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Returns an object that uniquely identifies the given file, or null if a file key is not available. On some platforms or file systems it is possible to use an identifier, or a combination of identifiers to uniquely identify a file. Such identifiers are important for operations such as file tree traversal in file systems that support symbolic links or file systems that allow a file to be an entry in more than one directory. On UNIX file systems, for example, the device ID and inode are commonly used for such purposes.
The file key returned by this method can only be guaranteed to be unique if the file system and files remain static. Whether a file system re-uses identifiers after a file is deleted is implementation dependent and therefore consequently unspecified.
File keys returned by this method can be compared for equality and are suitable for use in collections. If the file system and files remain static, and two files are the same with non-null file keys, then their file keys are equal.
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<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="969b3289ede4e205-f322913c-4572474e-b8d494c3-6a538489847c2dd942fdfaa1"><ac:plain-text-body><![CDATA[ | [[API 2006 | AA. Bibliography#API 06]] | Class File, methods | ]]></ac:plain-text-body></ac:structured-macro> | |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="fdfdf18ac39e2417-93d4cc04-49db4457-9233922b-7d6b23d78da88a600b7fe6fd"><ac:plain-text-body><![CDATA[ | [[CVE 2008 | AA. Bibliography#CVE 08]] | [CVE-2008-5354 | http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-5354] | ]]></ac:plain-text-body></ac:structured-macro> |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="c636dbe4760cdf04-c39a6bcf-4283451c-85b583ce-823b9307f3be7c955aa17697"><ac:plain-text-body><![CDATA[ | [[Darwin 2004 | AA. Bibliography#Darwin 04]] | 11.5 Creating a Transient File | ]]></ac:plain-text-body></ac:structured-macro> | |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="b04b655375cff41c-a8edb514-41e34c5e-a6eeb2ed-2b635c6a5fc62b248ab1e182"><ac:plain-text-body><![CDATA[ | [[Garfinkel 1996 | AA. Bibliography#Garfinkel 96]] | Section 5.6, "Device Files" | ]]></ac:plain-text-body></ac:structured-macro> | |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="6c8d423ffc868f14-f7999ae2-4b134332-98f4933a-565f5086c4558264733d563a"><ac:plain-text-body><![CDATA[ | [[Howard 2002 | AA. Bibliography#Howard 02]] | Chapter 11, "Canonical Representation Issues" | ]]></ac:plain-text-body></ac:structured-macro> | |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="3e565fdbe81fbeac-6fcd7a17-4f1c4154-a22d893d-6feb644a22dfa94a7b71e17e"><ac:plain-text-body><![CDATA[ | [[J2SE 2011 | AA. Bibliography#J2SE 11]] | The try-with-resources Statement | ]]></ac:plain-text-body></ac:structured-macro> | |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="4bba94289dc2c8d2-72fc10b3-43d94dd7-a4ca86a0-2380fa854615c382a9155cf1"><ac:plain-text-body><![CDATA[ | [[Open Group 2004 | AA. Bibliography#Open Group 04]] | [ | http://www.opengroup.org/onlinepubs/009695399/functions/open.html] | ]]></ac:plain-text-body></ac:structured-macro> |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="a7a36b53a1cb0f47-13e36104-48454ae8-8812b86d-a7f52f6aa6876eaa3798749a"><ac:plain-text-body><![CDATA[ | [[SDN 2008 | AA. Bibliography#SDN 08]] | Bug IDs: 4171239, 4405521, 4635827, 4631820 | ]]></ac:plain-text-body></ac:structured-macro> | |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="82b2b0fbf35f52d4-02db2ced-443145f4-9bab9c90-6270367ab1777f3d4410609a"><ac:plain-text-body><![CDATA[ | [[Secunia 2008 | AA. Bibliography#Secunia 08]] | [Secunia Advisory 20132 | http://secunia.com/advisories/20132/] | ]]></ac:plain-text-body></ac:structured-macro> |
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