请给出详细示例，以java代码为例

好的，下面是一个简单的Java代码示例来生成ARQC：

import javax.crypto.*;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.*;
import java.util.Arrays;

public class ARQCGenerator {
    private static final String ARQC_ALGORITHM = "DESede/CBC/NoPadding";
    private static final String DEK_ALGORITHM = "DESede";

    public static void main(String[] args) throws Exception {
        // 生成随机的DEK密钥
        KeyGenerator keyGenerator = KeyGenerator.getInstance(DEK_ALGORITHM);
        SecretKey dekKey = keyGenerator.generateKey();

        // 生成随机的IV向量
        SecureRandom random = SecureRandom.getInstanceStrong();
        byte[] iv = new byte[8];
        random.nextBytes(iv);

        // 生成ARQC
        String arqc = generateARQC("1234567890123456", 1000, dekKey, iv);

        System.out.println("ARQC: " + arqc);
    }

    public static String generateARQC(String pan, int amount, SecretKey dekKey, byte[] iv) throws Exception {
        // 计算ARQC的数据
        byte[] data = calculateARQCData(pan, amount, iv);

        // 加密数据得到ARQC
        Cipher cipher = Cipher.getInstance(ARQC_ALGORITHM);
        cipher.init(Cipher.ENCRYPT_MODE, dekKey, new IvParameterSpec(iv));
        byte[] arqcBytes = cipher.doFinal(data);

        // 将ARQC转换为十六进制字符串并返回
        return bytesToHexString(arqcBytes);
    }

    private static byte[] calculateARQCData(String pan, int amount, byte[] iv) throws Exception {
        // 计算ARQC的数据，包括PAN、交易金额和IV向量的哈希值
        MessageDigest md = MessageDigest.getInstance("SHA-256");
        byte[] panBytes = pan.getBytes(StandardCharsets.UTF_8);
        byte[] amountBytes = String.format("%012d", amount).getBytes(StandardCharsets.UTF_8);
        byte[] data = Arrays.copyOf(panBytes, panBytes.length + amountBytes.length + iv.length);
        System.arraycopy(amountBytes, 0, data, panBytes.length, amountBytes.length);
        System.arraycopy(iv, 0, data, panBytes.length + amountBytes.length, iv.length);
        byte[] hash = md.digest(data);

        // 取哈希值的前8个字节作为ARQC的数据
        return Arrays.copyOf(hash, 8);
    }

    private static String bytesToHexString(byte[] bytes) {
        StringBuilder sb = new StringBuilder();
        for (byte b : bytes) {
            sb.append(String.format("%02X", b));
        }
        return sb.toString();
    }
}

以上代码演示了如何生成一个ARQC，其中用到了3DES加密算法和SHA-256哈希算法。注意，这只是一个简单的示例，实际使用中还需要考虑更多的安全因素。