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Java - RandomAccessFile

This class is used for reading and writing to random access file. A random access file behaves like a large array of bytes. There is a cursor implied to the array called file pointer, by moving the cursor we do the read write operations. If end-of-file is reached before the desired number of byte has been read than EOFException is thrown. It is a type of IOException.

Constructor

Constructor Description
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.
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.

Method

Modifier and Type Method Method
void close() It closes this random access file stream and releases any system resources associated with the stream.
FileChannel getChannel() It returns the unique FileChannel object associated with this file.
int readInt() It reads a signed 32-bit integer from this file.
String readUTF() It reads in a string from this file.
void seek(long pos) It sets the file-pointer offset, measured from the beginning of this file, at which the next read or write occurs.
void writeDouble(double v) It 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.
void writeFloat(float v) It 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.
void write(int b) It writes the specified byte to this file.
int read() It reads a byte of data from this file.
long length() It returns the length of this file.
void seek(long pos) It sets the file-pointer offset, measured from the beginning of this file, at which the next read or write occurs.

Example

The myFile.TXT contains text "This class is used for reading and writing to random access file."

after running the program it will contains

This class is used for reading I love my country and my peoplele.


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