Java bin2hex如何处理负数转换

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public class Bin2HexWithNegativeNumbers {
    public static void main(String[] args) {
        byte[] signedBytes = new byte[]{-1, 2, 3, 4};
        byte[] unsignedBytes = toUnsignedByteArray(signedBytes);
        String hexString = bytesToHex(unsignedBytes);
        System.out.println("Hex string: " + hexString);
    }

    private static byte[] toUnsignedByteArray(byte[] signedBytes) {
        byte[] unsignedBytes = new byte[signedBytes.length];
        for (int i = 0; i < signedBytes.length; i++) {
            unsignedBytes[i] = (byte) (signedBytes[i] & 0xFF);
        }
        return unsignedBytes;
    }

    private static String bytesToHex(byte[] bytes) {
        StringBuilder sb = new StringBuilder();
        for (byte b : bytes) {
            sb.append(String.format("X", b));
        }
        return sb.toString();
    }
}

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