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APPENDIX F
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(e) An object of the class Extension is created The first thing the constructor of Extension does is invoke the constructor of Base, using an implicit super() call All calls to the method void add(int) are dynamically bound to the add() method in the Extension class, since the actual object is of type Extension Therefore, this method is called by the constructor of Base, the constructor of Extension, and the bogo() method with the parameters 1, 2, and 8, respectively The instance field i changes value accordingly: 2, 6, and 22 The final value of 22 is printed (d)
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TreeMap and HashSet do not maintain an ordered sequence of objects Vector and ArrayList require shifting of objects on insertion and deletion, while LinkedList
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does not When objects are frequently inserted and deleted from the middle of the sequence, LinkedList gives the best performance Q13 (a) and (d) Field b of the outer class is not shadowed by any local or inner class variables, therefore, (a) will work Using thisa will access the field a in the inner class Using thisb will result in a compilation error, since there is no field b in the inner class Using Q4a39thisa will successfully access the field of the outer class The statement c = c will only reassign the current value of the local variable c to itself (b), (c), (d) The class File does not have methods called found, isAFile, or isADirectory Q15 (d) At (1), a new String object is constructed by concatenating the string "bye" in the String object denoted by b and the string "!" After line (2), d and b are aliases After line (3), b and a are aliases, but d still denotes the String object with "bye" from line (0) After line (4), d and a are aliases Reference d no longer denotes the String object created in line (0) This String object has no references to it and is, therefore, a candidate for garbage collection (c) The regex in (c) requires a sequence of uppercase letters to be followed by a sequence of lowercase letters The other regexes are equivalent, as they require a sequence which can consist of upper and/or lower case letters, ie, any combination of letters Running the program with the regex in (c) will produce the following output:
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(5,6:Ja)(7,8:Va)
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Running the program with the other regexes will produce the following output:
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(0,3:JAVA)(5,8:JaVa)(10,13:java)(15,18:jaVA)
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String objects are immutable None of the methods of the String class modify a String object Methods toUpperCase() and replace() in the String class will return a
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APPENDIX F
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new String object that contains the modified string However, StringBuilder objects are mutable Q18 (e) The second parameter to the constructor specifies whether the file contents should be replaced or appended when the specified file already exists Q19 (c) Statement (a) will work just fine, and (b), (d), and (e) will cause compilation errors Statements (b) and (e) will cause compilation errors because they attempt to assign an incompatible type to the reference Statement (d) will cause compilation errors, since a cast from B to C is invalid Being an instance of B excludes the possibility of being an instance of C Statement (c) will compile, but will throw a runtime exception, since the object that is cast to B is not an instance of B (b), (c), (d), (g) In (a), a String is neither an array nor an Iterable In (e), the local variable str is redeclared In (f) the occurrence of the array operator [] is not permissible In (h), the String class does not have a method called toArray, but it has a method called toCharArray Q21 (e) The desired accessibility is package accessibility, which is the default accessibility for members that have no accessibility modifier The keyword package is not an accessibility modifier and cannot be used in this context (b) and (e) For the expression matrix[3][2] to access a valid element of a two-dimensional array, the array must have at least four rows and the fourth row must have at least three elements Fragment (a) produces a 2 3 array Fragment (c) tries to initialize a two-dimensional array as a one-dimensional array Fragment (d) tries to specify array dimensions in the type of the array reference declaration (c), (d) The pathname of the JAR file, together with the JAR file name, should be specified Q24 (a) The expression arrlength will evaluate to 4 The expression arr[1] will access the element { { "1", "2" }, { "1", null, "3" } }, and arr[1][2] will try to access the third sub-element of this element This produces an ArrayIndexOutOfBoundsException, since the element has only two sub-elements (c) and (d) String objects can have identical sequences of characters The == operator, when used on String object references, will just compare the references and will only return true when both references denote the same object (ie, are aliases) The equals() method will return true whenever the contents of the String objects are identical An array of char and a String are two totally different types and cannot be compared using the equals() method of the String class
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