RandomAccessFile
open class RandomAccessFile : DataOutput, DataInput, Closeable
kotlin.Any | |
↳ | java.io.RandomAccessFile |
Instances of this class support both reading and writing to a random access file. A random access file behaves like a large array of bytes stored in the file system. There is a kind of cursor, or index into the implied array, called the file pointer; input operations read bytes starting at the file pointer and advance the file pointer past the bytes read. If the random access file is created in read/write mode, then output operations are also available; output operations write bytes starting at the file pointer and advance the file pointer past the bytes written. Output operations that write past the current end of the implied array cause the array to be extended. The file pointer can be read by the getFilePointer
method and set by the seek
method.
It is generally true of all the reading routines in this class that if end-of-file is reached before the desired number of bytes has been read, an EOFException
(which is a kind of IOException
) is thrown. If any byte cannot be read for any reason other than end-of-file, an IOException
other than EOFException
is thrown. In particular, an IOException
may be thrown if the stream has been closed.
Summary
Public constructors | |
---|---|
RandomAccessFile(name: String!, mode: String!) Creates a random access file stream to read from, and optionally to write to, a file with the specified name. |
|
RandomAccessFile(file: File!, mode: String!) Creates a random access file stream to read from, and optionally to write to, the file specified by the |
Public methods | |
---|---|
open Unit |
close() Closes this random access file stream and releases any system resources associated with the stream. |
FileChannel! |
Returns the unique |
FileDescriptor! |
getFD() Returns the opaque file descriptor object associated with this stream. |
open Long |
Returns the current offset in this file. |
open Long |
length() Returns the length of this file. |
open Int |
read() Reads a byte of data from this file. |
open Int |
Reads up to |
open Int |
Reads up to |
Boolean |
Reads a |
Byte |
readByte() Reads a signed eight-bit value from this file. |
Char |
readChar() Reads a character from this file. |
Double |
Reads a |
Float |
Reads a |
Unit |
Reads |
Unit |
Reads exactly |
Int |
readInt() Reads a signed 32-bit integer from this file. |
String! |
readLine() Reads the next line of text from this file. |
Long |
readLong() Reads a signed 64-bit integer from this file. |
Short |
Reads a signed 16-bit number from this file. |
String! |
readUTF() Reads in a string from this file. |
Int |
Reads an unsigned eight-bit number from this file. |
Int |
Reads an unsigned 16-bit number from this file. |
open Unit |
Sets the file-pointer offset, measured from the beginning of this file, at which the next read or write occurs. |
open Unit |
Sets the length of this file. |
open Int |
Attempts to skip over |
open Unit |
Writes the specified byte to this file. |
open Unit |
Writes |
open Unit |
Writes |
Unit |
writeBoolean(v: Boolean) Writes a |
Unit |
Writes a |
Unit |
writeBytes(s: String!) Writes the string to the file as a sequence of bytes. |
Unit |
Writes a |
Unit |
writeChars(s: String!) Writes a string to the file as a sequence of characters. |
Unit |
writeDouble(v: Double) Converts the double argument to a |
Unit |
writeFloat(v: Float) Converts the float argument to an |
Unit |
Writes an |
Unit |
Writes a |
Unit |
writeShort(v: Int) Writes a |
Unit |
Writes a string to the file using modified UTF-8 encoding in a machine-independent manner. |
Protected methods | |
---|---|
open Unit |
finalize() |
Public constructors
RandomAccessFile
RandomAccessFile(
name: String!,
mode: String!)
Creates a random access file stream to read from, and optionally to write to, a file with the specified name. A new FileDescriptor
object is created to represent the connection to the file.
The mode argument specifies the access mode with which the file is to be opened. The permitted values and their meanings are as specified for the RandomAccessFile(File,String) constructor.
If there is a security manager, its checkRead
method is called with the name
argument as its argument to see if read access to the file is allowed. If the mode allows writing, the security manager's checkWrite
method is also called with the name
argument as its argument to see if write access to the file is allowed.
