如何模拟JobBuilderFactory？

public class MyJobBuilderFactory {
   private StepBuilderFactory stepBuilderFactory;

   public MyJobBuilderFactory(StepBuilderFactory stepBuilderFactory) {
      this.stepBuilderFactory = stepBuilderFactory;
   }

   public JobBuilder getJobBuilder(String jobName) {
      return new JobBuilder(jobName, stepBuilderFactory);
   }
}

public class JobBuilder {
   private String jobName;
   private StepBuilderFactory stepBuilderFactory;
   private List<Step> steps;

   public JobBuilder(String jobName, StepBuilderFactory stepBuilderFactory) {
      this.jobName = jobName;
      this.stepBuilderFactory = stepBuilderFactory;
      this.steps = new ArrayList<>();
   }

   public JobBuilder addStep(String stepName) {
      Step step = stepBuilderFactory.get(stepName)
                                    .tasklet(tasklet())
                                    .build();
      steps.add(step);
      return this;
   }

   public Job build() {
      // 构建Job实例
      return new Job(jobName, steps);
   }

   private Tasklet tasklet() {
      // 定义Step的处理逻辑
      return (contribution, chunkContext) -> {
         // 执行具体的任务
         return RepeatStatus.FINISHED;
      };
   }
}

StepBuilderFactory stepBuilderFactory = new StepBuilderFactory();
MyJobBuilderFactory jobBuilderFactory = new MyJobBuilderFactory(stepBuilderFactory);

Job job = jobBuilderFactory.getJobBuilder("myJob")
                           .addStep("step1")
                           .addStep("step2")
                           .build();