Private Static Void Print Section

I have problems with private static void print section, something is missing? And in case 4, I want it to stop the program(end the loop) but it keeps going.

import java.util.Scanner;
import java.util.ArrayList;
public class Dogregister16 {
public static ArrayList<Dog> dogregister = new ArrayList();
private static Scanner keyboard = new Scanner(System.in);
public static void main(String[] args) {
initiate();

[Code] ....

case 4:
System.exit(0);
System.out.println("Exit program");
}
}
}
}