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APPENDIX D
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(e) Instance tests in the scuddle() method use the reified type List< > All assignments in the main() method are type-safe
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(e), (f), (g), and (h) The correct answers all create arrays that have a component type that is reifiable, and the assignment types are compatible (a) Cannot instantiate a type parameter (b) Cannot create an array whose component type is a type parameter (c) Cannot create a generic array of List<T>, as List<T> is not reifiable type (d) Cannot create an array of a type parameter (i) Unchecked assignment conversion warning, as the assignment is from a nongeneric type to a generic type
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(c) Erasure of E[] in the method copy() is Object[] The array type Object[] is actually cast to Object[] at runtime, ie, an identity cast The method copy() returns an array of Object In the main() method, the assignment of this array to an array of Strings results in a ClassCastException
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(e) The method header in (1) is valid The type of the varargs parameter can be generic The type of the formal parameter aols is an array of Lists of T The method prints each list The main() method in (2) can be declared as String, as it is equivalent to String[] The statement at (3) creates an array of Lists of Strings The type parameter T is inferred to be String in the method call in (4)
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15 Collections and Maps
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151 (b) and (d) It is recommended that (a) is fulfilled, but it is not a requirement (c) is also not required, but such objects will lead to collisions in the hash table, as they will map to the same bucket 152 (a), (b), (d), and (h) (c) is eliminated since the hashCode() method cannot claim inequality if the equals() method claims equality (e) and (f) are eliminated since the equals() method must
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APPENDIX D
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be reflexive, and (g) is eliminated since the hashCode() method must consistently return the same hash value during the execution 153 (b), (d), and (e) (a) and (c) fail to satisfy the properties of an equivalence relation (a) is not transitive and (c) is not symmetric 154 (a) and (e) (b) is not correct since it will throw an ArithmeticException when called on a newly created Measurement object (c) and (d) are not correct since they may return unequal hash values for two objects that are equal according to the equals() method 156 (a), (d), and (e)
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Set, Collection, and Map are core interfaces in the collections framework LinkedList is a class that implements the List interface There is no class or interface named Bag
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(b) and (e) The javautil package provides map implementations named HashMap and TreeMap It does not provide any implementations named HashList, ArraySet, and ArrayMap
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(d) The List interface is implemented by collections that maintain sequences of possibly non-unique elements Elements retain their insertion ordering in the sequence Collection classes implementing SortedSet only allow unique elements that are maintained in a sorted order
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(a), (c), and (f) Only methods in (a), (c), and (f) are in the Iterator<E> interface
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(a), (b), (c), (d), and (g) With blanks filled in:
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Collection<Integer> myItems = new ArrayList<Integer>(); myItemsadd(9); myItemsadd(1); myItemsadd(1); Iterator<Integer> iterator = myItemsiterator(); while (iteratorhasNext()) { Systemoutprint(iteratornext()); }
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(a) The expression in the for(:) loop header (in this case, the call to the makeCollection() method) is only evaluated once
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APPENDIX D
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(a), (b), and (c) Changing the value of the variable does not affect the data structure being iterated over The for(:) loop cannot run backwards We cannot iterate over several data structures simultaneously in a for(:) loop The syntax does not allow it
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(b) A String is immutable The call to the toUpperCase() method returns a new String object whose text representation is printed The elements of the collection remain unchanged
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(c) and (d) The for(:) loop does not allow the list to be modified structurally In (a) and (b), the code will throw a javautilConcurrentModificationException Note that the iterator in (d) is less restrictive than the for(:) loop, allowing elements to be removed in a controlled way
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(b), (c), (f), and (i) In (b), (c), and (f), the array type returned by the toArray() method is not a subtype of the array type on the left-hand side, resulting in a compile-time error The program will throw an ArrayStoreException in (i), because Integer objects cannot be stored in an array of type Long
(a) and (c) Some operations on a collection may throw an UnsupportedOperationException This exception type is unchecked, and the code is not required to explicitly handle unchecked exceptions A List allows duplicate elements An ArrayList implements a resizable array The capacity of the array will be expanded automatically when needed The List interface defines a get() method, but there is no method by that name in the Collection interface
(d) The program will compile without error, and will print all primes below 25 when run All the collection implementations used in the program implement the Collection interface The implementation instances are interchangeable when denoted by Collection references None of the operations performed on the implementations will throw an UnsupportedOperationException The program finds the primes below 25 by removing all values divisible by 2, 3, and 5 from the set of values from 2 through 25
(a), (b), and (d) The methods add(), retainAll(), and iterator() are defined in the Collection interface The get() and indexOf() methods are defined in the List interface