If it's absolutely a mission critical requirement that a beep be
produced, then you'll have to ship custom hardware with your product. I have
a few computers, for example, with no speakers on them at all (not even the
"PC Speaker" normally attached to a motherboard), so it doesn't matter what
code you write in what language: no beep will be generated on these
machines.

   If it isn't that essential, then maybe you shouldn't worry too much
about beeps not being produced under some architectures using
"Toolkit.getDefaultToolkit().beep()".

   - Oliver

This should do what you need.

knute...

import javax.sound.sampled.*;

public class Tone {
    public static void sound(int hz,int msecs) throws
LineUnavailableException {
        byte[] buf = new byte[msecs*8];

        for (int i=0; i<buf.length; i++) {
            double angle = i / (8000.0 / hz) * 2.0 * Math.PI;
            buf[i] = (byte)(Math.sin(angle) * 80.0);
        }

        AudioFormat af = new AudioFormat(8000f,8,1,true,false);
        SourceDataLine sdl = AudioSystem.getSourceDataLine(af);
        sdl.open(af);
        sdl.start();
        sdl.write(buf,0,buf.length);
        sdl.drain();
        sdl.close();
    }

    public static void main(String[] args) {
        try {
            Tone.sound(2000,150);
        } catch (LineUnavailableException lue) {
            System.out.println(lue);
        }
    }
}

All it does is print the character value 7 to the terminal, which
interprets the character and rings the bell.

You can do it directly from Java like this:

 System.out.print('\0007');

Whether or not this actually creates any sound depends on your
terminal.

/gordon

there is one more thing easier to try. see
http://mindprod.com/jgloss/beep.html

See http://mindprod.com/jgloss/exec.html
if that does not work.  Echo may be an internal command. If it is you
will need to spawn a command interperter.  

Shade of Monty Python and the machine that goes beep.

I don't know about linux but under windows to execute we use

code1: -
----------------------------------------------
//import java.io.*;

public class RunExec
{
    public static void main(String args[])
    {
    String path="http://pradyut.tk";
    try
    {
        Process p = Runtime.getRuntime().exec("RunDLL32.EXE
shell32.dll,ShellExec_RunDLL " + path);
    }
    catch(Exception e )
    {
        System.err.println(e);
    }
    }
}
-------------------------------------------------------

code2: -
--------------------------------------------------------
public class RunExec1
{
    public static void main(String args[])
    {
    String path="http://pradyut.tk";
    try
    {
        Runtime.getRuntime().exec( "rundll32 url.dll,FileProtocolHandler
http://yahoo.com" );
    }
    catch(Exception e )
    {
        System.err.println(e);
    }
    }
}
--------------------------------------------------------------

thanks

Pradyut
http://pradyut.tk
http://spaces.msn.com/members/oop-edge/
http://groups-beta.google.com/group/oop_programming
India

I don't know about linux but under windows to execute we use

code1: -
----------------------------------------------
//import java.io.*;

public class RunExec
{
    public static void main(String args[])
    {
    String path="http://pradyut.tk";
    try
    {
        Process p = Runtime.getRuntime().exec("RunDLL32.EXE
shell32.dll,ShellExec_RunDLL " + path);
    }
    catch(Exception e )
    {
        System.err.println(e);
    }
    }
}
-------------------------------------------------------

code2: -
--------------------------------------------------------
public class RunExec1
{
    public static void main(String args[])
    {
    String path="http://pradyut.tk";
    try
    {
        Runtime.getRuntime().exec( "rundll32 url.dll,FileProtocolHandler
http://yahoo.com" );
    }
    catch(Exception e )
    {
        System.err.println(e);
    }
    }
}
--------------------------------------------------------------

thanks

Pradyut
http://pradyut.tk
http://spaces.msn.com/members/oop-edge/
http://groups-beta.google.com/group/oop_programming
India