Binnary

package maricka.kolokolova;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		System.out.println("Please input binnary number:");
		String str = sc.nextLine();
		int a;
		if (isBinnary(str) == 1) {
			a = Integer.parseInt(str, 2);
			System.out.println("Result: \"" + str + "\" -> " + a);
		} else {
			System.out.println("Your number is not binary");
		}
		sc.close();
	}

	static int isBinnary(String str) {
		int res = 0;
		char[] st = str.toCharArray();
		for (int i = 0; i < st.length; i++) {
			if (st[i] == '1' || st[i] == '0') {
				res = 1;
			} else {
				res = -1;
				break;
			}
		}
		return res;
	}
}