如何在最终编译之前使用java注释修改源代码？

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Retention(RetentionPolicy.SOURCE)
@Target({ElementType.TYPE, ElementType.METHOD})
public @interface ModifySource {
}

import javax.annotation.processing.*;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.Element;
import javax.lang.model.element.TypeElement;
import javax.tools.Diagnostic;
import java.util.Set;

@SupportedAnnotationTypes("com.example.ModifySource")
public class ModifySourceProcessor extends AbstractProcessor {

    @Override
    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
        for (Element element : roundEnv.getElementsAnnotatedWith(ModifySource.class)) {
            // 在这里修改源代码
            processingEnv.getMessager().printMessage(Diagnostic.Kind.NOTE, "Modifying source code for: " + element);
        }
        return true;
    }

    @Override
    public SourceVersion getSupportedSourceVersion() {
        return SourceVersion.latestSupported();
    }
}

@ModifySource
public class ExampleClass {

    @ModifySource
    public void exampleMethod() {
        // ...
    }
}

javac -processor com.example.ModifySourceProcessor ExampleClass.java