New to Java

Hi. I am new to Java and exception handling. I have the following program and need corrections to allow it to work.

This is what I want:

1) The user to enter a number

2) Display the number, but if the number is not a number , eg 's',

3) then the program must ask the user to re-enter the number until an actual integer is entered.

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import javax.swing.JOptionPane;

public class ExceptionHandling
{
public static void main (String[] args)
{
int num = 0;

try
{
String input = JOptionPane.showInputDialog("Please enter a number: ");
num = Integer.parseInt(input);

System.out.println("The number you entered is: " + num);

}
catch(Exception e)
{
// do not know what code to put here to make it return to the try....
}

}
}