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(b) static <E extends CharSequence> List<E>
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(c) static <E extends CharSequence> Collection<E>
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(d) static <E extends CharSequence> List<E>
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CHAPTER 14: GENERICS
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(e) static <E extends CharSequence> Collection<E>
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(f) public <E super CharSequence> Collection<E>
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Which declaration can be inserted at (1) so that the program compiles and runs without errors
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public class RQ100_06 { public static void main(String[] args) { // (1) INSERT DECLARATION HERE for (int i = 0; i <= 5; i++) { List<Integer> row = new ArrayList<Integer>(); for (int j = 0; j <= i; j++) rowadd(i * j); dsadd(row); } for (List<Integer> row : ds) Systemoutprintln(row); } }
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Select the one correct answer (a) List<List<Integer>> ds = new List<List<Integer>>(); (b) List<ArrayList<Integer>> ds = new ArrayList<ArrayList<Integer>>(); (c) List<List<Integer>> ds = new ArrayList<List<Integer>>(); (d) ArrayList<ArrayList<Integer>> ds = new ArrayList<ArrayList<Integer>>(); (e) List<List<Integer>> ds = new ArrayList<ArrayList<Integer>>(); (f) List<List, Integer> ds = new List<List, Integer>(); (g) List<List, Integer> ds = new ArrayList<List, Integer>(); (h) List<List, Integer> ds = new ArrayList<ArrayList, Integer>(); 1423 Which method declarations cannot be inserted independently at (2) to overload the method at (1)
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public class RQ_Overloading { static <T> void overloadMe(List<T> s1, List<T> s2) { } // (1) // (2) INSERT DECLARATION HERE }
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Select the two correct answers (a) static <T> void overloadMe(Collection<T> s1, List<T> s2) { } (b) static <T> void overloadMe(List<T> s1, List< extends T> s2) { } (c) static <T> void overloadMe(List<T> s1, Collection< super T> s2) { } (d) static <T> void overloadMe(Collection<T> s1, Collection< super T> s2) { } (e) static <T> void overloadMe(Collection<T> s1, List< super T> s2) { } (f) static <T> void overloadMe(List< extends T> s1, List< super T> s2) { }
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1413: LIMITATIONS AND RESTRICTIONS ON GENERIC TYPES
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Which declarations can be inserted at (1) so that the program compiles and runs without errors
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public class RQ100_07 { public static void main(String[] args) { // (1) INSERT DECLARATION HERE appendAndPrint(lst, "hello"); } static <T> void appendAndPrint(Collection<T> ds, T t) { dsadd(t); Systemoutprintln(ds); } }
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Select the two correct answers (a) List< > lst = new LinkedList<Object>(); (b) List< extends Object> lst = new LinkedList<Object>(); (c) List< super Object> lst = new LinkedList<Object>(); (d) List<Object> lst = new LinkedList<Object>(); 1425 Which method declaration can be inserted at (1) so that the program compiles without warnings
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public class RQ100_87 { public static void main(String[] args) { List raw = new ArrayList(); rawadd("2007"); rawadd(2008); rawadd("2009"); justDoIt(raw); } // (1) INSERT METHOD DECLARATION HERE }
Select the one correct answer (a) static void justDoIt(List<Integer> lst) { } (b) static void justDoIt(List< > lst) { } (c) static <T> void justDoIt(List<T> lst) { } (d) None of the above 1426 Which method calls can be inserted at (1) so that the program compiles without warnings
public class GenParam { public static void main(String[] args) { List<Number> numList = new ArrayList<Number>(); List<Integer> intList = new ArrayList<Integer>(); // (1) INSERT CODE HERE } static <T> void move(List< extends T> lst1, List< super T> lst2) { } }
CHAPTER 14: GENERICS
Select the three correct answers (a) GenParammove(numList, intList); (b) GenParam<Number>move(numList, intList); (c) GenParam<Integer>move(numList, intList); (d) GenParammove(intList, numList); (e) GenParam<Number>move(intList, numList); (f) GenParam<Integer>move(intList, numList); 1427 Which statement is true about the following code
public class RQ100_86 { static void print1(List<String> lst) { for(String element : lst) { Systemoutprint(element + " "); } } static void print2(List<String> lst) { for(Object element : lst) { Systemoutprint(element + " "); } } static void print3(List< > lst) { for(Object element : lst) { Systemoutprint(element + " "); } } static <T> void print4(List<T> lst) { for(Object element : lst) { Systemoutprint(element + " "); } } static <T> void print5(List<T> lst) { for(T element : lst) { Systemoutprint(element + " "); } } } // (1)
// (2)
// (3)
// (4)
// (5)
Select the one correct answer (a) The formal type parameter specification for the methods in (1), (2), and (3) is missing (b) The generic methods in (4) and (5) should be declared in a generic class (c) The element type Object for the local variable element in the for(:) loop header of the method in (3) is inconsistent with the element type of the list (d) The element type Object for the local variable element in the for(:) loop header of the method in (4) is inconsistent with the element type of the list (e) The program will compile without warnings (f) None of the above