When an encoded input byte sequence cannot be converted to a decoded output character 当编码的输入字节序列无法转换为解码的输出字符时引发
If an encoded input byte sequence cannot be converted to a decoded output character 如果已编码的输入字节序列无法转换为已解码的输出字符,则引发
Provides a failure - handling mechanism , called a fallback , for an encoded input byte sequence that cannot be converted to an output character 为不能转换为输出字符的已编码输入字节序列提供失败处理机制(称为“撤退” ) 。