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Methods for accessing collection members by position.. An offset is an integer value that gives relative position of a member in the enumeration sequence of a collection. Offsets start the count of the first member at zero, just like C array indexing. Offsets provide an alternate means to access the members of a collection, without creating a separate index object. Some collection subtypes (such as Array) support fast, direct access by integer member offset, while others support member offsets only as a shorthand for sequential access through every preceding member. Access by offsets is supported on all collections regardless of whether its speed on a particular collection type. atOffset: and atOffset:put: raise the error OffsetOutOfRange if the offset is greater than or equal to the count of members in the collection.
Method Summary | |
java.lang.Object |
atOffset(int offset)
Returns the member at a particular member offset. |
java.lang.Object |
atOffset$put(int offset,
java.lang.Object anObject)
The atOffset: put: message replaces the member at a particular offset with a new value, and returns the previous member value at this offset. |
java.lang.Object |
getFirst()
Equivalent to [aCollection atOffset: 0]. |
java.lang.Object |
getLast()
Equivalent to [aCollection atOffset: [aCollection getCount] - 1]. |
Method Detail |
public java.lang.Object atOffset(int offset)
public java.lang.Object atOffset$put(int offset, java.lang.Object anObject)
public java.lang.Object getFirst()
public java.lang.Object getLast()
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