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:Main.java

public static void main(String[] args) {
    try {//from  w  w w  .j  a v  a 2s  . com
        byte[] b = { 1 };

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

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

        System.out.println(raf.readByte());
        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. c o m

        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());

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

        // attempt to skip 10 bytes
        System.out.println(raf.skipBytes(10));

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

        // set the file pointer to position 8
        raf.seek(8);

        // attempt to skip 10 more bytes
        System.out.println(raf.skipBytes(10));
        raf.close();
    } catch (IOException ex) {
        ex.printStackTrace();
    }

}

From source file:Tail.java

public static void main(String args[]) throws Exception {
    RandomAccessFile raf = new RandomAccessFile(args[0], "r");
    long count = 10;
    long position = raf.length();
    position -= count;/* www .j a  va 2  s  .co m*/
    if (position < 0)
        position = 0;
    raf.seek(position);
    while (true) {
        try {
            byte b = raf.readByte();
            System.out.print((char) b);
        } catch (EOFException eofe) {
            break;
        }
    }
}

From source file:Main.java

public static void main(String[] args) throws IOException {
    RandomAccessFile raf = new RandomAccessFile("employee.dat", "rw");

    raf.writeUTF("J");
    raf.writeUTF("S");
    raf.writeDouble(4.0);//from w  ww  . java2s.c  o  m
    raf.seek(0L);
    String fname = raf.readUTF();
    String lname = raf.readUTF();
    double salary = raf.readDouble();
    System.out.println("First name = " + fname);
    System.out.println("Last name = " + lname);
    System.out.println("Salary = " + salary);
    raf.close();
}

From source file:Main.java

public static void main(String[] args) {
    try {//w w  w .ja  v  a2 s  .c om
        boolean b = true;
        RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw");

        raf.writeBoolean(false);

        raf.seek(0);

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

        raf.writeBoolean(b);

        raf.seek(1);

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

}

From source file:Main.java

public static void main(String[] args) {
    try {/*from   w  ww  .jav a2s .  c  o m*/
        int i = 70;

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

        raf.writeChar(i);

        raf.seek(0);

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

        raf.seek(0);

        raf.writeChar(71);

        raf.seek(0);

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

}

From source file:Main.java

public static void main(String[] args) {
    try {/*from ww w  .ja va2s.c o m*/
        short s = 15;

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

        raf.writeShort(s);

        raf.seek(0);

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

        raf.seek(0);

        raf.writeShort(20);

        raf.seek(0);

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

}

From source file:MainClass.java

public static void main(String[] args) throws IOException {
    RandomAccessFile rf = new RandomAccessFile("test.dat", "rw");
    for (int i = 0; i < 10; i++)
        rf.writeDouble(i * 1.414);/*from w  ww .  j  a  v a2 s .c  o  m*/
    rf.close();
    rf = new RandomAccessFile("test.dat", "rw");
    rf.seek(5 * 8);
    rf.writeDouble(47.0001);
    rf.close();
    rf = new RandomAccessFile("test.dat", "r");
    for (int i = 0; i < 10; i++)
        System.out.println("Value " + i + ": " + rf.readDouble());
    rf.close();

}

From source file:Main.java

public static void main(String[] args) {
    try {/*from   w w w.  j  a va  2 s . com*/
        int f = 1234;

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

        raf.writeInt(f);

        raf.seek(0);

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

        raf.seek(0);

        raf.writeInt(200);

        raf.seek(0);

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

}

From source file:RandomIOApp.java

public static void main(String args[]) throws IOException {
    RandomAccessFile file = new RandomAccessFile("test.txt", "rw");
    file.writeBoolean(true);/* ww  w.j  av  a 2s  . c  o  m*/
    file.writeInt(123456);
    file.writeChar('j');
    file.writeDouble(1234.56);
    file.seek(1);
    System.out.println(file.readInt());
    System.out.println(file.readChar());
    System.out.println(file.readDouble());
    file.seek(0);
    System.out.println(file.readBoolean());
    file.close();
}