Parameters | |
---|---|
name |
String!: the system-dependent filename |
mode |
String!: the access mode |
Exceptions | |
---|---|
java.lang.IllegalArgumentException |
if the mode argument is not equal to one of "r", "rw", "rws", or "rwd" |
java.io.FileNotFoundException |
if the mode is "r" but the given string does not denote an existing regular file, or if the mode begins with "rw" but the given string does not denote an existing, writable regular file and a new regular file of that name cannot be created, or if some other error occurs while opening or creating the file |
java.lang.SecurityException |
if a security manager exists and its checkRead method denies read access to the file or the mode is "rw" and the security manager's checkWrite method denies write access to the file |
RandomAccessFile
RandomAccessFile(
file: File!,
mode: String!)
Creates a random access file stream to read from, and optionally to write to, the file specified by the File
argument. A new FileDescriptor
object is created to represent this file connection.
The mode argument specifies the access mode in which the file is to be opened. The permitted values and their meanings are:
Value | Meaning |
---|---|
"r" | Open for reading only. Invoking any of the write methods of the resulting object will cause an to be thrown. |
"rw" | Open for reading and writing. If the file does not already exist then an attempt will be made to create it. |
"rws" | Open for reading and writing, as with "rw", and also require that every update to the file's content or metadata be written synchronously to the underlying storage device. |
"rwd" | Open for reading and writing, as with "rw", and also require that every update to the file's content be written synchronously to the underlying storage device. |
force(boolean)
method of the java.nio.channels.FileChannel
class, passing arguments of true and false, respectively, except that they always apply to every I/O operation and are therefore often more efficient. If the file resides on a local storage device then when an invocation of a method of this class returns it is guaranteed that all changes made to the file by that invocation will have been written to that device. This is useful for ensuring that critical information is not lost in the event of a system crash. If the file does not reside on a local device then no such guarantee is made.
The "rwd" mode can be used to reduce the number of I/O operations performed. Using "rwd" only requires updates to the file's content to be written to storage; using "rws" requires updates to both the file's content and its metadata to be written, which generally requires at least one more low-level I/O operation.
If there is a security manager, its checkRead
method is called with the pathname of the file
argument as its argument to see if read access to the file is allowed. If the mode allows writing, the security manager's checkWrite
method is also called with the path argument to see if write access to the file is allowed.
Parameters | |
---|---|
file |
File!: the file object |
mode |
String!: the access mode, as described above |
Exceptions | |
---|---|
java.lang.IllegalArgumentException |
if the mode argument is not equal to one of "r", "rw", "rws", or "rwd" |
java.io.FileNotFoundException |
if the mode is "r" but the given file object does not denote an existing regular file, or if the mode begins with "rw" but the given file object does not denote an existing, writable regular file and a new regular file of that name cannot be created, or if some other error occurs while opening or creating the file |
java.lang.SecurityException |
if a security manager exists and its checkRead method denies read access to the file or the mode is "rw" and the security manager's checkWrite method denies write access to the file |
Public methods
close
open fun close(): Unit
Closes this random access file stream and releases any system resources associated with the stream. A closed random access file cannot perform input or output operations and cannot be reopened.
If this file has an associated channel then the channel is closed as well.
Exceptions | |
---|---|
java.lang.Exception |
if this resource cannot be closed |
java.io.IOException |
if an I/O error occurs |
java.io.IOException |
if an I/O error occurs. |
getChannel
fun getChannel(): FileChannel!
Returns the unique FileChannel
object associated with this file.
The position
of the returned channel will always be equal to this object's file-pointer offset as returned by the getFilePointer
method. Changing this object's file-pointer offset, whether explicitly or by reading or writing bytes, will change the position of the channel, and vice versa. Changing the file's length via this object will change the length seen via the file channel, and vice versa.
Return | |
---|---|
FileChannel! |
the file channel associated with this file |
getFD
fun getFD(): FileDescriptor!
Returns the opaque file descriptor object associated with this stream.
