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What is the procedure for creating an Annotation member using JavaPoet?

asked 2023-07-15 06:34:14 +0000

ladyg gravatar image

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answered 2023-07-15 06:35:01 +0000

djk gravatar image

To create an Annotation member using JavaPoet, you can follow these steps:

  1. Create an instance of the AnnotationSpec.Builder class.
  2. Add the required attributes and values using the methods provided by AnnotationSpec.Builder.
  3. Build the AnnotationSpec instance using the build() method of AnnotationSpec.Builder.
  4. Create an instance of the FieldSpec.Builder class for the member that will have the Annotation.
  5. Add the AnnotationSpec instance as a modifier to the FieldSpec using the addModifiers() method of FieldSpec.Builder.
  6. Build the FieldSpec instance using the build() method of FieldSpec.Builder.

Here's an example code snippet that shows how to create an Annotation member using JavaPoet:

import com.squareup.javapoet.AnnotationSpec;
import com.squareup.javapoet.FieldSpec;
import com.squareup.javapoet.TypeName;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;

public class AnnotationExample {
    public static void main(String[] args) {
        // Create AnnotationSpec instance
        AnnotationSpec annotation = AnnotationSpec.builder(MyAnnotation.class)
                .addMember("value", "$S", "Hello World")
                .build();

        // Create FieldSpec instance with Annotation
        FieldSpec field = FieldSpec.builder(TypeName.INT, "myField")
                .addModifiers(Modifier.PRIVATE)
                .addAnnotation(annotation)
                .build();
    }
}

@Retention(RetentionPolicy.RUNTIME)
@interface MyAnnotation {
    String value();
}

In this example, we create an AnnotationSpec instance for an annotation named MyAnnotation with a single attribute named "value" that takes a string parameter. We then create a FieldSpec instance for an integer field named "myField" that is marked as private and has the Annotation we just created.

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Asked: 2023-07-15 06:34:14 +0000

Seen: 7 times

Last updated: Jul 15 '23