没有预定义方法的二进制到十六进制(JAVA)

public class BinaryToHexadecimal {
    public static void main(String[] args) {
        int binaryNumber = 10; // 二进制数
        String binaryString = Integer.toBinaryString(binaryNumber);
        String paddedBinaryString = padBinaryString(binaryString);
        String hexadecimalString = convertToHexadecimal(paddedBinaryString);
        System.out.println("Hexadecimal representation: " + hexadecimalString);
    }

    // 将二进制字符串按照每四位进行分组并补齐
    private static String padBinaryString(String binaryString) {
        int paddingLength = (int) (Math.ceil(binaryString.length() / 4.0) * 4);
        return String.format("%" + paddingLength + "s", binaryString).replace(' ', '0');
    }

    // 将四位二进制数转换为对应的十六进制数
    private static String convertToHexadecimal(String binaryString) {
        StringBuilder hexadecimal = new StringBuilder();
        for (int i = 0; i < binaryString.length(); i += 4) {
            String fourBits = binaryString.substring(i, i + 4);
            int decimal = Integer.parseInt(fourBits, 2);
            hexadecimal.append(Integer.toHexString(decimal).toUpperCase());
        }
        return hexadecimal.toString();
    }
}