Return | |
---|---|
FileDescriptor! |
the file descriptor object associated with this stream. |
Exceptions | |
---|---|
java.io.IOException |
if an I/O error occurs. |
See Also
getFilePointer
open fun getFilePointer(): Long
Returns the current offset in this file.
Return | |
---|---|
Long |
the offset from the beginning of the file, in bytes, at which the next read or write occurs. |
Exceptions | |
---|---|
java.io.IOException |
if an I/O error occurs. |
length
open fun length(): Long
Returns the length of this file.
Return | |
---|---|
Long |
the length of this file, measured in bytes. |
Exceptions | |
---|---|
java.io.IOException |
if an I/O error occurs. |
read
open fun read(): Int
Reads a byte of data from this file. The byte is returned as an integer in the range 0 to 255 (0x00-0x0ff
). This method blocks if no input is yet available.
Although RandomAccessFile
is not a subclass of InputStream
, this method behaves in exactly the same way as the InputStream#read()
method of InputStream
.
Return | |
---|---|
Int |
the next byte of data, or -1 if the end of the file has been reached. |
Exceptions | |
---|---|
java.io.IOException |
if an I/O error occurs. Not thrown if end-of-file has been reached. |
read
open fun read(
b: ByteArray!,
off: Int,
len: Int
): Int
Reads up to len
bytes of data from this file into an array of bytes. This method blocks until at least one byte of input is available.
Although RandomAccessFile
is not a subclass of InputStream
, this method behaves in exactly the same way as the InputStream#read(byte[], int, int)
method of InputStream
.
Parameters | |
---|---|
b |
ByteArray!: the buffer into which the data is read. |
off |
Int: the start offset in array b at which the data is written. |
len |
Int: the maximum number of bytes read. |
Return | |
---|---|
Int |
the total number of bytes read into the buffer, or -1 if there is no more data because the end of the file has been reached. |
Exceptions | |
---|---|
java.io.IOException |
If the first byte cannot be read for any reason other than end of file, or if the random access file has been closed, or if some other I/O error occurs. |
java.lang.NullPointerException |
If b is null . |
java.lang.IndexOutOfBoundsException |
If off is negative, len is negative, or len is greater than b.length - off |
read
open fun read(b: ByteArray!): Int
Reads up to b.length
bytes of data from this file into an array of bytes. This method blocks until at least one byte of input is available.
Although RandomAccessFile
is not a subclass of InputStream
, this method behaves in exactly the same way as the InputStream#read(byte[])
method of InputStream
.
Parameters | |
---|---|
b |
ByteArray!: the buffer into which the data is read. |
Return | |
---|---|
Int |
the total number of bytes read into the buffer, or -1 if there is no more data because the end of this file has been reached. |
Exceptions | |
---|---|
java.io.IOException |
If the first byte cannot be read for any reason other than end of file, or if the random access file has been closed, or if some other I/O error occurs. |
java.lang.NullPointerException |
If b is null . |
readBoolean
fun readBoolean(): Boolean
Reads a boolean
from this file. This method reads a single byte from the file, starting at the current file pointer. A value of 0
represents false
. Any other value represents true
. This method blocks until the byte is read, the end of the stream is detected, or an exception is thrown.
Return | |
---|---|
Boolean |
the boolean value read. |
Exceptions | |
---|---|
java.io.EOFException |
if this file has reached the end. |
java.io.IOException |
if an I/O error occurs. |
readByte
fun readByte(): Byte
Reads a signed eight-bit value from this file. This method reads a byte from the file, starting from the current file pointer. If the byte read is b
, where 0 <= b <= 255
, then the result is:
(byte)(b)
This method blocks until the byte is read, the end of the stream is detected, or an exception is thrown.
