print binary strings withoout consecutive 1's

 //PRINT BINARY SGTRINGS WITHOUT CONSECUTIVE 1'S

public class printbin_strings {

    public static void print(int n, int lastplace, String str) {

        if (n == 0) {

            System.out.println(str);

            return;

        }

        print(n - 1, 0, str + "0");

        if (lastplace == 0) {

            print(n - 1, 1, str + "1");

        }

    }

    public static void main(String[] args) {

        print(3, 0, "");

    }

}