public final class FileTime extends Object implements Comparable<FileTime>
Represents the value of a file's time stamp attribute. For example, it may represent the time that the file was last modified
, accessed
, or created
.
Instances of this class are immutable.
Files.setLastModifiedTime(java.nio.file.Path, java.nio.file.attribute.FileTime)
, Files.getLastModifiedTime(java.nio.file.Path, java.nio.file.LinkOption...)
public static FileTime from(long value, TimeUnit unit)
Returns a FileTime
representing a value at the given unit of granularity.
value
- the value since the epoch (1970-01-01T00:00:00Z); can be negativeunit
- the unit of granularity to interpret the valueFileTime
representing the given valuepublic static FileTime fromMillis(long value)
Returns a FileTime
representing the given value in milliseconds.
value
- the value, in milliseconds, since the epoch (1970-01-01T00:00:00Z); can be negativeFileTime
representing the given valuepublic static FileTime from(Instant instant)
Returns a FileTime
representing the same point of time value on the time-line as the provided Instant
object.
instant
- the instant to convertFileTime
representing the same point on the time-line as the provided instantpublic long to(TimeUnit unit)
Returns the value at the given unit of granularity.
Conversion from a coarser granularity that would numerically overflow saturate to Long.MIN_VALUE
if negative or Long.MAX_VALUE
if positive.
unit
- the unit of granularity for the return valuepublic long toMillis()
Returns the value in milliseconds.
Conversion from a coarser granularity that would numerically overflow saturate to Long.MIN_VALUE
if negative or Long.MAX_VALUE
if positive.
public Instant toInstant()
Converts this FileTime
object to an Instant
.
The conversion creates an Instant
that represents the same point on the time-line as this FileTime
.
FileTime
can store points on the time-line further in the future and further in the past than Instant
. Conversion from such further time points saturates to Instant.MIN
if earlier than Instant.MIN
or Instant.MAX
if later than Instant.MAX
.
FileTime
objectpublic boolean equals(Object obj)
Tests this FileTime
for equality with the given object.
The result is true
if and only if the argument is not null
and is a FileTime
that represents the same time. This method satisfies the general contract of the Object.equals
method.
equals
in class Object
obj
- the object to compare withtrue
if, and only if, the given object is a FileTime
that represents the same timeObject.hashCode()
, HashMap
public int hashCode()
Computes a hash code for this file time.
The hash code is based upon the value represented, and satisfies the general contract of the Object.hashCode()
method.
hashCode
in class Object
Object.equals(java.lang.Object)
, System.identityHashCode(java.lang.Object)
public int compareTo(FileTime other)
Compares the value of two FileTime
objects for order.
compareTo
in interface Comparable<FileTime>
other
- the other FileTime
to be compared0
if this FileTime
is equal to other
, a value less than 0 if this FileTime
represents a time that is before other
, and a value greater than 0 if this FileTime
represents a time that is after other
public String toString()
Returns the string representation of this FileTime
. The string is returned in the ISO 8601 format:
YYYY-MM-DDThh:mm:ss[.s+]Zwhere "
[.s+]
" represents a dot followed by one of more digits for the decimal fraction of a second. It is only present when the decimal fraction of a second is not zero. For example, FileTime.fromMillis(1234567890000L).toString()
yields "2009-02-13T23:31:30Z"
, and FileTime.fromMillis(1234567890123L).toString()
yields "2009-02-13T23:31:30.123Z"
.
A FileTime
is primarily intended to represent the value of a file's time stamp. Where used to represent extreme values, where the year is less than "0001
" or greater than "9999
" then this method deviates from ISO 8601 in the same manner as the XML Schema language. That is, the year may be expanded to more than four digits and may be negative-signed. If more than four digits then leading zeros are not present. The year before "0001
" is "-0001
".
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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
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