Return | |
---|---|
Byte |
the next byte of this file as a signed eight-bit byte . |
Exceptions | |
---|---|
java.io.EOFException |
if this file has reached the end. |
java.io.IOException |
if an I/O error occurs. |
readChar
fun readChar(): Char
Reads a character from this file. This method reads two bytes from the file, starting at the current file pointer. If the bytes read, in order, are b1
and b2
, where 0 <= b1, b2 <= 255
, then the result is equal to:
(char)((b1 << 8) | b2)
This method blocks until the two bytes are read, the end of the stream is detected, or an exception is thrown.
Return | |
---|---|
Char |
the next two bytes of this file, interpreted as a char . |
Exceptions | |
---|---|
java.io.EOFException |
if this file reaches the end before reading two bytes. |
java.io.IOException |
if an I/O error occurs. |
readDouble
fun readDouble(): Double
Reads a double
from this file. This method reads a long
value, starting at the current file pointer, as if by the readLong
method and then converts that long
to a double
using the longBitsToDouble
method in class Double
.
This method blocks until the eight bytes are read, the end of the stream is detected, or an exception is thrown.
Return | |
---|---|
Double |
the next eight bytes of this file, interpreted as a double . |
Exceptions | |
---|---|
java.io.EOFException |
if this file reaches the end before reading eight bytes. |
java.io.IOException |
if an I/O error occurs. |
readFloat
fun readFloat(): Float
Reads a float
from this file. This method reads an int
value, starting at the current file pointer, as if by the readInt
method and then converts that int
to a float
using the intBitsToFloat
method in class Float
.
This method blocks until the four bytes are read, the end of the stream is detected, or an exception is thrown.
Return | |
---|---|
Float |
the next four bytes of this file, interpreted as a float . |
Exceptions | |
---|---|
java.io.EOFException |
if this file reaches the end before reading four bytes. |
java.io.IOException |
if an I/O error occurs. |
readFully
fun readFully(b: ByteArray!): Unit
Reads b.length
bytes from this file into the byte array, starting at the current file pointer. This method reads repeatedly from the file until the requested number of bytes are read. This method blocks until the requested number of bytes are read, the end of the stream is detected, or an exception is thrown.
Parameters | |
---|---|
b |
ByteArray!: the buffer into which the data is read. |
Exceptions | |
---|---|
java.lang.NullPointerException |
if b is null . |
java.io.EOFException |
if this stream reaches the end before reading all the bytes. |
java.io.IOException |
if an I/O error occurs. |
java.io.EOFException |
if this file reaches the end before reading all the bytes. |
java.io.IOException |
if an I/O error occurs. |
readFully
fun readFully(
b: ByteArray!,
off: Int,
len: Int
): Unit
Reads exactly len
bytes from this file into the byte array, starting at the current file pointer. This method reads repeatedly from the file until the requested number of bytes are read. This method blocks until the requested number of bytes are read, the end of the stream is detected, or an exception is thrown.
Parameters | |
---|---|
b |
ByteArray!: the buffer into which the data is read. |
off |
Int: the start offset of the data. |
len |
Int: the number of bytes to read. |
Exceptions | |
---|---|
java.lang.NullPointerException |
if b is null . |
java.lang.IndexOutOfBoundsException |
if off is negative, len is negative, or len is greater than b.length - off . |
java.io.EOFException |
if this stream reaches the end before reading all the bytes. |
java.io.IOException |
if an I/O error occurs. |
java.io.EOFException |
if this file reaches the end before reading all the bytes. |
java.io.IOException |
if an I/O error occurs. |
readInt
fun readInt(): Int
Reads a signed 32-bit integer from this file. This method reads 4 bytes from the file, starting at the current file pointer. If the bytes read, in order, are b1
, b2
, b3
, and b4
, where 0 <= b1, b2, b3, b4 <= 255
, then the result is equal to:
(b1 << 24) | (b2 << 16) + (b3 << 8) + b4
This method blocks until the four bytes are read, the end of the stream is detected, or an exception is thrown.
Return | |
---|---|
Int |
the next four bytes of this file, interpreted as an int . |
Exceptions | |
---|---|
java.io.EOFException |
if this file reaches the end before reading four bytes. |
java.io.IOException |
if an I/O error occurs. |
readLine
fun readLine(): String!
