它是在类型比较中发现不兼容类型的时候抛出的。
It is thrown as a result of incompatible types being found in a type comparison. The JVM specification says a that ClassCastException is.
结果克隆必须与原始实例具有相同的类型或是原始实例的兼容类型。
The resulting clone must be of the same type as or a compatible type to the original instance.
对输入或输出消息中的数据类型的大部分变更都不是向后兼容的。
Most changes to the data types in the input or output message are not backward compatible.
对于与复合状态兼容的每一种元数据类型，子状态机中的每一个转换都有一个限制策略。
For each metadata type compatible with a composite state, every transition in the sub-state machine has a policy for restriction.
对于这个场景，这些数据类型是兼容的。
For this particular scenario, these data types are compatible.
由于虚拟机将使用与主机相同的处理器作为基准，因此要求我们克隆的主机环境和物理服务器具有兼容的处理器类型。
Because the virtual machine will use the same processor as the host as a baseline, it requires that the host environment and the cloned physical server have compatible types of processors.
通常，问题归结到我们假设了类型是否具有兼容的范围。
Often, problems come down to assumptions about whether types have compatible ranges.
这一技术的功能极其强大；我们可以使几乎所有泛型类型的精度得到增强，但又与JVM保持兼容。
This technique is extremely powerful; we get almost all of the increased precision of generic types, but we maintain compatibility with the JVM.
这个结构必须包含数据类型与选择的字段兼容的字段。
This structure needs to have fields that have data types compatible with the selected fields.
确保两个cec上的系统处理器类型和型号是兼容的。
Ensure that the system processor type and modes on both the CECs are compatible.
对于创建外键，则需要另外一个具有主键的表，且该主键具有兼容的数据类型。
For foreign key creation, another table with a primary key with a compatible data type is required.
查询谓词中的数据类型与索引定义是兼容的。
The data type in the query predicate and the index definition are compatible.
表5列出了兼容的数据类型。
此外，表达式在分配时必须与变量数据类型兼容。
Also, the expression must be assignment-compatible to the variable data type.
如果列类型和数据内容是兼容的，那么就能够成功更改数据类型。
If the column type and the data content are compatible, the data type is successfully altered.
这两个组件可以凭借这种类型兼容的服务/引用来实现相互通信。
These two components could communicate with each other, across this type-compatible service/reference pair.
如果目标数据类型与实际数据不兼容，XMLCAST函数会引发错误。
The XMLCAST function can raise errors if the target data type is incompatible with the actual data.
总而言之，不要做向后不兼容的更改，如果非要做，就得改变媒体类型。
In a nutshell, don't make backwards-incompatible changes, and if you do, change the media type.
基本数据类型与另一个相同的基本数据类型兼容。
A base data type is compatible with another of the same base data type.
这种身份验证类型能与不支持DATA_ENCRYPT身份验证类型的低级产品兼容。
This authentication type allows for compatibility with down-level products not supporting the DATA_ENCRYPT authentication type.
在平台允许更改列数据类型的情况下，可用的数据类型预先填写有该平台的有效兼容数据类型，使类型选择更为容易。
In cases where the platform allows altering the column data type, the list of data types available is pre-filled with the valid compatible data types for that platform, making the type selection easy.
如果列的数据类型可以更改，则兼容数据类型的列表在每个列的数据类型下拉列表中自动列出。
In cases where the data type of a column can be altered, the list of compatible data types is automatically listed in the data type drop down for each column.
与ovc兼容的投票点应该包含几种类型的计算机工作站。
An OVC-compliant polling place would contain several types of computer stations.
新的数据类型必须与列的现有数据类型兼容(SQLSTATE 42837)。
The new data type must be compatible with the existing data type of the column (SQLSTATE 42837).
对兼容数据类型的NULL值的处理是完全相同的；对不兼容数据类型的 NULL 值的处理可能不相同。
NULL values of compatible data types are treated identically; those of non-compatible data types may not be.
这个行结构的类型需要与选择的字段的类型兼容。
The types of this row structure need to be compatible with the types of the corresponding fields that are selected.
在一些平台上， XMLCh与C类型 wchar_t兼容， 后者通常是两个——但是有时是四个——字节宽。
On some platforms it is compatible with the C type wchar_t, which is usually two -- but sometimes four -- bytes wide.
不同长度的CHAR和VARCHAR是兼容的数据类型。
CHAR and VARCHAR of different lengths are compatible data types.
内部格式用于DATE、TIME和TIMESTAMP数据类型。它们彼此都不兼容，且都不与CHAR兼容。
Internal formats are used for DATE, TIME, and TIMESTAMP data types and are not compatible with each other, and none are compatible with CHAR.
ALTERtable语句中的ALTERCOLUMNSETDATATYPE选项进行了扩展，可以支持所有兼容的类型。
The ALTER COLUMN SET DATA type option on the ALTER TABLE statement has been extended to support all compatible types.
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