and (d), the program is guaranteed to print [1, 9] Because TreeSet maintains elements sorted according to the natural ordering in (e) and (f), the program is guaranteed to print [1, 9] 1523 (c) Note that the methods higher() and lower() are stricter than the methods ceiling() and floor() 1524 (c) and (d) The output from each statement is shown below
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(a) (b) (c) (d) (e) (f) [set, shell, soap] [set, shell] [soap, swan] [swan] [shell, soap] [set, shell]
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APPENDIX D
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(b), (c), and (d) The method poll() is specified in the Queue interface which is implemented by the LinkedList and PriorityQueue classes, thus ruling out (a), (e), and (f) The NavigableSet interface specifies the pollFirst() and pollLast() methods
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(c) (a) uses an iterator which does not guarantee the order of traversal (b) traverses the queue, but only peeks at the (same) head element each time (d) uses an iterator, but tries to change the queue structurally by calling the poll() method at the same time, resulting in a javautilConcurrentModificationException Polling in (c) is done according to the priority ordering, which in this case is natural ordering for strings
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(c) and (d) The Map<K,V> interface defines the methods remove() and values() It does not define methods contains(), addAll(), and toArray() Methods with these names are defined in the Collection interface, but Map does not inherit from Collection
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(b) and (d) Although all the keys in a map must be unique, multiple identical values may exist Since values are not unique, the values() method returns a Collection instance and not a Set instance The collection objects returned by the keySet(), entrySet(), and values() methods are backed by the original Map object This means that changes made in one are reflected in the other Although implementations of SortedMap keep the entries sorted on the keys, this is not a requirement for classes that implement Map For instance, the entries in a HashMap are not sorted
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(c) and (e) The classes TreeSet and TreeMap implement the comparator() method The comparator() method is defined in the SortedSet and SortedMap interfaces, and the TreeSet and TreeMap classes implement these interfaces
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(a), (c), and (d) The key of a MapEntry cannot be changed since the key is used for locating the entry within the map There is no set() method The setValue() method is optional
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