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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » java.io 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   java.io.RandomAccessFile

RandomAccessFile
public class RandomAccessFile implements DataOutput,DataInput(Code)
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.
author:
   unascribed
version:
   1.57, 05/03/00
since:
   JDK1.0




Constructor Summary
public  RandomAccessFile(String name, String mode)
     Creates a random access file stream to read from, and optionally to write to, a file with the specified name.
public  RandomAccessFile(File file, String mode)
     Creates a random access file stream to read from, and optionally to write to, the file specified by the File argument.

Method Summary
public  voidclose()
     Closes this random access file stream and releases any system resources associated with the stream.
final public  FileDescriptorgetFD()
     Returns the opaque file descriptor object associated with this stream.
native public  longgetFilePointer()
     Returns the current offset in this file.
native public  longlength()
     Returns the length of this file.
native public  intread()
     Reads a byte of data from this file.
public  intread(byte b, int off, int len)
     Reads up to len bytes of data from this file into an array of bytes.
public  intread(byte b)
     Reads up to b.length bytes of data from this file into an array of bytes.
final public  booleanreadBoolean()
     Reads a boolean from this file.
final public  bytereadByte()
     Reads a signed eight-bit value from this file.
final public  charreadChar()
     Reads a Unicode character from this file.
final public  doublereadDouble()
     Reads a double from this file.
final public  floatreadFloat()
     Reads a float from this file.
final public  voidreadFully(byte b)
     Reads b.length bytes from this file into the byte array, starting at the current file pointer.
final public  voidreadFully(byte b, int off, int len)
     Reads exactly len bytes from this file into the byte array, starting at the current file pointer.
final public  intreadInt()
     Reads a signed 32-bit integer from this file.
final public  StringreadLine()
     Reads the next line of text from this file.
final public  longreadLong()
     Reads a signed 64-bit integer from this file.
final public  shortreadShort()
     Reads a signed 16-bit number from this file.
final public  StringreadUTF()
     Reads in a string from this file.
final public  intreadUnsignedByte()
     Reads an unsigned eight-bit number from this file.
final public  intreadUnsignedShort()
     Reads an unsigned 16-bit number from this file.
native public  voidseek(long pos)
     Sets the file-pointer offset, measured from the beginning of this file, at which the next read or write occurs.
native public  voidsetLength(long newLength)
     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.

public  intskipBytes(int n)
     Attempts to skip over n bytes of input discarding the skipped bytes.
native public  voidwrite(int b)
     Writes the specified byte to this file.
public  voidwrite(byte b)
     Writes b.length bytes from the specified byte array to this file, starting at the current file pointer.
public  voidwrite(byte b, int off, int len)
     Writes len bytes from the specified byte array starting at offset off to this file.
final public  voidwriteBoolean(boolean v)
     Writes a boolean to the file as a one-byte value.
final public  voidwriteByte(int v)
     Writes a byte to the file as a one-byte value.
final public  voidwriteBytes(String s)
     Writes the string to the file as a sequence of bytes.
final public  voidwriteChar(int v)
     Writes a char to the file as a two-byte value, high byte first.
final public  voidwriteChars(String s)
     Writes a string to the file as a sequence of characters.
final public  voidwriteDouble(double v)
     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.
final public  voidwriteFloat(float v)
     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.
final public  voidwriteInt(int v)
     Writes an int to the file as four bytes, high byte first.
final public  voidwriteLong(long v)
     Writes a long to the file as eight bytes, high byte first.
final public  voidwriteShort(int v)
     Writes a short to the file as two bytes, high byte first.
final public  voidwriteUTF(String str)
     Writes a string to the file using UTF-8 encoding in a machine-independent manner.


Constructor Detail
RandomAccessFile
public RandomAccessFile(String name, String mode) throws FileNotFoundException(Code)
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 - the system-dependent filename
Parameters:
  mode - the access mode
exception:
  IllegalArgumentException - if the mode argument is not equalto one of "r", "rw", "rws", or"rwd"
exception:
  FileNotFoundException - if the file exists but is a directoryrather than a regular file, or cannot be opened orcreated for any other reason
exception:
  SecurityException - if a security manager exists and itscheckRead method denies read access to the fileor the mode is "rw" and the security manager'scheckWrite method denies write access to the file
See Also:   java.lang.SecurityException
See Also:   java.lang.SecurityManager.checkRead(java.lang.String)
See Also:   java.lang.SecurityManager.checkWrite(java.lang.String)




