Generatiing Enums with JCodeModel: https://blog.jensknipper.de/blog/generating-enums-in-java-with-jcodemodel/

EnumGenerator.java

package de.jensknipper.jcodemodel;

import com.helger.jcodemodel.*;

import java.io.File;
import java.io.IOException;

public class EnumGenerator {
    public static void main(String[] args) throws JCodeModelException, IOException {

        JCodeModel codeModel = new JCodeModel();

        JPackage jPackage = codeModel._package("de.jensknipper.jcodemodel");
        JDefinedClass jClass = jPackage._enum("ExampleEnumName");
        // DefinedClass jClass = codeModel._class("ExampleEnumName", EClassType.ENUM); // Alternative without package declaration

        JFieldVar field = jClass.field(JMod.PRIVATE + JMod.FINAL, String.class, "exampleField");

        JMethod getterMethod = jClass.method(JMod.PUBLIC, field.type(), "getExampleField");
        getterMethod.body()._return(field);

        JMethod constructor = jClass.constructor(JMod.NONE);
        JVar constructorParam = constructor.param(String.class, field.name());
        constructor.body().assign(JExpr.refthis(field), JExpr.ref(constructorParam));

        JEnumConstant jEnum = jClass.enumConstant("ENUM_1");
        jEnum.arg((JExpr.lit("enumFieldValue")));

        File file = new File("src/main/java");
        codeModel.build(file);

    }
}