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javatextNumberFormat javautilNumberFormat javatextLocale javautilLocale NumberFormatgetNumberInstance NumberFormatgetCurrencyInstance DateFormatgetInstance new NumberFormat dformat(f) fformat(d) NumberFormat DateFormat Format
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LocaleUS DateFormatDOUBLE NumberFormatUS
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fformatNumber(d) NumberFormatformat(d)
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APPENDIX F
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Given the following program:
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import javautilArrays; public class Q500_100 { public static void main(String[] args) { String[] tokens = ___(1)___split(___(2)___); Systemoutprintln(ArraystoString(tokens)); } }
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Which pair of strings, when inserted at (1) and (2), respectively, will result in the following output:
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[, mybook, mychapter, , mysection]
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Select the two correct answers (a) "\mybook\mychapter\\mysection", "\\" (b) "\\mybook\\mychapter\\\mysection", "\\\" (c) "\\mybook\\mychapter\\\\mysection\\", "\\\\" (d) "\\mybook\\mychapter\\\\mysection\\\\", "\\\\" (e) "\\mybook\\mychapter\\mysection", "\\" (f) The program will not compile, regardless of which alternative from (a) to (e) is inserted (g) The program will throw an exception when run, regardless of which alternative from (a) to (e) is inserted Q71 Given the following code:
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public class Q600_30 { public static void main(String[] args) { // (1) INSERT STATEMENT HERE } }
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Which statements, when inserted at (1), will print the following:
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|false|
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Select the six correct answers (a) Systemoutprintf("|%-4b|", false); (b) Systemoutprintf("|%5b|", false); (c) Systemoutprintf("|%5b|", false); (d) Systemoutprintf("|%4b|", "false"); (e) Systemoutprintf("|%3b|", 123); (f) Systemoutprintf("|%b|", 12345); (g) Systemoutprintf("|%5b|", new Boolean("911")); (h) Systemoutprintf("|%2b|", new Integer(2007)); (i) Systemoutprintf("|%1b|", (Object[])null); (j) Systemoutprintf("|%1b|", (Object)null); (k) Systemoutprintf("|%3$b|", null, 123, true);
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APPENDIX F
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Which statements are true about the classes SupA, SubB and SubC :
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class SupA<T> { public List< > fuddle() { return null; } public List scuddle(T t) { return null; } } class SubB<U> extends SupA<U> { public List fuddle() { return null;} public List< > scuddle(U t) { return null; } } class SubC<V> extends SupA<V> { public List<V> fuddle() { return null;} public List< extends Object> scuddle(V t) { return null; } }
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Select the four correct answers (a) (b) (c) (d) (e) (f) (g) (h) Class SubB will not compile Class SubC will not compile Class SubB will compile Class SubC will compile Class SubB overloads the methods in class SupA Class SubC overloads the methods in class SupA Class SubB overrides the methods in class SupA Class SubC overrides the methods in class SupA
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Annotated Answers
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Q1 (a), (b), (c), and (e) Only local variables need to be explicitly initialized before use Fields are assigned a default value if not explicitly initialized (d) A try block must be followed by at least one catch or finally block No catch blocks can follow a finally block Methods need not declare that they can throw Runtime Exceptions, as these are unchecked exceptions (e) Giving parameters (2, 3) to the method substring() constructs a string consisting of the characters between positions 2 and 3 of the original string The positions are indexed in the following manner: position 0 is immediately before the first character of the string, position 1 is between the first and the second character, position 2 is between the second and the third character, and so on (a) A Thread object executes the run() method of a Runnable object on a separate thread when started A Runnable object can be given when constructing a Thread object If no Runnable object is supplied, the Thread object (which implements the Runnable
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APPENDIX F
interface) will execute its own run() method A thread is initiated using the start() method of the Thread object Q5 (a), (b), (c) First, note that nested packages or nested static members are not automatically imported In (d), p2DefenceInDepth is not a static member and therefore cannot be imported statically With (e), MarchLEFT becomes ambiguous because both the second and the third import statement statically import March The enum constant LEFT cannot be resolved either, as its enum type March cannot be resolved With (f), the enum constant LEFT cannot be resolved, as none of the static import statements specify it The enum type p2March is also not visible outside the package Q6 Q7 (c) The loop prints out the values 12, 9, 6, and 3 before terminating (e) The fact that a field is static does not mean that it is not accessible from non-static methods and constructors All fields are assigned a default value if no initializer is supplied Local variables must be explicitly initialized before use (e) All the "hello" literals denote the same String object Any String object created using the new operator will be a distinct new object (a) Calls to the methods suspend(), sleep(), and wait() do not stop a thread They only cause a thread to move out of its running state A thread will terminate when the execution of the run() method has completed (b), (d) (a) The class need not be declared as a generic type if it defines any generic methods (b) The method choose(T, T), where T extends Comparable<T>, is not applicable to the arguments (Integer, String) Note that Object is not Comparable<Object> (c) The method choose(T, T), where T extends Comparable<T>, is not applicable to the arguments (Integer, Double) Note that Number is not Comparable<Number> (d) The actual type parameter Double specified in the method call also requires that the int argument is cast to a double in order for the call to be valid The method choose(T, T), where T extends Comparable<T>, is then applicable to the argument list (Double, Double) (e) Cannot convert the Double returned by the method to an int using a cast (f) The method returns a Double which is first converted to a double, which in turn is converted to an int