map : Java Glossary

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map

Map has two meanings, tools for navigating on planet earth and tools to let you lookup Objects by key.

Geographical Maps

Java Maps

In Java, java.util.Map is the interface that Collections implement when they are capable of looking something up by unique key.

Many classes implement it including: AbstractMap, Attributes, AuthProvider, ConcurrentHashMap, EnumMap, HashMap, Hashtable, IdentityHashMap, LinkedHashMap, PrinterStateReasons, Properties, Provider, RenderingHints, TabularDataSupport, TreeMap, UIDefaults and WeakHashMap.

All Maps support put( key, value) and get( key).

Note that Collections that look up by an int index such as ArrayList and Vector are not considered Maps. They are Lists.

Learning More

Oracle’s Javadoc on Map interface : available:
Oracle’s Javadoc on Collections.unmodifiableMap : available:
Oracle’s Javadoc on Collections.emptyMap() : available:
GlobeExporer.com
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WorldMapper: maps of all manner of statistics done by distorting the size of countries
Yahoo

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