15: COLLECTIONS AND MAPS in Java

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CHAPTER 15: COLLECTIONS AND MAPS
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Select the three correct answers (a) return a == oa || b == ob; (b) return false; (c) return a >= oa; (d) return a == oa; (e) return a == oa && b == ob; 154 Which code, when inserted at (1), will provide a correct implementation of the
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hashCode() method in the following program
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import javautil*; public class Measurement { int count; int accumulated; public Measurement() {} public void record(int v) { count++; accumulated += v; } public int average() { return accumulated/count; } public boolean equals(Object other) { if (this == other) return true; if (!(other instanceof Measurement)) return false; Measurement o = (Measurement) other; if (count != 0 && ocount != 0) return average() == oaverage(); return count == ocount; } public int hashCode() { // (1) INSERT CODE HERE } }
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Select the two correct answers (a) return 31337; (b) return accumulated / count; (c) return (count << 16) ^ accumulated; (d) return ~accumulated; (e) return count == 0 0 : average(); 155 What will be the result of compiling and running the following program
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import javautilComparator; class Person implements Comparable<Person> { String name; int age; Person(String name, int age) { thisname = name; thisage = age; }
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152: THE JAVA COLLECTIONS FRAMEWORK public int compareTo(Person p2) { Comparator<String> strCmp = Personcmp(); int status = strCmpcompare(thisname, p2name); if (status == 0) { Comparator<Integer> intCmp = Personcmp(); status = intCmpcompare(thisage, p2age); } return status; } public static <E extends Comparable<E>> Comparator<E> cmp() { return new Comparator<E>() { public int compare(E s1, E s2) { return s2compareTo(s1); } }; } public static void main(String[] args) { Person p1 = new Person("Tom", 20); Person p2 = new Person("Dick", 30); Person p3 = new Person("Tom", 40); Systemoutprintln((p1compareTo(p2) < 0) + " " + (p1compareTo(p3) < 0)); } }
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Select the one correct answer (a) (b) (c) (d) (e) (f) The program will fail to compile The program will compile but throw an exception when run The program will compile and print true false, when run The program will compile and print true true, when run The program will compile and print false false, when run The program will compile and print false true, when run
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152 The Java Collections Framework
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A collection allows a group of objects to be treated as a single unit Objects can be stored, retrieved, and manipulated as elements of a collection Arrays are an example of one kind of collection Program design often requires the handling of collections of objects The Java Collections Framework provides a set of standard utility classes for managing various kinds of collections The core framework is provided in the javautil package and comprises three main parts: The core interfaces that allow collections to be manipulated independently of their implementation (see Figure 151 and Table 151) These generic interfaces define the common functionality exhibited by collections and facilitate data exchange between collections
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CHAPTER 15: COLLECTIONS AND MAPS
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A set of implementations (ie, concrete classes, listed in Table 151) that are specific implementations of the core interfaces, providing data structures that a program can readily use An assortment of static utility methods found in the Collections and Arrays classes that can be used to perform various operations on collections and arrays, such as sorting and searching, or creating customized collections (see Section 1511, Working with Collections )
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The Core Interfaces
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interface javalangIterable<E>
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interface Collection<E>
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interface List<E>
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interface Queue<E>
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interface Set<E>
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interface Map<K,V>
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interface Deque<E>
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interface SortedSet<E>
interface SortedMap<K,V>
interface NavigableSet<E> (a)
interface NavigableMap<K,V> (b)
Core Interfaces
The generic Collection interface is a generalized interface for maintaining collections and is the root of the interface inheritance hierarchy for collections shown in Figure 151a These subinterfaces are summarized in Table 151 The Collection interface extends the Iterable interface that specifies an iterator to sequentially access the elements of an Iterable object (see subsection Iterators, p 785)