Lombok common notes

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One 、Lombok What is it?

Lombok It is a method to reduce code through annotation Java library , For example, reduce by annotation get,set Method , Construction method, etc .

Two 、 How to install

stay pom.xml Add the following dependencies to the file ：

<dependency>
	<groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <optional>true</optional>
</dependency>

3、 ... and 、 Commonly used annotations

annotation	explain
@Data	Annotation on class ; Providing all properties of the class getting and setting Method , It also provides equals、canEqual、hashCode、toString Method
@Setter	Comment on attribute ; Provide... For properties setting Method
@Setter	Comment on attribute ; Provide... For properties getting Method
@Log4j	Annotation on class ; Provide a... For the class Properties, log Of log4j Log object
@NoArgsConstructor	Annotation on class ; Provides a parameterless construction method for a class
@AllArgsConstructor	Annotation on class ; Provide a construction method of all parameters for the class
@Cleanup :	You can turn off the stream
@Builder	The annotated class adds a constructor pattern
@Synchronized	Add a synchrolock
@SneakyThrows	Equate to try/catch Capture exception
@NonNull	If you add this annotation to the parameter Parameter is null A null pointer exception will be thrown
@Value	Notes and @Data similar , The difference is that it will default all member variables to private final modification , And will not generate set Method .