class Parameters {

    public static void swap_str(String a, String b) {
	String tmp = a;
	a = b;
	b = tmp;
    }

    public static void swap_int(int a, int b) {
	int tmp = a;
	a = b;
	b = tmp;
    }

    public static void main(String args[]) {
	String x = "ciao", y = "Pippo";
	String tmp;
	tmp = y;
	y = x;
	x = tmp;

	swap_str(x, y);
	System.out.println(x);  System.out.println(y);
	
	int i = 3, j = 7;
	swap_int(i, j);
	System.out.println(i);  System.out.println(j);
    }
}