设计模式解决多层if else代码冗余问题 - 直接上代码对比

    @Resource
    AbcServiceImpl abcServiceImpl;

    private Map<Integer,Function<Long,Integer>> actionMappings = new HashMap();

    @PostConstruct
    public void init(){
        //这里type应加枚举，此处举例没有用 1 2 3
        actionMappings.put(1,abcServiceImpl :: getASkuStock);
        actionMappings.put(2,abcServiceImpl :: getBSkuStock);
        actionMappings.put(3,abcServiceImpl :: getCSkuStock);
    }

    private Integer getASkuStock(Long skuId){
        return 1;
    }

    private Integer getBSkuStock(Long skuId){
        return 2;
    }

    private Integer getCSkuStock(Long skuId){
        return 3;
    }

    @Override
    public Object test(Integer type,Long skuId){
        if (type.equals(1)){
            return getASkuStock(skuId);
        } else if (type.equals(2)){
            return getBStock(skuId);
        } else {
            return getCWareSkuStock(skuId);
        }
    }

    @Override
    public Object test2(Integer type,Long skuId){
        Function<Long,Integer> function = actionMappings.get(type);
        if (function == null){
            log.error("查询失败");
            return 0;
        }
        return function.apply(skuId);
    }