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 .ja  va 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[] argv) throws Exception {

    RandomAccessFile raf = new RandomAccessFile("a.dat", "rw");
    int x, y;//  w w  w .j  av a 2  s.  c  o m

    for (long i = 0, j = raf.length() - 1; i < j; i++, j--) {
        raf.seek(i);
        x = raf.read();
        raf.seek(j);
        y = raf.read();

        raf.seek(j);
        raf.write(x);
        raf.seek(i);
        raf.write(y);

    }
    raf.close();
}

From source file:Main.java

public static void main(String[] args) {
    try {// w w  w  .j a  v  a2s .  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 5 position
        raf.seek(5);

        // write something in the file
        raf.writeUTF("This is an example from java2s.com");

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

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

}

From source file:Main.java

public static void main(String[] args) {
    try {/*from   w ww  .ja  v  a  2s  .  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 {//from w ww  . j a v a 2 s . co 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);

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

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

        raf.writeUTF("This is from java2s.com");

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

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

}

From source file:Main.java

public static void main(String args[]) throws Exception {
    RandomAccessFile fh1 = new RandomAccessFile("a.txt", "r");
    RandomAccessFile fh2 = new RandomAccessFile("b.txt", "r");
    long filesize1 = fh1.length();
    long filesize2 = fh2.length();
    // allocate two buffers large enough to hold entire files
    int bufsize = (int) Math.min(filesize1, filesize2);
    byte[] buffer1 = new byte[bufsize];
    byte[] buffer2 = new byte[bufsize];

    fh1.readFully(buffer1, 0, bufsize);//  w  w  w .ja  v  a 2s  . c o  m
    fh2.readFully(buffer2, 0, bufsize);

    for (int i = 0; i < bufsize; i++) {
        if (buffer1[i] != buffer2[i]) {
            System.out.println("Files differ at offset " + i);
            break;
        }
    }
    fh1.close();
    fh2.close();
}

From source file:Main.java

public static void main(String[] args) {
    try {//from w ww .jav a  2 s. co 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);

        // read byte
        System.out.println(raf.readByte());

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

        // write 0 at the start
        raf.write(0);

        // read byte
        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 w w  .  j  a  va2  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 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 {//from w w w .  j a v  a 2  s . 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);

        // read boolean
        System.out.println(raf.readBoolean());

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

        // write 0 at the start
        raf.write(0);

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

}

From source file:Main.java

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

    String books[] = new String[5];
    books[0] = "A";
    books[1] = "B";
    books[2] = "C";
    books[3] = "D";
    books[4] = "E";

    for (int i = 0; i < books.length; i++) {
        raf.writeUTF(books[i]);//from   w w w  .  j a va  2 s.  c o m
    }
    raf.seek(raf.length());
    raf.writeUTF("Servlet & JSP Programming");

    raf.seek(0);

    while (raf.getFilePointer() < raf.length()) {
        System.out.println(raf.readUTF());
    }
}