public class CustomCheckedException extends Exception {
    private String errorCode;

    public CustomCheckedException() {
        super();
    }

    public CustomCheckedException(String message) {
        super(message);
    }

    public CustomCheckedException(String message, Throwable cause) {
        super(message, cause);
    }

    public CustomCheckedException(String errorCode, String message) {
        super(message);
        this.errorCode = errorCode;
    }

    public CustomCheckedException(String errorCode, String message, Throwable cause) {
        super(message, cause);
        this.errorCode = errorCode;
    }

    public String getErrorCode() {
        return errorCode;
    }
}

public void transferMoney(String fromAccount, String toAccount, BigDecimal amount) 
        throws CustomCheckedException {
    if (amount.compareTo(BigDecimal.ZERO) <= 0) {
        throw new CustomCheckedException("INVALID_AMOUNT", "转账金额必须大于零");
    }
    BigDecimal balance = accountRepository.getBalance(fromAccount);
    if (balance.compareTo(amount) < 0) {
        throw new CustomCheckedException("INSUFFICIENT_BALANCE", "账户余额不足");
    }
    // 执行转账逻辑
}

try {
    accountService.transferMoney("A", "B", new BigDecimal("100.00"));
} catch (CustomCheckedException e) {
    System.err.println("业务异常：" + e.getMessage());
    if (e.getErrorCode() != null) {
        System.err.println("错误码：" + e.getErrorCode());
    }
    // 可记录日志、返回前端提示、触发补偿流程等
}

INSUFFICIENT_BALANCE=您的账户余额不足，请充值后再试。
INVALID_AMOUNT=转账金额不合法，请输入正确的数值。