A Java program that runs automatically at a given time of day

Okay Iam at the ending stages of a Java Assignment that is a MySql database, Hibernate for Mapping with a Java Server Faces front-end. All I need to do now is send emails at set time every week. Normally I know what to search for but frankly Iam stumped. Iam really just looking for a starting point for something that can run a Java Program at a set time of the week. PS my OS is Ubuntu if that is relevant but I was hoping for something that isn't platform specific so that it is portable.
Cheers in advance.

You can use the possibilities of your operating system, in this case Ubuntu.
Just drop a shell script that runs your java program in the /etc/cron.weekly directory.
--janeiros

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Here're some notes:
1)If I didn't call
jvmpi_interface->EnableEvent(JVMPI_EVENT_OBJECT_ALLOC, NULL);
in "start()" function, the java program Test ran properly after I sent signal to the process by using kill command in an command line;
or
2) If I delete "Thread.sleep(1000)" in Test.java, then whether I call
jvmpi_interface->EnableEvent(JVMPI_EVENT_OBJECT_ALLOC, NULL);
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How to make a Java program that recognises a function of two variables to assign values to that?
First I will give an example and then do the question.
Ex1.
We have any function, eg.y = x ^ 2 + 1 (read 'y' equals 'x' high to the square), a function of the second degree.
To build the graph of this function attach values to 'x' to find the values of 'y'
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We can use any numbers, but arfer interval [-3.3]
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-2 | Y = (-2) ^ 2 +1 = 5
-1 | Y = (-1) ^ 2 +1 = 2
0 | y = (0) ^ 2 +1 = 1
1 | y = (1) ^ 2 +1 = 2
2 | y = (2) ^ 2 +1 = 5
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Tabem that can be represented by a table:
X | y
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-2 | Y = 5
-1 | Y = 2
0 | y = 1
1 | y = 2
2 | y = 5
3 | y = 10
Now I begin to explain my doubts.
See this program:
Ex2
* To change this template, choose Tools | Templates
* And open the template in the editor.
Encontrando_o_valor_de_y package;
* @ Author des Soldat Gottes
Import javax.swing.JOptionPane;
Public class (Main
* @ Param args the command line arguments
Public static void main (String [] args) (
Int x, y;
String x1;
X1 = JOptionPane.showInputDialog ( "We have the function y = x + 1 \ n" +
"Assign a value for 'x',"); / / receives a value for the function y = x + 1
X = Integer.parseInt (x1); / / tranforma String in int
Y = x + 1; / / receives the value of 'x' and calculates' y '
JOptionPane.showMessageDialog (null, "The value of 'y' is: \ t \ t" + y);
/ / Displays the value of 'y'
System.exit (0);
We see that the program receives above a value for 'x' and replaces the function contained in the program, y = x + 1, and so is the value of the variable 'y'.
In: x1 = JOptionPane.showInputDialog ( "We have the function y = x + 1 \ n" +
"Assign a value for 'x',");
The entry is a number and that number is assigned aa ja existing function in the (y = x + 1).
The question is: would it be possible to come to a function?
Ex: the program ask: DIGITE THE FUNCTION?
The USUARIO DIGITARIA A FUNCTION ANY, TYPE: y = x ^ 2 +1
The program would recognize the function and give numerical values to that function as Ex1, at the beginning of this text.
And then to find the values of the x and y launch a table.
It would be possible that?
By invez of entering with a number so that the program sustitua a function ja existing as Ex2, seen above, entering with a function quaquer (type: y = x ^ 2 +1) for the program atribuisse values to that function and then create a table of values as Ex1.
I hope it has been easier to understand my doubts now.
Thank you for your attention!
God bless!

rafaelmenezes wrote:
Thanks for the explanation, could understand what fly said.
But as it applied to a program?
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san.kumar wrote:
it is like this
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hi,
i have two queries,
1) i have a c program which i compile to get a new
file,{a exe file i suppose}, i need to execute it for
2000 times. for that i need to write a java program
which can run the file in SHELL unix.
can you suggest me how to write,Read this: http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html
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>
2) also my file name starts with 0001.mnp to
1989.mnp, how to get 0001 as a number and during
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the above java program which am goin to write should
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A Java program that runs automatically at a given time of day

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