Example usage for java.io RandomAccessFile RandomAccessFile

List of usage examples for java.io RandomAccessFile RandomAccessFile

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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  va2  s .c  om
        RandomAccessFile raf = new RandomAccessFile("c:\\temp\\RAFsample.txt", "rw");
        raf.writeInt(10);
        raf.writeInt(43);
        raf.writeInt(88);
        raf.writeInt(455);

        raf.seek((3 - 1) * 4);
        raf.writeInt(99);
        raf.seek(0);
        int i = raf.readInt();
        while (i != -1) {
            System.out.println(i);

            i = raf.readInt();
        }
        raf.close();
    } catch (IOException e) {
    }
}

From source file:Main.java

public static void main(String[] args) {
    try {/* w  w w.  j  ava  2s.c om*/
        double d = 1234.5678;

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

        raf.writeDouble(d);

        raf.seek(0);

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

        raf.seek(0);

        raf.writeDouble(123.4567);

        raf.seek(0);

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

}

From source file:Main.java

public static void main(String[] args) {
    try {//  w  w w  . ja va  2  s .c  om
        float f = 1234.5678f;

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

        raf.writeFloat(f);

        raf.seek(0);

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

        raf.seek(0);

        raf.writeFloat(123.4567f);

        raf.seek(0);

        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  w w  . j av a2  s  . c  om
        byte[] b1 = { 15, 8 };

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

        raf.writeByte(b1[0]);

        raf.seek(0);

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

        raf.seek(0);

        raf.writeByte(b1[1]);

        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 {/*  w ww .j ava  2  s  . c om*/
        byte[] b = { 1, 2, 3, 4, 5, 6 };

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

        // write 2 bytes in the file
        raf.write(b, 2, 2);

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

        // print the two bytes we wrote
        System.out.println(raf.readByte());
        System.out.println(raf.readByte());
        raf.close();
    } catch (IOException ex) {
        ex.printStackTrace();
    }

}

From source file:Main.java

public static void main(String[] args) {
    try {//from w  ww .  jav a 2s . co  m
        char c = 'J';

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

        // write something in the file
        raf.writeChar('A');

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

        // read char
        System.out.println(raf.readChar());

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

        // write a char at the start
        raf.writeChar(c);

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

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

}

From source file:MainClass.java

public static void main(String[] args) throws IOException {
    RandomAccessFile raf = new RandomAccessFile(new File("temp.tmp"), "rw");
    raf.writeInt(1);//from w  ww  .  j a  va 2 s .  c o  m
    for (int i = 0; i < 10; i++) {
        raf.seek(raf.length() - 4);
        raf.writeInt(raf.readInt());
    }
    raf.close();

}

From source file:Main.java

public static void main(String[] args) {
    try {//from  www. ja v a 2  s .c o  m
        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 .j  a v a  2 s .  c  om
        long f = 123456789909876L;

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

        raf.writeLong(f);

        raf.seek(0);

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

        raf.seek(0);

        raf.writeLong(20000000000l);

        raf.seek(0);

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

}

From source file:MainClass.java

public static void main(String[] args) {
    try {//  w  w w .  j a  v a2  s.com
        RandomAccessFile raf = new RandomAccessFile("c:\\temp\\RAFsample.txt", "rw");
        raf.writeInt(10);
        raf.writeInt(43);
        raf.writeInt(88);
        raf.writeInt(455);

        // change the 3rd integer from 88 to 99
        raf.seek((3 - 1) * 4);
        raf.writeInt(99);
        raf.seek(0); // go to the first integer
        int i = raf.readInt();
        while (i != -1) {
            System.out.println(i);

            i = raf.readInt();
        }
        raf.close();
    } catch (IOException e) {
    }
}