Reads the next line of text from this file. This method successively reads bytes from the file, starting at the current file pointer, until it reaches a line terminator or the end of the file. Each byte is converted into a character by taking the byte's value for the lower eight bits of the character and setting the high eight bits of the character to zero. This method does not, therefore, support the full Unicode character set.
A line of text is terminated by a carriage-return character ('\u005Cr'
), a newline character ('\u005Cn'
), a carriage-return character immediately followed by a newline character, or the end of the file. Line-terminating characters are discarded and are not included as part of the string returned.
This method blocks until a newline character is read, a carriage return and the byte following it are read (to see if it is a newline), the end of the file is reached, or an exception is thrown.
Return | |
---|---|
String! |
the next line of text from this file, or null if end of file is encountered before even one byte is read. |
Exceptions | |
---|---|
java.io.IOException |
if an I/O error occurs. |
readLong
fun readLong(): Long
Reads a signed 64-bit integer from this file. This method reads eight bytes from the file, starting at the current file pointer. If the bytes read, in order, are b1
, b2
, b3
, b4
, b5
, b6
, b7
, and b8,
where:
0 <= b1, b2, b3, b4, b5, b6, b7, b8 <=255,
then the result is equal to:
((long)b1 << 56) + ((long)b2 << 48) + ((long)b3 << 40) + ((long)b4 << 32) + ((long)b5 << 24) + ((long)b6 << 16) + ((long)b7 << 8) + b8
This method blocks until the eight bytes are read, the end of the stream is detected, or an exception is thrown.
Return | |
---|---|
Long |
the next eight bytes of this file, interpreted as a long . |
Exceptions | |
---|---|
java.io.EOFException |
if this file reaches the end before reading eight bytes. |
java.io.IOException |
if an I/O error occurs. |
readShort
fun readShort(): Short
Reads a signed 16-bit number from this file. The method reads two bytes from this file, starting at the current file pointer. If the two bytes read, in order, are b1
and b2
, where each of the two values is between 0
and 255
, inclusive, then the result is equal to:
(short)((b1 << 8) | b2)
This method blocks until the two bytes are read, the end of the stream is detected, or an exception is thrown.
Return | |
---|---|
Short |
the next two bytes of this file, interpreted as a signed 16-bit number. |
Exceptions | |
---|---|
java.io.EOFException |
if this file reaches the end before reading two bytes. |
java.io.IOException |
if an I/O error occurs. |
readUTF
fun readUTF(): String!
Reads in a string from this file. The string has been encoded using a modified UTF-8 format.
The first two bytes are read, starting from the current file pointer, as if by readUnsignedShort
. This value gives the number of following bytes that are in the encoded string, not the length of the resulting string. The following bytes are then interpreted as bytes encoding characters in the modified UTF-8 format and are converted into characters.
This method blocks until all the bytes are read, the end of the stream is detected, or an exception is thrown.
Return | |
---|---|
String! |
a Unicode string. |
Exceptions | |
---|---|
java.io.EOFException |
if this file reaches the end before reading all the bytes. |
java.io.IOException |
if an I/O error occurs. |
java.io.UTFDataFormatException |
if the bytes do not represent valid modified UTF-8 encoding of a Unicode string. |
readUnsignedByte
fun readUnsignedByte(): Int
Reads an unsigned eight-bit number from this file. This method reads a byte from this file, starting at the current file pointer, and returns that byte.
This method blocks until the byte is read, the end of the stream is detected, or an exception is thrown.
Return | |
---|---|
Int |
the next byte of this file, interpreted as an unsigned eight-bit number. |
Exceptions | |
---|---|
java.io.EOFException |
if this file has reached the end. |
java.io.IOException |
if an I/O error occurs. |
readUnsignedShort
fun readUnsignedShort(): Int
Reads an unsigned 16-bit number from this file. This method reads two bytes from the file, starting at the current file pointer. If the bytes read, in order, are b1
and b2
, where 0 <= b1, b2 <= 255
, then the result is equal to:
(b1 << 8) | b2
This method blocks until the two bytes are read, the end of the stream is detected, or an exception is thrown.
