Java - What is the Collection?

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What is the Collection?

Total Answers and Comments: 2

Last Update: April 12, 2006 Asked by: suresh

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March 03, 2006 03:05:06

mohan

RE: What is the Collection?

Collection is a framework. Which is added in java2.

It provides some interfaces abstract classes classes and algorithms.

Here algorithms are static methods.

Collection is an interface in Collections framework.

It has some methods like add() addAll() remove() and clear()....

Most of the classess implements the Collection interface

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April 12, 2006 04:23:23

MP3DJAY

Member Since: April 2006 Contribution: 1

RE: What is the Collection?

Collection InterfacesThere are six collection interfaces. The most basic interface is Collection. Three interfaces extend Collection: Set List and SortedSet. The other two collection interfaces Map and SortedMap do not extend Collection as they represent mappings rather than true collections. However these interfaces contain collection-view operations which allow them to be manipulated as collections.All of the modification methods in the collection interfaces are labeled optional. Some implementations may not perform one or more of these operations throwing a runtime exception (UnsupportedOperationException) if they are attempted. Implementations must specify in their documentation which optional operations they support. Several terms are introduced to aid in this specification: * Collections that do not support any modification operations (such as add remove and clear) are referred to as unmodifiable. Collections that are not unmodifiable are referred to modifiable. * Collections that additionally guarantee that no change in the Collection object will ever be visible are referred to as immutable. Collections that are not immutable are referred to as mutable. * Lists that guarantee that their size remains constant even though the elements may change are referred to as fixed-size. Lists that are not fixed-size are referred to as variable-size. * Lists that support fast (generally constant time) indexed element access are known as random access lists. Lists that do not support fast indexed element access are known as sequential access lists. The RandomAccess marker interface is provided to allow lists to advertise the fact that they support random access. This allows generic algorithms to alter their behavior to provide good performance when applied to either random or sequential access lists.Some implementations may restrict what elements (or in the case of Maps keys and values) may be stored. Possible restrictions include requiring elements to: * Be of a particular type. * Be non-null. * Obey some arbitrary predicate.Attempting to add an element that violates an implementation's restrictions results in a runtime exception typically a ClassCastException an IllegalArgumentException or a NullPointerException. Attempting to remove or test for the presence of an element that violates an implementation's restrictions may result in an exception though some restricted collections may permit this usage.mp3 djay

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