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- All Known Subinterfaces:
- DosFileAttributes, PosixFileAttributes
public interface BasicFileAttributes
Basic attributes associated with a file in a file system.Basic file attributes are attributes that are common to many file systems and consist of mandatory and optional file attributes as defined by this interface.
Usage Example:
Path file = ... BasicFileAttributes attrs = Files.readAttributes(file, BasicFileAttributes.class);
- Since:
- 1.7
- See Also:
BasicFileAttributeView
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Method Summary
Methods Modifier and Type Method and Description FileTime
creationTime()
Returns the creation time.Object
fileKey()
Returns an object that uniquely identifies the given file, ornull
if a file key is not available.boolean
isDirectory()
Tells whether the file is a directory.boolean
isOther()
Tells whether the file is something other than a regular file, directory, or symbolic link.boolean
isRegularFile()
Tells whether the file is a regular file with opaque content.boolean
isSymbolicLink()
Tells whether the file is a symbolic link.FileTime
lastAccessTime()
Returns the time of last access.FileTime
lastModifiedTime()
Returns the time of last modification.long
size()
Returns the size of the file (in bytes).
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Method Detail
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lastModifiedTime
FileTime lastModifiedTime()
Returns the time of last modification.If the file system implementation does not support a time stamp to indicate the time of last modification then this method returns an implementation specific default value, typically a
FileTime
representing the epoch (1970-01-01T00:00:00Z).- Returns:
- a
FileTime
representing the time the file was last modified
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lastAccessTime
FileTime lastAccessTime()
Returns the time of last access.If the file system implementation does not support a time stamp to indicate the time of last access then this method returns an implementation specific default value, typically the
last-modified-time
or aFileTime
representing the epoch (1970-01-01T00:00:00Z).- Returns:
- a
FileTime
representing the time of last access
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creationTime
FileTime creationTime()
Returns the creation time. The creation time is the time that the file was created.If the file system implementation does not support a time stamp to indicate the time when the file was created then this method returns an implementation specific default value, typically the
last-modified-time
or aFileTime
representing the epoch (1970-01-01T00:00:00Z).- Returns:
- a
FileTime
representing the time the file was created
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isRegularFile
boolean isRegularFile()
Tells whether the file is a regular file with opaque content.
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isDirectory
boolean isDirectory()
Tells whether the file is a directory.
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isSymbolicLink
boolean isSymbolicLink()
Tells whether the file is a symbolic link.
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isOther
boolean isOther()
Tells whether the file is something other than a regular file, directory, or symbolic link.
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size
long size()
Returns the size of the file (in bytes). The size may differ from the actual size on the file system due to compression, support for sparse files, or other reasons. The size of files that are notregular
files is implementation specific and therefore unspecified.- Returns:
- the file size, in bytes
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fileKey
Object fileKey()
Returns an object that uniquely identifies the given file, ornull
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 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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Bij voorbaat dank.
Document heeft de 11/06/2005 gemaakt, de laatste keer de 04/03/2020 gewijzigd
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