How to restart a program from a method

I'm a beginner in Java and I am making a basic game for practice. I'm almost done, but I have one further obstacle to overcome.

I would like to know how to make the game loop on the game() method after pressing no as a choice when asked whether to end the game.

Here is my code:

private static void game() //game method
{
    //...

   int play = JOptionPane.showOptionDialog(null
                   ,"End"
                   , "Do you want to play again?"
                   , JOptionPane.PLAIN_MESSAGE
                   ,JOptionPane.DEFAULT_OPTION
                   , null
                   , again
                   , again[1]);
   //end of game

    if (play == 0)
        System.exit(0);//exit
    else
         /* what do I put here to restart the program in the same method(game()) 
            after pressing the No button on the JOptionPane???    */        
         System.out.println("Service not available");  

To anybody who can help, I thank you very much!

If you just want to make it work you can do something like this :

// Game method
private static void game() {
  boolean exit = false;
  while (!exit) {
    // int play = JOptionPane.showOptionDialog(null, "Play Again?", "Do you want to play again?", JOptionPane.PLAIN_MESSAGE, JOptionPane.DEFAULT_OPTION, null, again, again[1]);
    // End of game
    if (play == 0) {
      exit = true;
    }
  }
  // Exit 
  System.exit(0);
}

But a better more professional approach would be to refactor your code, so you extract game logic and separate it from User dialog interaction.