Example usage for java.io RandomAccessFile seek

List of usage examples for java.io RandomAccessFile seek

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Introduction

In this page you can find the example usage for java.io RandomAccessFile seek.

Prototype

public void seek(long pos) throws IOException

Source Link

Document

Sets the file-pointer offset, measured from the beginning of this file, at which the next read or write occurs.

Usage

From source file:Main.java

public static void main(String[] args) {
    try {/*  w ww  . j ava2 s .c  o  m*/
        RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");

        // write something in the file
        raf.writeUTF("Hello World");

        // set the file pointer at 0 position
        raf.seek(0);

        // print the line
        System.out.println(raf.readLine());

        // set the file pointer at 0 position
        raf.seek(0);

        raf.writeUTF("This is an example \n Hello World");

        raf.seek(0);
        // print the line
        System.out.println(raf.readLine());
        raf.close();
    } catch (IOException ex) {
        ex.printStackTrace();
    }

}

From source file:Main.java

public static void main(String[] args) {
    try {// w  ww . ja  v  a 2s.  c om
        int i = 123;

        RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");

        // write something in the file
        raf.writeInt(123);

        // set the file pointer at 0 position
        raf.seek(0);

        // print the int
        System.out.println(raf.readInt());

        // set the file pointer at 0 position
        raf.seek(0);

        // write something in the file
        raf.writeInt(i);

        // set the file pointer at 0 position
        raf.seek(0);

        // print the int
        System.out.println(raf.readInt());
        raf.close();
    } catch (IOException ex) {
        ex.printStackTrace();
    }

}

From source file:Main.java

public static void main(String[] args) {
    try {/*from  ww  w  . ja  v  a  2s .  c om*/
        short s = 15000;

        RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");

        // write something in the file
        raf.writeShort(s);

        // set the file pointer at 0 position
        raf.seek(0);

        // print the short
        System.out.println(raf.readShort());

        // set the file pointer at 0 position
        raf.seek(0);

        // write something in the file
        raf.writeShort(134);

        // set the file pointer at 0 position
        raf.seek(0);

        // print the short
        System.out.println(raf.readShort());
        raf.close();
    } catch (IOException ex) {
        ex.printStackTrace();
    }

}

From source file:Main.java

public static void main(String[] args) {
    try {//  w w w  .j av  a  2  s  . co m
        float f = 1234.56f;

        RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");

        // write something in the file
        raf.writeFloat(987.654f);

        // set the file pointer at 0 position
        raf.seek(0);

        // read float
        System.out.println(raf.readFloat());

        // set the file pointer at 0 position
        raf.seek(0);

        // write a float
        raf.writeFloat(f);

        // set the file pointer at 0 position
        raf.seek(0);

        // read float
        System.out.println(raf.readFloat());
        raf.close();
    } catch (IOException ex) {
        ex.printStackTrace();
    }

}

From source file:Main.java

public static void main(String[] args) {
    try {/* w ww  .  jav  a  2 s  .c o  m*/

        RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");

        // write something in the file
        raf.writeUTF("java2s.com Hello World");

        // set the file pointer at 0 position
        raf.seek(0);

        // read the first byte and print it
        System.out.println(raf.read());

        // set the file pointer at 4rth position
        raf.seek(4);

        // read the first byte and print it
        System.out.println(raf.read());
        raf.close();
    } catch (IOException ex) {
        ex.printStackTrace();
    }

}

From source file:Main.java

public static void main(String[] args) {
    try {//  w  w w. j  av  a2s  .  c  o  m

        RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");

        // write something in the file
        raf.writeUTF("Hello World from java2s.com");

        // set the file pointer at 0 position
        raf.seek(0);

        // print the byte
        System.out.println(raf.readUnsignedByte());

        // set the file pointer at 7 position
        raf.seek(7);

        System.out.println(raf.readUnsignedByte());
        raf.close();
    } catch (IOException ex) {
        ex.printStackTrace();
    }

}

From source file:Main.java

public static void main(String[] args) {
    try {//from  w ww.j  a v  a  2  s  .  co  m
        byte[] b1 = { 1, 2, 3 };
        byte[] b2 = { 1, 2, 3, 4, 5, 6, 7, 8 };

        RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");

        // write something in the file
        raf.writeUTF("java2s.com Hello World");

        // set the file pointer at 0 position
        raf.seek(0);

        // read the first 8 bytes and print the number of bytes read
        System.out.println(raf.read(b1));

        // set the file pointer at 0 position
        raf.seek(0);

        // read the first 8 bytes and print the number of bytes read
        System.out.println(raf.read(b2));
        raf.close();
    } catch (IOException ex) {
        ex.printStackTrace();
    }

}

From source file:Main.java

public static void main(String[] args) {
    try {/* ww w.  j  a v a 2s.c o  m*/

        RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");

        // write something in the file
        raf.writeUTF("java2s.com Hello World");

        // set the file pointer at 0 position
        raf.seek(0);

        // read and print the contents of the file
        System.out.println(raf.readUTF());

        // print the length of the file
        System.out.println(raf.length());

        // write something more in the file
        raf.writeUTF("This is an example");

        // print the length of the file
        System.out.println(raf.length());
        raf.close();
    } catch (IOException ex) {
        ex.printStackTrace();
    }

}

From source file:Main.java

public static void main(String[] args) {
    try {/*www  .  j ava  2  s. com*/
        byte[] b1 = { 1, 2, 3 };
        byte[] b2 = { 1, 2, 3, 4, 5, 6, 7, 8 };

        RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");

        // write something in the file
        raf.writeUTF("Hello World from java2s.com");

        // set the file pointer at 0 position
        raf.seek(0);

        // read 2 bytes, starting from 1
        System.out.println(raf.read(b1, 1, 2));

        // set the file pointer at 0 position
        raf.seek(0);

        // read 3 bytes, starting from 4rth
        System.out.println(raf.read(b2, 4, 3));
        raf.close();
    } catch (IOException ex) {
        ex.printStackTrace();
    }

}

From source file:Main.java

public static void main(String[] args) {
    try {//  w  w w .j  a v  a  2  s.  com
        // create a new RandomAccessFile with filename Example
        RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");

        // write something in the file
        raf.writeUTF("java2s.com Hello World");

        // set the file pointer at 0 position
        raf.seek(0);

        // read and print the contents of the file
        System.out.println(raf.readUTF());

        // return the file pointer
        System.out.println(raf.getFilePointer());

        // change the position of the file pointer
        raf.seek(5);

        // return the file pointer
        System.out.println(raf.getFilePointer());

        // close the strea and release resources
        raf.close();
    } catch (IOException ex) {
        ex.printStackTrace();
    }

}