Added in API level 1

RandomAccessFile

open class RandomAccessFile : Closeable, DataInput, DataOutput

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(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.
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.

Public methods
open Unit	close() Closes this random access file stream and releases any system resources associated with the stream.
FileChannel!	getChannel() Returns the unique FileChannel object associated with this file.
FileDescriptor!	getFD() Returns the opaque file descriptor object associated with this stream.
open Long	getFilePointer() 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	read(b: ByteArray!) Reads up to b.length bytes of data from this file into an array of bytes.
open Int	read(b: ByteArray!, off: Int, len: Int) Reads up to len bytes of data from this file into an array of bytes.
Boolean	readBoolean() Reads a boolean from this file.
Byte	readByte() Reads a signed eight-bit value from this file.
Char	readChar() Reads a character from this file.
Double	readDouble() Reads a double from this file.
Float	readFloat() Reads a float from this file.
Unit	readFully(b: ByteArray!) Reads b.length bytes from this file into the byte array, starting at the current file pointer.
Unit	readFully(b: ByteArray!, off: Int, len: Int) Reads exactly len bytes from this file into the byte array, starting at the current file pointer.
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	readShort() Reads a signed 16-bit number from this file.
String!	readUTF() Reads in a string from this file.
Int	readUnsignedByte() Reads an unsigned eight-bit number from this file.
Int	readUnsignedShort() Reads an unsigned 16-bit number from this file.
open Unit	seek(pos: Long) Sets the file-pointer offset, measured from the beginning of this file, at which the next read or write occurs.
open Unit	setLength(newLength: Long) Sets the length of this file.
open Int	skipBytes(n: Int) Attempts to skip over n bytes of input discarding the skipped bytes.
open Unit	write(b: ByteArray!) Writes b.length bytes from the specified byte array to this file, starting at the current file pointer.
open Unit	write(b: ByteArray!, off: Int, len: Int) Writes len bytes from the specified byte array starting at offset off to this file.
open Unit	write(b: Int) Writes the specified byte to this file.
Unit	writeBoolean(v: Boolean) Writes a boolean to the file as a one-byte value.
Unit	writeByte(v: Int) Writes a byte to the file as a one-byte value.
Unit	writeBytes(s: String!) Writes the string to the file as a sequence of bytes.
Unit	writeChar(v: Int) Writes a char to the file as a two-byte value, high byte first.
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 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.
Unit	writeFloat(v: Float) 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.
Unit	writeInt(v: Int) Writes an int to the file as four bytes, high byte first.
Unit	writeLong(v: Long) Writes a long to the file as eight bytes, high byte first.
Unit	writeShort(v: Int) Writes a short to the file as two bytes, high byte first.
Unit	writeUTF(str: String!) Writes a string to the file using modified UTF-8 encoding in a machine-independent manner.

Protected methods
open Unit	finalize()

Public constructors

RandomAccessFile

Added in API level 1

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.

The "rws" and "rwd" modes work much like the 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

See Also

• java.lang.SecurityManager#checkRead(java.lang.String)
• java.lang.SecurityManager#checkWrite(java.lang.String)
• java.nio.channels.FileChannel#force(boolean)

RandomAccessFile

Added in API level 1

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

See Also

• java.lang.SecurityException
• java.lang.SecurityManager#checkRead(java.lang.String)
• java.lang.SecurityManager#checkWrite(java.lang.String)

Public methods

close

Added in API level 1

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

Added in API level 1

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

Added in API level 1

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

• java.io.FileDescriptor

getFilePointer

Added in API level 1

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

Added in API level 1

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

Added in API level 1

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

Added in API level 1

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.

read

Added in API level 1

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

readBoolean

Added in API level 1

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

Added in API level 1

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

Added in API level 1

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

Added in API level 1

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.

See Also

• java.io.RandomAccessFile#readLong()
• java.lang.Double#longBitsToDouble(long)

readFloat

Added in API level 1

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.

See Also

• java.io.RandomAccessFile#readInt()
• java.lang.Float#intBitsToFloat(int)

readFully

Added in API level 1

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

Added in API level 1

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

Added in API level 1

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

Added in API level 1

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

Added in API level 1

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

Added in API level 1

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

Added in API level 1

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.

See Also

• java.io.RandomAccessFile#readUnsignedShort()

readUnsignedByte

Added in API level 1

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

Added in API level 1

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

Added in API level 1

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

Added in API level 1

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

Added in API level 1

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

Added in API level 1

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

Added in API level 1

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.

write

Added in API level 1

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.

writeBoolean

Added in API level 1

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

Added in API level 1

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

Added in API level 1

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

Added in API level 1

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

Added in API level 1

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.

See Also

• java.io.RandomAccessFile#writeChar(int)

writeDouble

Added in API level 1

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.

See Also

• java.lang.Double#doubleToLongBits(double)

writeFloat

Added in API level 1

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.

See Also

• java.lang.Float#floatToIntBits(float)

writeInt

Added in API level 1

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

Added in API level 1

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

Added in API level 1

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

Added in API level 1

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

Added in API level 1

protected open fun finalize(): Unit

Exceptions
java.lang.Throwable	the Exception raised by this method