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public class Main {

	public static void ablRek(int[] a, int letztesB, int i){
		if(a.length == i) return;
		if (a[i] == 1)
			letztesB = (letztesB + 1) % 2;
		a[i] = letztesB;
		ablRek(a, letztesB, i + 1);
	}
	
	 public static void abl(int[] a){
		ablRek(a, a[0], 1);
	}
	
	public static void main(String[] args) {
		int[] a = {1, 1, 0, 1, 0, 0, 1, 1}; 
		System.out.print("a davor:   ");
		for(int j = 0; j < a.length; j++)
			System.out.print(a[j] + " ");
		abl(a);
		System.out.print("\na danach:  ");
		for(int j = 0; j < a.length; j++)
			System.out.print(a[j] + " ");
	}

	/*
	a davor:   1 1 0 1 0 0 1 1 
	a danach:  1 0 0 1 1 1 0 1 
	*/
}