Return | |
---|---|
Int |
the next two bytes of this file, interpreted as an unsigned 16-bit integer. |
Exceptions | |
---|---|
java.io.EOFException |
if this file reaches the end before reading two bytes. |
java.io.IOException |
if an I/O error occurs. |
seek
open fun seek(pos: Long): Unit
Sets the file-pointer offset, measured from the beginning of this file, at which the next read or write occurs. The offset may be set beyond the end of the file. Setting the offset beyond the end of the file does not change the file length. The file length will change only by writing after the offset has been set beyond the end of the file.
Parameters | |
---|---|
pos |
Long: the offset position, measured in bytes from the beginning of the file, at which to set the file pointer. |
Exceptions | |
---|---|
java.io.IOException |
if pos is less than 0 or if an I/O error occurs. |
setLength
open fun setLength(newLength: Long): Unit
Sets the length of this file.
If the present length of the file as returned by the length
method is greater than the newLength
argument then the file will be truncated. In this case, if the file offset as returned by the getFilePointer
method is greater than newLength
then after this method returns the offset will be equal to newLength
.
If the present length of the file as returned by the length
method is smaller than the newLength
argument then the file will be extended. In this case, the contents of the extended portion of the file are not defined.
Parameters | |
---|---|
newLength |
Long: The desired length of the file |
Exceptions | |
---|---|
java.io.IOException |
If an I/O error occurs |
skipBytes
open fun skipBytes(n: Int): Int
Attempts to skip over n
bytes of input discarding the skipped bytes.
This method may skip over some smaller number of bytes, possibly zero. This may result from any of a number of conditions; reaching end of file before n
bytes have been skipped is only one possibility. This method never throws an EOFException
. The actual number of bytes skipped is returned. If n
is negative, no bytes are skipped.
Parameters | |
---|---|
n |
Int: the number of bytes to be skipped. |
Return | |
---|---|
Int |
the actual number of bytes skipped. |
Exceptions | |
---|---|
java.io.IOException |
if an I/O error occurs. |
write
open fun write(b: Int): Unit
Writes the specified byte to this file. The write starts at the current file pointer.
Parameters | |
---|---|
b |
Int: the byte to be written. |
Exceptions | |
---|---|
java.io.IOException |
if an I/O error occurs. |
java.io.IOException |
if an I/O error occurs. |
write
open fun write(b: ByteArray!): Unit
Writes b.length
bytes from the specified byte array to this file, starting at the current file pointer.
Parameters | |
---|---|
b |
ByteArray!: the data. |
Exceptions | |
---|---|
java.io.IOException |
if an I/O error occurs. |
java.io.IOException |
if an I/O error occurs. |
write
open fun write(
b: ByteArray!,
off: Int,
len: Int
): Unit
Writes len
bytes from the specified byte array starting at offset off
to this file.
Parameters | |
---|---|
b |
ByteArray!: the data. |
off |
Int: the start offset in the data. |
len |
Int: the number of bytes to write. |
Exceptions | |
---|---|
java.io.IOException |
if an I/O error occurs. |
java.io.IOException |
if an I/O error occurs. |
writeBoolean
fun writeBoolean(v: Boolean): Unit
Writes a boolean
to the file as a one-byte value. The value true
is written out as the value (byte)1
; the value false
is written out as the value (byte)0
. The write starts at the current position of the file pointer.
Parameters | |
---|---|
v |
Boolean: a boolean value to be written. |
Exceptions | |
---|---|
java.io.IOException |
if an I/O error occurs. |
java.io.IOException |
if an I/O error occurs. |
writeByte
fun writeByte(v: Int): Unit
Writes a byte
to the file as a one-byte value. The write starts at the current position of the file pointer.
