fib seq. in java

public class Main {
    public static void main(String[] args) {

        //Main variables
        long variNull = 0l;
        long variEins = 1l;
        long variZwei = 0l;
        int i = 0;
        int x = 0;
        //goal, procid fib seq.
/*
0, 1, 2
3, 5, 8
13, 21, 34
*/
        do {
            //math
            i++;
            variZwei = variNull + variEins;

            //prints the seq.
            System.out.println(variZwei);

            //changes variables
        switch(x)
                {
                    case 0:
                    x++;
                    variNull = variZwei;
                break;

                    case 1:
                    x--;
                    variEins = variZwei;
                break;

   }
  } while (i < 45);
 }
}