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from hashCode(). D is incorrect because hashCode() will often return == even if the two objects do not evaluate to equals() being true.
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2. C. The so-called hashing algorithm implemented by class Test1 will always return the same value, 42, which is legal but which will place all of the hash table entries into a single bucket, the most inefficient setup possible. A and D are incorrect because these classes are legal. B and E are incorrect based on the logic described above. 3. A and D. A is a restatement of the equals() and hashCode() contract. D is true because if the hashCode() comparison returns ==, the two objects might or might not be equal. B, C, and E are incorrect. B and C are incorrect because the hashCode() method is very flexible in its return values, and often two dissimilar objects can return the same hash code value. E is a negation of the hashCode() and equals() contract. 4. C. java.lang.StringBuffer is the only class in the list that uses the default methods provided by class Object. A, C, D, E, and F are incorrect based on the logic described above. 5. C and E are correct. A, B, and D are incorrect. A and B are incorrect because by contract hashCode() and equals() can t be overridden unless both are overridden. D is incorrect; hashCode() will often return the same value when hashing dissimilar objects.
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6. D. All of the collection classes allow you to grow or shrink the size of your collection. ArrayList provides an index to its elements. The newer collection classes tend not to have synchronized methods. Vector is an older implementation of ArrayList functionality and has synchronized methods; it is slower than ArrayList. A, B, C, and E are incorrect based on the logic described above; C, List is an interface. 7. E. Hashtable is the only class listed that provides synchronized methods. If you need synchronization great; otherwise, use HashMap, it s faster. A, B, C, and D are incorrect based on the logic described above. 8. C. TreeSet assures no duplicate entries; also, when it is accessed it will return elements in natural order, which typically means alphabetical. A, B, D, E, and F are incorrect based on the logic described above.
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9. B. LinkedHashMap is the collection class used for caching purposes. FIFO is another way to indicate caching behavior. To retrieve LinkedHashMap elements in cached order, use the values() method and iterate over the resultant collection. A, C, D, E, and E are incorrect based on the logic described above.
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10. B. By the time line 6 has run, the only object without a reference is the one generated as a result of line 4. Remember that Java is pass by value, so the reference variable x is not affected by the m1() method. A, C, D, and E are incorrect based on the logic described above. 11. D. All objects are placed in the garbage collectible heap. A is incorrect because the garbage collector makes no guarantees. B is incorrect because islands of isolated objects can exist. C is incorrect because finalize() has no such mystical powers. E is incorrect because within a finalize() method, an object s reference can be passed back to a live thread. 12. C. This is an example of the islands of isolated objects. By the time line 9 has run, the objects instantiated in lines 4 and 5 are referring to each other, but no live thread can reach either of them. A, B, D, and E are incorrect based on the logic described above. 13. C. This is a great way to think about when objects can be garbage collected. A and B assume guarantees that the garbage collector never makes. D is wrong because of the now famous islands of isolation scenario. 14. C and E. By the time line 18 is reached, x2 is null, x3 and x4 refer to the object created in line 12, and x5 refers to the object created in line 13. Any kind of redirection of x5 will leave the second object without a reference. A, B, and D are incorrect because the first object has two references; changing one of the references will not cause the first object to become unreachable. 15. E is correct. A copy of a reference to the line 13 object is passed to the doStuff2() method. We don t know what goes on in that method; it s possible that the reference is passed to other live objects. A, B, C, and D are incorrect based on the logic described above.
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