/* Dupe.java by Mark D. LaDue */

/* December 18, 1996 */

/*  Copyright (c) 1996 Mark D. LaDue
    You may study, use, modify, and distribute this example for any purpose.
    This example is provided WITHOUT WARRANTY either expressed or implied.  */

/*  This Java application is an example of a self-reproducing program, and
    as such it exhibits prototypical virus-like behavior.  To test it,
    at the command line proceed as follows:

    1. Type "java Dupe.java" to get Dupe.class.
    2. Move Dupe.class to an entirely different directory.
    3. In that different directory type "java Dupe" to run the application.
    4. Inspect the resulting output Dupe.java, which will be exactly the
       same as the original.

    In addition to reproducing itself, the application echoes a wisecrack
    to the standard output.  */

import java.io.*;
class Dupe {
    public static void main (String[] argv) {
int[] src1 = {
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        byte[] beginning = new byte[src1.length];
        for (int i=0; i<src1.length; i++) {
            beginning[i] = (byte) src1[i];
        }
        try {
        PrintStream outer = new PrintStream(new FileOutputStream("Dupe.java"));
        outer.write(beginning, 0, beginning.length);
        outer.write(105);
        outer.write(110);
        outer.write(116);
        outer.write(91);
        outer.write(93);
        outer.write(32);
        outer.write(115);
        outer.write(114);
        outer.write(99);
        outer.write(49);
        outer.write(32);
        outer.write(61);
        outer.write(32);
        outer.write(123);
        outer.write(10);
        for (int i=0; i<src1.length; i++) {
            outer.print(src1[i]);
            outer.write(44);
            outer.write(10);
        }
        outer.write(125);
        outer.write(59);
        outer.write(10);
        byte[] end = new byte[src2.length];
        for (int i=0; i<src2.length; i++) {
            end[i] = (byte) src2[i];
        }
        outer.write(105);
        outer.write(110);
        outer.write(116);
        outer.write(91);
        outer.write(93);
        outer.write(32);
        outer.write(115);
        outer.write(114);
        outer.write(99);
        outer.write(50);
        outer.write(32);
        outer.write(61);
        outer.write(32);
        outer.write(123);
        outer.write(10);
        for (int i=0; i<src2.length; i++) {
            outer.print(src2[i]);
            outer.write(44);
            outer.write(10);
        }
        outer.write(125);
        outer.write(59);
        outer.write(10);
        outer.write(end, 0, end.length);
        outer.close();
        } catch (IOException ioe) {}
        System.out.println("UNIX and Java viruses do not exist.");
    }
}