What is the principle of implementation in Lombok?

Lombok is a Java library that simplifies the development of Java classes by generating code during compile time. Its implementation relies mainly on Java annotation processors.

When using Lombok, we utilize specific annotations in our Java classes, such as @Data, @Getter, @Setter, etc. These annotations are processed by Lombok’s annotation processor during compilation, automatically generating corresponding code based on the annotation’s definition.

When Java source code is compiled, the annotation processor reads the annotations in the source code and generates corresponding code based on the annotation definitions. For example, using the @Data annotation will automatically generate a class’s constructor, getter, setter methods, toString method, and more. The generated code is added to the compiled Java source file, and the resulting bytecode file will include the code generated by Lombok.

In this way, developers can use concise annotations to replace the tedious process of manually writing repetitive code, improving the readability and development efficiency of the code.

In conclusion, the implementation principle of Lombok is to read and process annotations at compile time using Java annotation processors, automatically generate code based on the annotation definition, simplifying the development of Java classes.