15: COLLECTIONS AND MAPS in Java

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CHAPTER 15: COLLECTIONS AND MAPS
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Which of these implementations are provided by the javautil package Select the two correct answers (a) HashList<E> (b) HashMap<K,V> (c) ArraySet<E> (d) ArrayMap<K,V> (e) TreeMap<K,V>
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What is the name of the interface used to represent collections that maintain nonunique elements in order Select the one correct answer (a) Collection<E> (b) Set<E> (c) SortedSet<E> (d) List<E> (e) Sequence<E>
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Which methods are specified by the Iterator<E> interface Select the three correct answers (a) hasNext() (b) hasMore() (c) remove() (d) delete() (e) more() (f) next()
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Which identifiers, when inserted in appropriate places in the program, will result in the output 911
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Collection<________> myItems = new ArrayList<__________>(); myItemsadd(9); myItemsadd(1); myItemsadd(1); Iterator<_________> iterator = _____________iterator(); while (_________________________()) { Systemoutprint(______________________()); }
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Select the five correct answers (a) hasNext (b) myItems (c) next (d) Integer (e) int (f) Collection (g) iterator
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153: COLLECTIONS
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What will the program print when it is compiled and run
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import javautilArrayList; import javautilCollection; public class RQ400_100 { public static void main(String[] args) { int sum = 0; for (int i : makeCollection()) sum += i; Systemoutprintln(sum); } static Collection<Integer> makeCollection() { Systemoutprintln("A collection coming up"); Collection<Integer> collection = new ArrayList<Integer>(); collectionadd(10); collectionadd(20); collectionadd(30); return collection; } }
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Select the one correct answer (a) A collection coming up
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(b) A collection coming up
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A collection coming up A collection coming up 60
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(c) The program does not compile (d) None of the above 1512 Which statements are true about the for(:) loop:
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for (type variable : expression) statement
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Select the three correct answers (a) (b) (c) (d) The variable is only visible in the for(:) loop body The expression is only evaluated once The type of the expression must be javalangIterable or an array type Changing the value of the variable in the loop body affects the data structure represented by the expression (e) The loop runs backwards if the expression is negated as follows: !expression (f) We can iterate over several data structures simultaneously in a for(:) loop What will the program print when compiled and run
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import javautilArrayList; import javautilCollection; public class IterateOverCollection2 { public static void main(String[] args) { Collection<String> words = new ArrayList<String>();
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CHAPTER 15: COLLECTIONS AND MAPS wordsadd("Don't"); wordsadd("change"); wordsadd("me!"); Systemoutprintln("Before: " + words); for (String word : words) { Systemoutprint(wordtoUpperCase() + "_"); } Systemoutprintln(); Systemoutprintln("After: " + words); } }
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Select the one correct answer (a) Before: [Don't, change, me!]
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DON'T_CHANGE_ME!_ After: [DON'T, CHANGE, ME!]
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(b) Before: [Don't, change, me!]
DON'T_CHANGE_ME!_ After: [Don't, change, me!]
(c) The program will throw a javautilConcurrentModificationException, when run (d) The program fails to compile 1514 Which code, when inserted at (1), will result in the following output:
Before: [Apple, Orange, Apple] After: [Orange]
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import javautilArrayList; import javautilIterator; import javautilList; class Fruity { private String fName; Fruity(String fName) { thisfName = fName; } public void setName(String newName) { thisfName = newName; } public String toString() { return fName; } public boolean equals(Object other) { if (this == other) return true; if (!(other instanceof Fruity)) return false; return fNameequalsIgnoreCase(((Fruity)other)fName); } } public class RQ400_50 { public static void main(String[] args) { Fruity apple = new Fruity("Apple"); Fruity orange = new Fruity("Orange"); List<Fruity> list = new ArrayList<Fruity>(); listadd(apple); listadd(orange); listadd(apple); Systemoutprintln("Before: " + list); // (1) INSERT CODE HERE Systemoutprintln("After: " + list); } }
153: COLLECTIONS
Select the two correct answers (a) for (Fruity f : list) {
if (fequals(apple)) listremove(f); }
(b) int i = 0;
for (Fruity f : list) { if (fequals(apple)) listremove(i); i++; }
(c) for (int j = 0; j < listsize(); j++) {
Fruity f = listget(j); if (fequals(apple)) listremove(j); }
(d) Iterator<Fruity> itr = listiterator();
while (itrhasNext()) { Fruity f = itrnext(); if (fequals(apple)) itrremove(); }
Which statement, when inserted independently at (1), will cause either a compiletime or a runtime error
import javautilArrayList; import javautilCollection; public class RQ400_200 { public static void main(String[] args) { Collection<Integer> intList = new ArrayList<Integer>(); intListadd(2008); intListadd(2009); intListadd(2010); // (1) INSERT STATEMENT HERE! } }
Select the four correct answers (a) Object[] objArray1 = intListtoArray(); (b) Integer[] intArray1 = intListtoArray(); (c) Number[] numArray1 = intListtoArray(); (d) Object[] objArray2 = intListtoArray(new Object[0]); (e) Integer[] intArray2 = intListtoArray(new Integer[0]); (f) Integer[] intArray3 = intListtoArray(new Number[0]); (g) Number[] numArray2 = intListtoArray(new Number[0]); (h) Number[] numArray3 = intListtoArray(new Integer[0]); (i) Number[] numArray4 = intListtoArray(new Long[0]);