private String binary;

private int decimal;

public Binary(String binary) {

this.binary = binary;

this.decimal = getDecimalFromBinary(binary);

}

public int getDecimal() {

return decimal;

}

private static int getDecimalFromBinary(String binary) {

if (!isValid(binary)) {

return 0;

}

int sum = 0;

for (int i = 0; i < binary.length(); i++) {

sum += Character.getNumericValue(binary.charAt(i)) * (int) Math.pow(2, binary.length() - i - 1);

}

return sum;

}

private static boolean isValid(String binaryRepresentation) {

boolean isValid = binaryRepresentation.chars()

.allMatch(x -> Character.isDigit((char) x) && Character.getNumericValue((char) x) < 2);

return isValid;

}