RandomAccessFile
public RandomAccessFile(File file, String mode) throws FileNotFoundException(Code)
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 java.io.IOException 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.
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 - the file object
Parameters:
  mode - the access mode, as described
above
exception:
  IllegalArgumentException - if the mode argument is not equalto one of "r", "rw", "rws", or"rwd"
exception:
  FileNotFoundException - if the file exists but is a directoryrather than a regular file, or cannot be opened orcreated for any other reason
exception:
  SecurityException - if a security manager exists and itscheckRead method denies read access to the fileor the mode is "rw" and the security manager'scheckWrite method denies write access to the file
See Also:   java.lang.SecurityManager.checkRead(java.lang.String)
See Also:   java.lang.SecurityManager.checkWrite(java.lang.String)





Method Detail
close
public void close() throws IOException(Code)
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.
exception:
  IOException - if an I/O error occurs.



getFD
final public FileDescriptor getFD() throws IOException(Code)
Returns the opaque file descriptor object associated with this stream.

the file descriptor object associated with this stream.
exception:
  IOException - if an I/O error occurs.
See Also:   java.io.FileDescriptor



getFilePointer
native public long getFilePointer() throws IOException(Code)
Returns the current offset in this file. the offset from the beginning of the file, in bytes,at which the next read or write occurs.
exception:
  IOException - if an I/O error occurs.



length
native public long length() throws IOException(Code)
Returns the length of this file. the length of this file, measured in bytes.
exception:
  IOException - if an I/O error occurs.



read
native public int read() throws IOException(Code)
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. the next byte of data, or -1 if the end of thefile has been reached.
exception:
  IOException - if an I/O error occurs. Not thrown if end-of-file has been reached.




read
public int read(byte b, int off, int len) throws IOException(Code)
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 the exactly the same way as the InputStream.read(byte[]intint) method of InputStream.
Parameters:
  b - the buffer into which the data is read.
Parameters:
  off - the start offset of the data.
Parameters:
  len - the maximum number of bytes read. the total number of bytes read into the buffer, or-1 if there is no more data because the end ofthe file has been reached.
exception:
  IOException - if an I/O error occurs.




read
public int read(byte b) throws IOException(Code)
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 the exactly the same way as the InputStream.read(byte[]) method of InputStream.
Parameters:
  b - the buffer into which the data is read. the total number of bytes read into the buffer, or-1 if there is no more data because the end ofthis file has been reached.
exception:
  IOException - if an I/O error occurs.




readBoolean
final public boolean readBoolean() throws IOException(Code)
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. the boolean value read.
exception:
  EOFException - if this file has reached the end.
exception:
  IOException - if an I/O error occurs.



readByte
final public byte readByte() throws IOException(Code)
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. the next byte of this file as a signed eight-bitbyte.
exception:
  EOFException - if this file has reached the end.
exception:
  IOException - if an I/O error occurs.




readChar
final public char readChar() throws IOException(Code)
Reads a Unicode 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. the next two bytes of this file as a Unicode character.
exception:
  EOFException - if this file reaches the end before readingtwo bytes.
exception:
  IOException - if an I/O error occurs.




readDouble
final public double readDouble() throws IOException(Code)
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. the next eight bytes of this file, interpreted as adouble.
exception:
  EOFException - if this file reaches the end before readingeight bytes.
exception:
  IOException - if an I/O error occurs.
See Also:   java.io.RandomAccessFile.readLong
See Also:   java.lang.Double.longBitsToDouble(long)




readFloat
final public float readFloat() throws IOException(Code)
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. the next four bytes of this file, interpreted as afloat.
exception:
  EOFException - if this file reaches the end before readingfour bytes.
exception:
  IOException - if an I/O error occurs.
See Also:   java.io.RandomAccessFile.readInt
See Also:   java.lang.Float.intBitsToFloat(int)




readFully
final public void readFully(byte b) throws IOException(Code)
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 - the buffer into which the data is read.
exception:
  EOFException - if this file reaches the end before readingall the bytes.
exception:
  IOException - if an I/O error occurs.



readFully
final public void readFully(byte b, int off, int len) throws IOException(Code)
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 - the buffer into which the data is read.
Parameters:
  off - the start offset of the data.
Parameters:
  len - the number of bytes to read.
exception:
  EOFException - if this file reaches the end before readingall the bytes.
exception:
  IOException - if an I/O error occurs.



readInt
final public int readInt() throws IOException(Code)
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. the next four bytes of this file, interpreted as anint.
exception:
  EOFException - if this file reaches the end before readingfour bytes.
exception:
  IOException - if an I/O error occurs.




readLine
final public String readLine() throws IOException(Code)
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 ('\r'), a newline character ('\n'), 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. the next line of text from this file, or null if endof file is encountered before even one byte is read.
exception:
  IOException - if an I/O error occurs.