Parameters | |
---|---|
v |
Int: a byte value to be written. |
Exceptions | |
---|---|
java.io.IOException |
if an I/O error occurs. |
java.io.IOException |
if an I/O error occurs. |
writeBytes
fun writeBytes(s: String!): Unit
Writes the string to the file as a sequence of bytes. Each character in the string is written out, in sequence, by discarding its high eight bits. The write starts at the current position of the file pointer.
Parameters | |
---|---|
s |
String!: a string of bytes to be written. |
Exceptions | |
---|---|
java.io.IOException |
if an I/O error occurs. |
java.io.IOException |
if an I/O error occurs. |
writeChar
fun writeChar(v: Int): Unit
Writes a char
to the file as a two-byte value, high byte first. The write starts at the current position of the file pointer.
Parameters | |
---|---|
v |
Int: a char value to be written. |
Exceptions | |
---|---|
java.io.IOException |
if an I/O error occurs. |
java.io.IOException |
if an I/O error occurs. |
writeChars
fun writeChars(s: String!): Unit
Writes a string to the file as a sequence of characters. Each character is written to the data output stream as if by the writeChar
method. The write starts at the current position of the file pointer.
Parameters | |
---|---|
s |
String!: a String value to be written. |
Exceptions | |
---|---|
java.io.IOException |
if an I/O error occurs. |
java.io.IOException |
if an I/O error occurs. |
writeDouble
fun writeDouble(v: Double): Unit
Converts the double argument to a long
using the doubleToLongBits
method in class Double
, and then writes that long
value to the file as an eight-byte quantity, high byte first. The write starts at the current position of the file pointer.
Parameters | |
---|---|
v |
Double: a double value to be written. |
Exceptions | |
---|---|
java.io.IOException |
if an I/O error occurs. |
java.io.IOException |
if an I/O error occurs. |
writeFloat
fun writeFloat(v: Float): Unit
Converts the float argument to an int
using the floatToIntBits
method in class Float
, and then writes that int
value to the file as a four-byte quantity, high byte first. The write starts at the current position of the file pointer.
Parameters | |
---|---|
v |
Float: a float value to be written. |
Exceptions | |
---|---|
java.io.IOException |
if an I/O error occurs. |
java.io.IOException |
if an I/O error occurs. |
writeInt
fun writeInt(v: Int): Unit
Writes an int
to the file as four bytes, high byte first. The write starts at the current position of the file pointer.
Parameters | |
---|---|
v |
Int: an int to be written. |
Exceptions | |
---|---|
java.io.IOException |
if an I/O error occurs. |
java.io.IOException |
if an I/O error occurs. |
writeLong
fun writeLong(v: Long): Unit
Writes a long
to the file as eight bytes, high byte first. The write starts at the current position of the file pointer.
Parameters | |
---|---|
v |
Long: a long to be written. |
Exceptions | |
---|---|
java.io.IOException |
if an I/O error occurs. |
java.io.IOException |
if an I/O error occurs. |
writeShort
fun writeShort(v: Int): Unit
Writes a short
to the file as two bytes, high byte first. The write starts at the current position of the file pointer.
Parameters | |
---|---|
v |
Int: a short to be written. |
Exceptions | |
---|---|
java.io.IOException |
if an I/O error occurs. |
java.io.IOException |
if an I/O error occurs. |
writeUTF
fun writeUTF(str: String!): Unit
Writes a string to the file using modified UTF-8 encoding in a machine-independent manner.
First, two bytes are written to the file, starting at the current file pointer, as if by the writeShort
method giving the number of bytes to follow. This value is the number of bytes actually written out, not the length of the string. Following the length, each character of the string is output, in sequence, using the modified UTF-8 encoding for each character.
Parameters | |
---|---|
s |
the string value to be written. |
str |
String!: a string to be written. |
Exceptions | |
---|---|
java.io.IOException |
if an I/O error occurs. |
java.io.IOException |
if an I/O error occurs. |
Protected methods
finalize
protected open fun finalize(): Unit
Exceptions | |
---|---|
java.lang.Throwable |
the Exception raised by this method |