Java.io.RandomAccessFile Class Method | Set 2

Last Updated : 25 Jan, 2023

Set 1, Set 3 Methods of Java.io.RandomAccessFile Class Method :

readLine() : java.io.RandomAccessFile.readLine() reads the next line of text from this file, start reading from the File Pointer till the end of file.
```
Syntax : 
public final String readLine()
Parameters : 
-----
Return : 
reads the next line of text from this file
```
readUnsignedByte() : java.io.RandomAccessFile.readUnsignedByte() reads an unsigned 8 bit number from file, starts reading from the current File Pointer.
```
Syntax : 
public final int readUnsignedByte()
Parameters : 
------
Return : 
reads an unsigned 8 bit number from file
```
readUnsignedShort() : java.io.RandomAccessFile.readUnsignedShort() reads an unsigned 16 bit number from file, starts reading from the current File Pointer.
```
Syntax : 
public final int readUnsignedShort()
Parameters : 
-------
Return : 
reads an unsigned 16 bit number from file
```

readUTF() : java.io.RandomAccessFile.readUTF() reads in a string from the file

Syntax : 
public final String readUTF()
Parameters : 
-------
Return : 
Unicode String

seek(long pos) : java.io.RandomAccessFile.seek(long pos) sets File pointer position.

Syntax : 
public void seek(long pos)
Parameters : 
pos : start position from file, measured in bytes
Return : 
--------

setLength(long len) : java.io.RandomAccessFile.setLength(long len) sets length of the file.

Syntax : 
public void setLength(long len)
Parameters : 
len : desired length of the file
Return : 
-------

skipBytes(int n) :java.io.RandomAccessFile.skipBytes(int n) skip over n bytes, discarding the skipped bytes

Syntax : 
public int skipBytes(int n)
Parameters : 
n : no. of bytes to be skipped
Return : 
no. of bytes skipped

getChannel() : java.io.RandomAccessFile.getChannel() returns unique FileChannel object associated with file.

Syntax : 
public final FileChannel getChannel()
Parameters : 
------
Return : 
returns unique FileChannel object

java.io.RandomAccessFile.length() : returns length of the file.

Syntax : 
public long length()
Parameters : 
----
Return : 
length of the file, measured in bytes

getFilePointer() : java.io.RandomAccessFile.getFilePointer() return current offset in the file in bytes.

Syntax : 
public long getFilePointer()
Parameters : 
----
Return : 
return current offset in the file in bytes

getFD() : java.io.RandomAccessFile.getFD() returns file descriptor object with the stream.

Syntax : 
public final FileDescriptor getFD()
Parameters : 
-----------
Return : 
file descriptor object with the stream.

close() : java.io.RandomAccessFile.close() closes random access file stream and releases source associated with the stream, if any.
```
Syntax : 
public void close()
Parameters : 
-------
Return : 
-------
```

Java

// Java Program illustrating use of io.RandomAccessFile class methods
// seek(), readLine(), readUTF(), readUnsignedByte(), readUnsignedShort(),
// setLength(), length(), skipBytes(), getFilePointer(), getChannel(),
// getFD(), close()

import java.io.*;
public class NewClass
{
    public static void main(String[] args)
    {
        try
        {
            // Creating a new RandomAccessFile - "GEEK"
            RandomAccessFile geek = new RandomAccessFile("FILE.txt", "rw");

            // Writing to file
            geek.writeUTF("Hello Geeks For Geeks");

            geek.seek(0);

            // Use of readUTF() :
            System.out.println("Use of readUTF() : " + geek.readUTF());

            //Use of seek() :
            geek.seek(0);

            // Use of readLine() :
            System.out.println("1 readLine() : " + geek.readLine());
            geek.seek(0);

            geek.writeUTF("Hello \nGeeks For Geeks");
            geek.seek(0);

            System.out.println("2 readLine() : " + geek.readLine());

            geek.seek(3);
            // Use of readUnsignedByte() :
          System.out.println("Use of readUnsignedByte() :  " + geek.readUnsignedByte());

            geek.seek(4);
            // Use of readUnsignedShort() :
          System.out.println("Use of readUnsignedByte() :  " + geek.readUnsignedShort());

            // Use of setLength():
            geek.setLength(78);

            // Use of length() :
            System.out.println("Use of setLength() : " + geek.length());

            geek.seek(2);
            // Use of skipBytes() :
            System.out.println("Use of skipBytes() : " + geek.skipBytes(3));


            // Use of getFilePointer() :
            System.out.println("Use of getFilePointer() : " + geek.getFilePointer());

            // Use of getChannel() :
            System.out.println("Use of getChannel() : " + geek.getChannel());

            // Use of getFD() :
            System.out.println("Use of getFD() : " + geek.getFD());

            // Use of close() method :
            geek.close();
            System.out.println("Stream Closed.");

        }
        catch (IOException ex)
        {
            System.out.println("Something went Wrong");
            ex.printStackTrace();
        }
    }
}

Output :

Use of readUTF() : Hello Geeks For Geeks
1 readLine() : Hello Geeks For Geekss
2 readLine() : Hello
Use of readUnsignedByte() :  101
Use of readUnsignedByte() :  27756
Use of setLength() : 78
Use of skipBytes() : 3
Use of getFilePointer() : 5
Use of getChannel() : sun.nio.ch.FileChannelImpl@15db9742
Use of getFD() : java.io.FileDescriptor@6d06d69c
Stream Closed.

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Java.io.RandomAccessFile Class Method | Set 2

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