构造器：
File(File parent, String child)
Creates a new
File instance from a parent abstract pathname and a child pathname string. |
File(String pathname)
Creates a new
File instance by converting the given pathname string into an abstract pathname. |
File(String parent, String child)
Creates a new
File instance from a parent pathname string and a child pathname string. |
File(URI uri) |
常用方法：
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boolean |
canExecute()
Tests whether the application can execute the file denoted by this abstract pathname.
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boolean |
canRead()
Tests whether the application can read the file denoted by this abstract pathname.
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boolean |
canWrite()
Tests whether the application can modify the file denoted by this abstract pathname.
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int |
compareTo(File pathname)
Compares two abstract pathnames lexicographically.
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boolean |
createNewFile()
Atomically creates a new, empty file named by this abstract pathname if and only if a file with this name does not yet exist.
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static File |
createTempFile(String prefix, String suffix)
Creates an empty file in the default temporary-file directory, using the given prefix and suffix to generate its name.
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static File |
createTempFile(String prefix, String suffix, File directory)
Creates a new empty file in the specified directory, using the given prefix and suffix strings to generate its name.
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boolean |
delete()
Deletes the file or directory denoted by this abstract pathname.
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void |
deleteOnExit()
Requests that the file or directory denoted by this abstract pathname be deleted when the virtual machine terminates.
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boolean |
equals(Object obj)
Tests this abstract pathname for equality with the given object.
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boolean |
exists()
Tests whether the file or directory denoted by this abstract pathname exists.
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File |
getAbsoluteFile()
Returns the absolute form of this abstract pathname.
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String |
getAbsolutePath()
Returns the absolute pathname string of this abstract pathname.
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File |
getCanonicalFile()
Returns the canonical form of this abstract pathname.
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String |
getCanonicalPath()
Returns the canonical pathname string of this abstract pathname.
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long |
getFreeSpace()
Returns the number of unallocated bytes in the partition named by this abstract path name.
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String |
getName()
Returns the name of the file or directory denoted by this abstract pathname.
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String |
getParent()
Returns the pathname string of this abstract pathname's parent, or
null if this pathname does not name a parent directory. |
File |
getParentFile()
Returns the abstract pathname of this abstract pathname's parent, or
null if this pathname does not name a parent directory. |
String |
getPath()
Converts this abstract pathname into a pathname string.
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long |
getTotalSpace()
Returns the size of the partition named by this abstract pathname.
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long |
getUsableSpace()
Returns the number of bytes available to this virtual machine on the partition named by this abstract pathname.
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int |
hashCode()
Computes a hash code for this abstract pathname.
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boolean |
isAbsolute()
Tests whether this abstract pathname is absolute.
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boolean |
isDirectory()
Tests whether the file denoted by this abstract pathname is a directory.
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boolean |
isFile()
Tests whether the file denoted by this abstract pathname is a normal file.
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boolean |
isHidden()
Tests whether the file named by this abstract pathname is a hidden file.
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long |
lastModified()
Returns the time that the file denoted by this abstract pathname was last modified.
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long |
length()
Returns the length of the file denoted by this abstract pathname.
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String[] |
list()
Returns an array of strings naming the files and directories in the directory denoted by this abstract pathname.
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String[] |
list(FilenameFilter filter)
Returns an array of strings naming the files and directories in the directory denoted by this abstract pathname that satisfy the specified filter.
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File[] |
listFiles()
Returns an array of abstract pathnames denoting the files in the directory denoted by this abstract pathname.
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File[] |
listFiles(FileFilter filter)
Returns an array of abstract pathnames denoting the files and directories in the directory denoted by this abstract pathname that satisfy the specified filter.
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File[] |
listFiles(FilenameFilter filter)
Returns an array of abstract pathnames denoting the files and directories in the directory denoted by this abstract pathname that satisfy the specified filter.
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static File[] |
listRoots()
List the available filesystem roots.
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boolean |
mkdir()
Creates the directory named by this abstract pathname.
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boolean |
mkdirs()
Creates the directory named by this abstract pathname, including any necessary but nonexistent parent directories.
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boolean |
renameTo(File dest)
Renames the file denoted by this abstract pathname.
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boolean |
setExecutable(boolean executable)
A convenience method to set the owner's execute permission for this abstract pathname.
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boolean |
setExecutable(boolean executable, boolean ownerOnly)
Sets the owner's or everybody's execute permission for this abstract pathname.
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boolean |
setLastModified(long time)
Sets the last-modified time of the file or directory named by this abstract pathname.
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boolean |
setReadable(boolean readable)
A convenience method to set the owner's read permission for this abstract pathname.
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boolean |
setReadable(boolean readable, boolean ownerOnly)
Sets the owner's or everybody's read permission for this abstract pathname.
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boolean |
setReadOnly()
Marks the file or directory named by this abstract pathname so that only read operations are allowed.
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boolean |
setWritable(boolean writable)
A convenience method to set the owner's write permission for this abstract pathname.
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boolean |
setWritable(boolean writable, boolean ownerOnly)
Sets the owner's or everybody's write permission for this abstract pathname.
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Path |
toPath()
Returns a
java.nio.file.Path object constructed from the this abstract path. |
String |
toString()
Returns the pathname string of this abstract pathname.
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URI |
toURI()
Constructs a file: URI that represents this abstract pathname.
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URL |
toURL()
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