google guava list中的filter过滤器妙用

在guava库中，自带了过滤器(filter)的功能，能够用来对list进行转换

/**
     *@description 
     *     利用guava中集合filter 实现list的转换
     *@date 2016年11月3日 
     *@author kevin
     *@param entityList
     *@return
     *       poList
     */
    private List<StoryStyleDictionaryPo> entityListToPoList(List<StoryStyleDictionaryEntity> entityList){
        List<StoryStyleDictionaryPo> dto_list = null;
        if(entityList != null && !entityList.isEmpty()){
            // 方式一
            /*Function<StoryStyleDictionaryEntity, StoryStyleDictionaryPo> function = new Function<StoryStyleDictionaryEntity, StoryStyleDictionaryPo>() {
                
                @Override
                public StoryStyleDictionaryPo apply(StoryStyleDictionaryEntity input) {
                    StoryStyleDictionaryPo xbnAdminCompanyListDTO = new StoryStyleDictionaryPo();
                    //DTO内容copy制Bean对象中
                    BeanUtils.copyProperties(input,xbnAdminCompanyListDTO);
                    return xbnAdminCompanyListDTO;
                }
            };
            Iterable<StoryStyleDictionaryPo> transform = Iterables.transform(entityList, function);
            dto_list = Lists.newArrayList(transform);*/
            // // 方式二
            dto_list = Lists.newArrayList(Iterables.transform(entityList,new Function<StoryStyleDictionaryEntity, StoryStyleDictionaryPo>() {
                @Override
                public StoryStyleDictionaryPo apply(
                        StoryStyleDictionaryEntity input) {
                    //建立Bean对象
                    StoryStyleDictionaryPo xbnAdminCompanyListDTO = new StoryStyleDictionaryPo();
                    //DTO内容copy制Bean对象中
                    BeanUtils.copyProperties(input,xbnAdminCompanyListDTO);
                    return xbnAdminCompanyListDTO;
                }
            }));
        }
        return dto_list;
    }