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javautil Part 1: The Collections Framework
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// Deposit 1000 into John Doe's account double balance = tmget("John Doe"); tmput("John Doe", balance + 1000); Systemoutprintln("John Doe's new balance: " + tmget("John Doe")); } }
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The following is the output from this program: Jane Baker: 13780 John Doe: 343434 Ralph Smith: -1908 Todd Hall: 9922 Tom Smith: 12322 John Doe s current balance: 443434 Notice that TreeMap sorts the keys However, in this case, they are sorted by first name instead of last name You can alter this behavior by specifying a comparator when the map is created, as described shortly
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The LinkedHashMap Class
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LinkedHashMap extends HashMap It maintains a linked list of the entries in the map, in the order in which they were inserted This allows insertion-order iteration over the map That is, when iterating through a collection-view of a LinkedHashMap, the elements will be returned in the order in which they were inserted You can also create a LinkedHashMap that returns its elements in the order in which they were last accessed LinkedHashMap is a generic class that has this declaration: class LinkedHashMap<K, V> Here, K specifies the type of keys, and V specifies the type of values LinkedHashMap defines the following constructors: LinkedHashMap( ) LinkedHashMap(Map< extends K, extends V> m) LinkedHashMap(int capacity) LinkedHashMap(int capacity, float fillRatio) LinkedHashMap(int capacity, float fillRatio, boolean Order) The first form constructs a default LinkedHashMap The second form initializes the LinkedHashMap with the elements from m The third form initializes the capacity The fourth form initializes both capacity and fill ratio The meaning of capacity and fill ratio are the same as for HashMap The default capactiy is 16 The default ratio is 075 The last form allows you to specify whether the elements will be stored in the linked list by insertion order, or by order of last access If Order is true, then access order is used If Order is false, then insertion order is used
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Part II:
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The Java Library
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LinkedHashMap adds only one method to those defined by HashMap This method is removeEldestEntry( ) and it is shown here: protected boolean removeEldestEntry(MapEntry<K, V> e) This method is called by put( ) and putAll( ) The oldest entry is passed in e By default, this method returns false and does nothing However, if you override this method, then you can have the LinkedHashMap remove the oldest entry in the map To do this, have your override return true To keep the oldest entry, return false
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The IdentityHashMap Class
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IdentityHashMap extends AbstractMap and implements the Map interface It is similar to HashMap except that it uses reference equality when comparing elements IdentityHashMap is a generic class that has this declaration: class IdentityHashMap<K, V> Here, K specifies the type of key, and V specifies the type of value The API documentation explicitly states that IdentityHashMap is not for general use
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The EnumMap Class
EnumMap extends AbstractMap and implements Map It is specifically for use with keys of an enum type It is a generic class that has this declaration: class EnumMap<K extends Enum<K>, V> Here, K specifies the type of key, and V specifies the type of value Notice that K must extend Enum<K>, which enforces the requirement that the keys must be of an enum type EnumMap defines the following constructors: EnumMap(Class<K> kType) EnumMap(Map<K, extends V> m) EnumMap(EnumMap<K, extends V> em) The first constructor creates an empty EnumMap of type kType The second creates an EnumMap map that contains the same entries as m The third creates an EnumMap initialized with the values in em EnumMap defines no methods of its own
Comparators
Both TreeSet and TreeMap store elements in sorted order However, it is the comparator that defines precisely what sorted order means By default, these classes store their elements by using what Java refers to as natural ordering, which is usually the ordering that you would expect (A before B, 1 before 2, and so forth) If you want to order elements a different way, then specify a Comparator when you construct the set or map Doing so gives you the ability to govern precisely how elements are stored within sorted collections and maps Comparator is a generic interface that has this declaration: interface Comparator<T> Here, T specifies the type of objects being compared
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