依赖关系
luogw@luogw-mbp function$ ag 'import ' | awk 'BEGIN{FS=":"} {print $3}' | awk 'BEGIN{FS=" "} {print $2}' | awk 'BEGIN{FS=";"} {print $1}' | sort -u
java.util.Comparator
java.util.Objects通过import的关系，可知function依赖接口Comparator与Objects类
Objects类的职责是
This class consists of static utility methods for operating on objects. These utilities include null-safe or null-tolerant methods for computing the hash code of an object, returning a string for an object, and comparing two objects.