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 | |
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