public class Exercise7_8 {    public static void main(String[] args) {        System.out.println(parseBinary("11111111"));    }        public static int parseBinary(String binaryString) {        int value = binaryString.charAt(0) - '0';        for (int i = 1; i < binaryString.length(); i++) {            value = value * 2 + binaryString.charAt(i) - '0';        }                return value;    }}