Example usage for java.io RandomAccessFile RandomAccessFile

Introduction

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

Prototype

public RandomAccessFile(File file, String mode) throws FileNotFoundException

Source Link

Document

Creates a random access file stream to read from, and optionally to write to, the file specified by the File argument.

Usage

From source file:ReverseFile.java

public static void main(String args[]) throws Exception {
    RandomAccessFile raf = new RandomAccessFile(args[0], "r");
    long position = raf.length();
    while (position > 0) {
        position -= 1;// w  ww.j a  v a  2 s.  c  o m
        raf.seek(position);
        byte b = raf.readByte();
        System.out.print((char) b);
    }
}

From source file:Main.java

public static void main(String[] args) {
    try {// w  w  w.ja  v  a 2  s  .c  om

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

        raf.writeUTF("java2s.com");

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

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

        // close the strea and release resources
        raf.close();

    } catch (IOException ex) {
        ex.printStackTrace();
    }
}

From source file:Main.java

public static void main(String[] args) {
    try {/*from  ww w . ja va 2 s . c om*/
        RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");

        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 channel of the file
        System.out.println(raf.getChannel());

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

From source file:Main.java

public static void main(String[] args) {
    try {//from w  w  w .j  a v  a2s . c o m
        RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");

        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 descriptor of the stream
        System.out.println(raf.getFD());

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

}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    RandomAccessFile file = new RandomAccessFile("scores.html", "rw");
    for (int i = 1; i <= 6; i++) {
        System.out.println(file.readLine());
    }/*from   w  w  w  .j  a v  a 2 s.c o  m*/
    long current = file.getFilePointer();
    file.seek(current + 6);
    file.write("34".getBytes());
    for (int i = 1; i <= 5; i++) {
        System.out.println(file.readLine());
    }
    current = file.getFilePointer();
    file.seek(current + 6);
    file.write("27".getBytes());
    file.close();
}

From source file:Main.java

public static void main(String[] args) {
    try {//from  w w w  .  j a va 2s .  c  om

        RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");
        raf.writeUTF("Hello World from java2s.com");

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

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

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

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

}

From source file:Main.java

public static void main(String[] args) {
    try {//from w ww. j  av a 2s .  co  m
        RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");

        raf.writeBytes("Hello World from java2s.com");

        raf.seek(0);

        System.out.println(raf.readLine());

        raf.seek(0);

        raf.writeBytes("This is an example from java2s.com");

        raf.seek(0);

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

}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    RandomAccessFile file = new RandomAccessFile(new File("scores.html"), "rw");
    for (int i = 1; i <= 6; i++) {
        System.out.println(file.readLine());
    }//w  w w . j  av  a  2 s.  c  o  m
    file.close();
}

From source file:Main.java

public static void main(String[] args) {
    try {/* ww  w.ja v  a2 s  .com*/

        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 {/*  ww w. j a v  a2 s  .  com*/
        RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");

        raf.writeUTF("Hello World from java2s.com");

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

        // print the string
        System.out.println(raf.readUTF());

        // print current length
        System.out.println(raf.length());

        // set the file length to 30
        raf.setLength(30);

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

}