Java Reference
In-Depth Information
Display 16.8
The Map Landscape
Map<K,V>
SortedMap<K,V>
AbstractMap<K,V>
TreeMap<K,V>
HashMap<K,V>
Interface
A single line between two boxes means
the lower class or interface is derived from
(extends) the higher one.
K
and
V
are type parameters for the type of
the keys and elements stored in the map.
Abstract Class
Concrete Class
Display 16.9
Method Headings in the
Map<K,V>
Interface
(part 1 of 3)
The
Map<K,V>
interface is in the
java.util
package.
CONSTRUCTORS
Although not officially required by the interface, any class that implements the
Map<K,V>
interface
should have at least two constructors: a no-argument constructor that creates an empty
Map<K,V>
object, and a constructor with one
Map<K,V>
parameter that creates a
Map<K,V>
object with the
same elements as the constructor argument. The interface does not specify whether the copy
produced by the one-argument constructor is a shallow copy or a deep copy of its argument.
