Naming of packages and classes -- introduction to the differences between service tool util

Service tool util is often confused when naming and positioning packages and classes. Let’s analyze their positioning here:

Name	Features and positioning	Independence	Methods and class attributes
util	It is universal and has nothing to do with business. It can be independent and can be used by other projects.	Does not call any business-related classes	Methods are usually public static and generally have classless attributes. If there are any, they are also public static.
tool	is related to certain businesses and has limited versatility. Between several business classes	To call certain business-related classes	methods are usually public static, and generally have no class attributes. If there are, they are also public static
service	Related to a certain business, not universal	To call certain business-related classes	methods are usually public, It is usually called through an interface, which generally has public class attributes. You need to use new

when using it.

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