vb.net print barcode zebra public interface Map<K,V> in Java

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public interface Map<K,V>
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Its type parameters are the key type K and the value type V. The type Map<String,Country> could be used for the records in Table 4.3, using the String class for K and a Country class for V. (See page 74.) The Map interface is shown in Figure 4.11 on page 94. It specifies 14 methods. Note that this interface does not extend the Collection interface. (See Figure 4.1 on page 70.) Sets, lists, and queues are collections of individual elements, which are not key-value pairs. The two subinterfaces and five implementing classes of the Map interface are analogous to the corresponding subinterfaces and implementing classes of the Set interface. Like the AbstractSet class, the AbstractMap class implements only those methods that are either independent of the underlying data structure or can be implemented using the other methods. Like the EnumSet, HashSet, LinkedHashSet, and TreeSet classes, the EnumMap, HashMap, LinkedHashMap, and TreeMap implement the abstract methods. The EnumMap class is defined like this:
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public class EnumMap<K extends Enum<K>,V> extends AbstractMap<K,V>
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The expression K extends Enum<K> means that only enum types can be used for the key type K. EXAMPLE 4.14 Using the EnumMap Class
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public class TestEnumMap { public static void main(String[] args) { Map<EuCodes,Country> eu = new EnumMap<EuCodes,Country>(EuCodes.class); eu.put(EuCodes.AT, new Country("Austria","German",83870,8192880,40.9)); eu.put(EuCodes.PL, new Country("Poland","Polish",312685,38536869,37.0)); eu.put(EuCodes.FR, new Country("France","French",547030,60876136,39.1)); System.out.println(eu.size()); System.out.println(eu.keySet()); System.out.println(eu.get(EuCodes.PL)); } } enum EuCodes { AM, AT, BY, BE, BG, HR, CY, CZ, DK, EE, FI, FR, GE, DE, GR, HU, IS, IE, IT, LV, LI, LT, LU, MK, MT, MD, MC, NL, NO, PL, PT, RO, RU, SK, SI, ES, SE, CH, TR, UA, GB, VA } class Country { private String name; private String language;
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THE JAVA COLLECTIONS FRAMEWORK
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private int area; private int population; private double avAge; Country(String name, String lang, int area, int pop, double avAge) { this.name = name; this.language = lang; this.area = area; this.population = pop; this.avAge = avAge; }
Figure 4.11 The java.util.Map interface
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public String toString() { return "[" + name + ": " + language + ", " + area + ", " + population + ", " + avAge + "]"; } }
The output is:
3 [AT, FR, PL] [Poland: Polish, 312685, 38536869, 37.0] The program uses two other classes: EuCodes at lines 13 15, and Country at lines 17 36. These are the type arguments for the type parameters K and V at line 3. Three key-value pairs are inserted at lines 3 6. The size(), keySet(), and get() methods are tested at lines 7 9. The get() method illustrates the look-up table nature of a map: the call eu.get(EuCodes.PL) looks up the record (the value ) for the key EuCodes.PL and returns it as: [Poland: Polish, 312685, 38536869, 37.0]
The JCF implements four extensions of the AbstractMap class: the EnumMap class, the HashMap class, the LinkedHashMap class, and the TreeMap class. Their distinctions are the same as the distinctions among the corresponding four extensions of the AbstractSet class. The HashMap class allows any class to be the key type. Its LinkedHashMap extension maintains a doubly linked list of all its elements, allowing ordered key access according the order of insertion. The TreeMap class allows ordered key access according to either the key type s natural order or a Comparator object passed to its constructor. THE Arrays CLASS The java.util.Arrays class contains static methods for processing arrays, including methods for converting arrays to collections and vice versa. The class is briefly outlined on page 29. Most of the methods in the Arrays class are overloaded with separate versions for the generic array type T[] and for each of the nine specific array types: boolean[], byte[], char[], double[], float[], int[], long[], Object[], and short[]. In addition, most of these have a separate version for a subarray. For example, here are the 18 overloaded versions of the sort() method:
void void void void void void void void void void void void void void sort(boolean[] a) sort(boolean[] a, int fromIndex, int toIndex) sort(byte[] a) sort(byte[] a, int fromIndex, int toIndex) sort(c[] a) sort(byte[] a, int fromIndex, int toIndex) sort(double[] a) sort(double[] a, int fromIndex, int toIndex) sort(int[] a) sort(int[] a, int fromIndex, int toIndex) sort(float[] a) sort(float[] a, int fromIndex, int toIndex) sort(long[] a) sort(long[] a, int fromIndex, int toIndex)
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