14: GENERICS in Java

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CHAPTER 14: GENERICS
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(c) The program will compile without any unchecked warnings When run, it will throw an exception (d) The program will compile, but issue unchecked warnings It will run with no output and terminate normally (e) The program will compile, but issue unchecked warnings When run, it will throw an exception 1435 What will be printed when the program is compiled and run
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public class InstanceTest2 { public static void main(String[] args) { List<Integer> intList = new ArrayList<Integer>(); Set<Double> doubleSet = new HashSet<Double>(); List< > list = intList; Set< > set = doubleSet; scuddle(intList); scuddle(doubleSet); scuddle(list); scuddle(set); } private static void scuddle(Collection< > col) { if (col instanceof List< >) { Systemoutprintln("I am a list"); } else if (col instanceof Set< >) { Systemoutprintln("I am a set"); } } }
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Select the one correct answer (a) The method scuddle() will not compile (b) The method main() will not compile (c) The program will compile, but issue an unchecked warning in method scuddle() It will run and terminate normally with the following output:
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I I I I am am am am a a a a list set list set
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(d) The program will compile, but issue an unchecked warning in the method main() When run, it will throw an exception (e) The program will compile without any unchecked warnings It will run and terminate normally, with the following output:
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I I I I am am am am a a a a list set list set
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(f) The program will compile without any unchecked warnings It will run and terminate normally, with the following output:
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I am a list I am a set
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(g) None of the above
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1413: LIMITATIONS AND RESTRICTIONS ON GENERIC TYPES
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Which statements will compile without errors and unchecked warnings when inserted at (1)
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public class Restrictions<T> { public void test() { // (1) INSERT ASSIGNMENT HERE } }
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Select the four correct answers (a) T ref = new T(); (b) T[] arrayRef = new T[10]; (c) List<T>[] arrayOfLists0 = { new List<T>(), new List<T>() }; (d) List<T>[] arrayOfLists1 = new List<T>[10]; (e) List< >[] arrayOfLists2 = new List< >[10]; (f) List [] arrayOfLists3 = new List< >[10]; (g) List< >[] arrayOfLists4 = new List[10]; (h) List [] arrayOfLists5 = new List[10]; (i) List<String>[] arrayOfLists6 = new List[10]; 1437 What will be printed when the program is compiled and run
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public class GenArrays { public static <E> E[] copy(E[] srcArray) { E[] destArray = (E[]) new Object[srcArraylength]; int i = 0; for (E element : srcArray) { destArray[i++] = element; } return destArray; } public static void main(String[] args) { String[] sa = {"9", "1", "1" }; String[] da = GenArrayscopy(sa); Systemoutprintln(da[0]); } }
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Select the one correct answer (a) The program will not compile (b) The program will compile, but issue an unchecked warning When run, it will print "9" (c) The program will compile, but issue an unchecked warning When run, it will throw an exception (d) The program will compile without any unchecked warnings When run, it will print "9" (e) The program will compile without any unchecked warnings When run, it will throw an exception
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CHAPTER 14: GENERICS
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What is the result of compiling and running the following program
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import javautilArrays; import javautilList; public class GenVarArgs { public static <T> void doIt(List<T> aols) { for(int i = 0; i < aolslength; i++) { Systemoutprint(aols[i] + " "); } } public static void main(String args) { List<String> ls1 = ArraysasList("one", "two"); List<String> ls2 = ArraysasList("three", "four"); List<String>[] aols = new List[] {ls1, ls2}; doIt(aols); } }
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// (1)
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// (2)
// (3) // (4)
Select the one correct answer (a) (b) (c) (d) (e) The program does not compile because of errors in (1) The program does not compile because of errors in (2) The program does not compile because of errors in (3) The program does not compile because of errors in (4) The program compiles and prints: [one, two] [three, four]
Summary
The following information was included in this chapter: how generic types, parameterized types, and raw types are related declaring generic types (classes and interfaces) and parameterized types extending generic types mixing generic code and legacy code the significance of unchecked warnings on type-safety understanding subtype relationships for wildcards understanding type hierarchy for wildcard parameterized types understanding widening and narrowing reference conversions in type hierarchy of wildcard parameterized types understanding restrictions on set and get operations when using references of wildcard parameterized types using bounded type parameters how to implement a generic class that is also Iterable