February 2014
Beginner
1248 pages
62h 25m
English
Content preview from Java™ How To Program (Early Objects), Tenth Edition
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Section 16.11 Maps
• Maps (p. 714) store key–value pairs and cannot contain duplicate keys. HashMaps (p. 714) and Hashtables (p. 714) store elements in a hash table, and TreeMaps (p. 714) store elements in a tree.
• HashMap takes two type arguments—the type of key and the type of value.
• HashMap method put (p. 717) adds a key–value pair to a HashMap. Method get (p. 717) locates the value associated with the specified key. Method isEmpty (p. 718) determines if the map is empty.
• HashMap method keySet (p. 718) returns a set of the keys. Map method size (p. 718) returns the number of key–value pairs in the Map.
• Interface SortedMap (p. 714) extends Map and represents a map that maintains its keys in sorted order. Class TreeMap implements SortedMap ...
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