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This article mainly explains "the introduction and use of lombok". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "the introduction and use of lombok".

Introduction to lombok

Lombok is an artifact developed by java, using annotations to make entity class pojo and log slf4j operation particularly convenient.

How lombok is used

(1) to use the lombok tool in idea, you need to install the lombok plug-in. You can plugins search for lombok installation, otherwise, using lombok will report an error. (2) add dependencies to the pom file of the Java project and use annotations.

Introduction to annotations

(1) the @ Getter/@Setter annotation can automatically generate Get/Set methods for the property fields of a class.

Public class Pojo {@ Setter [@ Getter] (https://my.oschina.net/u/3288663) private String name; / / other code... }

(2) @ ToString annotation to generate a toString method for classes that use the annotation

@ ToStringpublic class Pojo {private String name;}

(3) @ EqualsAndHashCode annotation, which automatically generates equals and hashCode methods for classes that use it

@ EqualsAndHashCodepublic class Pojo {private String name;}

(4) @ NoArgsConstructor, @ RequiredArgsConstructor, @ AllArgsConstructor, these annotations automatically generate a parameterless constructor, a specified parameter constructor, and a constructor containing all parameters for the class, respectively.

@ NoArgsConstructor@AllArgsConstructor public class Pojo {private String name;}

(5) @ Data annotations are more useful, including the annotated set @ ToString,@EqualsAndHashCode, @ Getter of all fields and @ Setter, @ RequiredArgsConstructor of all non-final fields. The sample code can refer to the combination of the above annotations.

* @ see Getter* @ see Setter* @ see RequiredArgsConstructor* @ see ToString* @ see EqualsAndHashCode* @ see lombok.Value*/@Target (ElementType.TYPE) @ Retention (RetentionPolicy.SOURCE) public @ interface Data {/ * If you specify a static constructor name, then the generated constructor will be private, and * instead a static factory method is created that other classes can use to create instances * We suggest the name: "of", like so: * public @ Data (staticConstructor = "of") class Point {final int x, y;} * Default: No static constructor, instead the normal constructor is public. * * @ return Name of static 'constructor' method to generate (blank = generate a normal constructor). * / String staticConstructor () default "";}

(6) the @ Builder annotation uses the builder pattern to assign values to the parameters.

@ Builder public class Pojo {private String name;}

It is very convenient to use and meets the needs of daily work.

Thank you for your reading, the above is the content of "introduction and use of lombok". After the study of this article, I believe you have a deeper understanding of the introduction and use of lombok, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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