Diferent ways of calculating the fibonacci sequence

fibo.java

public class funciones {
	public static void main (String args[]) {
		
		
		
		long start = System.currentTimeMillis();
		fibonacci();
		long elapsedTimeMillis = System.currentTimeMillis()-start;
        float elapsedTimeSec = elapsedTimeMillis/1000F;
        System.out.println(elapsedTimeSec);
	
	
	
	
	}
	
	public static  void fibonacci (long maximo) {
		long numeroActual = 2;
		long numeroAnterior = 1;
		long numeroFuturo = 0;
		for (long x=2;x<maximo;x++) {
			if (x != 2)
				numeroAnterior = numeroActual;
				numeroActual = numeroFuturo;
			numeroFuturo = numeroActual + numeroAnterior;
			//System.out.println(numeroFuturo);
		}
	}
	
	public static void fibonacci () {
		// MANU
		long x = 0;
		long y = 1;
		for (long a=1;a<100000000;a++){
			if (a%2==0){
				x=x+y;
				//System.out.println(x);
			}else{
				y=x+y;
				//System.out.println(y);
			}
		}
	}
	


	
}