code: public BeanBox injectField(String fieldName, Object inject) {
  		BeanBox box = BeanBoxUtils.wrapParamToBox(inject);
  		checkOrCreateFieldInjects();
  		Field f = ReflectionUtils.findField(beanClass, fieldName);
  		box.setType(f.getType());
  		ReflectionUtils.makeAccessible(f);
  		this.getFieldInjects().put(f, box);
  		return this;
  	}
docs: Inject class, BeanBox class or instance,