get Field Descriptor
Convert field to field descriptor.
----------------转换字段为字段描述符。
getFieldDescriptor(String.class.getField("CASE_INSENSITIVE_ORDER")) -> "Ljava/lang/String;->CASE_INSENSITIVE_ORDER:Ljava/util/Comparator;"
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Return
field descriptor / 字段描述符
Parameters
field
field / 字段