因此，这个过滤器只允许数值char，而会丢弃换行字符。
Thus, the filter only allows in chars that are numeric digits, discarding the newline characters.
赋值参数映射允许您指定一个常数值来放在目标参数中。
An assign parameter mapping lets you specify a constant value to put in a target parameter.
ChoiceFormat并不会真正帮助您格式化数值，但它的确允许您自定义与某个值关联的文本。
ChoiceFormat doesn't really help you format Numbers, but it does allow you to customize the text associated with a value.
应用推荐