readLong
final public long readLong() throws IOException(Code)
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. the next eight bytes of this file, interpreted as along.
exception:
  EOFException - if this file reaches the end before readingeight bytes.
exception:
  IOException - if an I/O error occurs.




readShort
final public short readShort() throws IOException(Code)
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. the next two bytes of this file, interpreted as a signed16-bit number.
exception:
  EOFException - if this file reaches the end before readingtwo bytes.
exception:
  IOException - if an I/O error occurs.




readUTF
final public String readUTF() throws IOException(Code)
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 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. a Unicode string.
exception:
  EOFException - if this file reaches the end beforereading all the bytes.
exception:
  IOException - if an I/O error occurs.
exception:
  UTFDataFormatException - if the bytes do not represent valid UTF-8 encoding of a Unicode string.
See Also:   java.io.RandomAccessFile.readUnsignedShort




readUnsignedByte
final public int readUnsignedByte() throws IOException(Code)
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. the next byte of this file, interpreted as an unsignedeight-bit number.
exception:
  EOFException - if this file has reached the end.
exception:
  IOException - if an I/O error occurs.




readUnsignedShort
final public int readUnsignedShort() throws IOException(Code)
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. the next two bytes of this file, interpreted as an unsigned16-bit integer.
exception:
  EOFException - if this file reaches the end before readingtwo bytes.
exception:
  IOException - if an I/O error occurs.




seek
native public void seek(long pos) throws IOException(Code)
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 - the offset position, measured in bytes from the beginning of the file, at which to set the file pointer.
exception:
  IOException - if pos is less than 0 or if an I/O error occurs.



setLength
native public void setLength(long newLength) throws IOException(Code)
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 then 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 - The desired length of the file
exception:
  IOException - If an I/O error occurs
since:
   1.2




skipBytes
public int skipBytes(int n) throws IOException(Code)
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 - the number of bytes to be skipped. the actual number of bytes skipped.
exception:
  IOException - if an I/O error occurs.




write
native public void write(int b) throws IOException(Code)
Writes the specified byte to this file. The write starts at the current file pointer.
Parameters:
  b - the byte to be written.
exception:
  IOException - if an I/O error occurs.



write
public void write(byte b) throws IOException(Code)
Writes b.length bytes from the specified byte array to this file, starting at the current file pointer.
Parameters:
  b - the data.
exception:
  IOException - if an I/O error occurs.



write
public void write(byte b, int off, int len) throws IOException(Code)
Writes len bytes from the specified byte array starting at offset off to this file.
Parameters:
  b - the data.
Parameters:
  off - the start offset in the data.
Parameters:
  len - the number of bytes to write.
exception:
  IOException - if an I/O error occurs.



writeBoolean
final public void writeBoolean(boolean v) throws IOException(Code)
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 - a boolean value to be written.
exception:
  IOException - if an I/O error occurs.



writeByte
final public void writeByte(int v) throws IOException(Code)
Writes a byte to the file as a one-byte value. The write starts at the current position of the file pointer.
Parameters:
  v - a byte value to be written.
exception:
  IOException - if an I/O error occurs.



writeBytes
final public void writeBytes(String s) throws IOException(Code)
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 - a string of bytes to be written.
exception:
  IOException - if an I/O error occurs.



writeChar
final public void writeChar(int v) throws IOException(Code)
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 - a char value to be written.
exception:
  IOException - if an I/O error occurs.



writeChars
final public void writeChars(String s) throws IOException(Code)
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 - a String value to be written.
exception:
  IOException - if an I/O error occurs.
See Also:   java.io.RandomAccessFile.writeChar(int)



writeDouble
final public void writeDouble(double v) throws IOException(Code)
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 - a double value to be written.
exception:
  IOException - if an I/O error occurs.
See Also:   java.lang.Double.doubleToLongBits(double)



writeFloat
final public void writeFloat(float v) throws IOException(Code)
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 - a float value to be written.
exception:
  IOException - if an I/O error occurs.
See Also:   java.lang.Float.floatToIntBits(float)



writeInt
final public void writeInt(int v) throws IOException(Code)
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 - an int to be written.
exception:
  IOException - if an I/O error occurs.



writeLong
final public void writeLong(long v) throws IOException(Code)
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 - a long to be written.
exception:
  IOException - if an I/O error occurs.



writeShort
final public void writeShort(int v) throws IOException(Code)
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 - a short to be written.
exception:
  IOException - if an I/O error occurs.



writeUTF
final public void writeUTF(String str) throws IOException(Code)
Writes a string to the file using 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 UTF-8 encoding for each character.
Parameters:
  str - a string to be written.
exception:
  IOException - if an I/O error occurs.




Methods inherited from java.lang.Object
public boolean equals(Object obj)(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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