public final class Assert {    private Assert() {    }    public static void notNull(Object object) {        if (object == null) {            throw new ApiRuntimeException(ErrorCode.SYSTEM_PARAM_ERROR_IS_NULL);        }    }    public static void notNull(Object... object) {        for (Object obj : object) {            if (obj == null) {                throw new ApiRuntimeException(ErrorCode.SYSTEM_PARAM_ERROR_IS_NULL);            }        }    }    public static void isPositive(Long number) {        if (number == null || number <= 0) {            throw new ApiRuntimeException(ErrorCode.SYSTEM_PARAM_ERROR);        }    }    public static void isPositive(Long... number) {        for (Long num : number) {            if (num == null || num <= 0) {                throw new ApiRuntimeException(ErrorCode.SYSTEM_PARAM_ERROR);            }        }    }    public static void isPositive(Integer number) {        if (number == null || number <= 0) {            throw new ApiRuntimeException(ErrorCode.SYSTEM_PARAM_ERROR);        }    }    public static void isPositive(Integer... number) {        for (Integer num : number) {            if (num == null || num <= 0) {                throw new ApiRuntimeException(ErrorCode.SYSTEM_PARAM_ERROR);            }        }    }    public static void notEmpty(String str, ErrorCode errorCode) {        if (StringUtils.isEmpty(str)) {            throw new ApiRuntimeException(errorCode);        }    }    public static void notBlank(String str, ErrorCode errorCode) {        if (StringUtils.isBlank(str)) {            throw new ApiRuntimeException(errorCode);        }    }    public static void isTrue(boolean condition, ErrorCode errorCode) {        if (!condition) {            throw new ApiRuntimeException(errorCode);        }    }}

断言类，用来在业务类之前判断参数。