在开发场景，有许多if else 判断，赋值操作，通过策略模式简单化操作

优化前

   //优惠券类型
                Integer couponType = couponDTO.getCouponType();
                if (couponType == 1) {
                    couponDTO.setCouponTypeName("折扣券");
                } else if (couponType == 2) {
                    couponDTO.setCouponTypeName("满减券");
                } else if (couponType == 3) {
                    couponDTO.setCouponTypeName("满返券");
                } else if (couponType == 5) {
                    couponDTO.setCouponTypeName("抵现券");
                } else if (couponType == 6) {
                    couponDTO.setCouponTypeName("兑换券");
                }
                BigDecimal faceAmount = couponDTO.getFaceAmount();
                if (couponDTO.getCouponType() == 1) {
                    couponDTO.setFaceAmount(faceAmount == null
                            ? BigDecimal.valueOf(0.00) : faceAmount.multiply(new BigDecimal("10")));
                }

优化后

枚举

public enum CouponTypeEnum {
    //卡卷类型：1折扣券，2满减券,3返利券，5现金券，6兑换券
    DISCOUNT(1, "折扣卷"),
    FULL(2, "满减劵"),
    REBATE(3, "返利劵"),
    CASH(5, "现金券"),
    EXCHANGE(6, "兑换券");

    CouponTypeEnum(Integer code, String text) {
        this.code = code;
        this.text = text;
    }

    private final Integer code;
    private final String text;

    public Integer getCode() {
        return code;
    }

    public String getText() {
        return text;
    }

    // 未匹配上，则返回默认的策略defaultItem
    public static String match(Integer code){
        if (code != null) {
            for (CouponTypeEnum item: CouponTypeEnum.values()) {
                if (item.code.equals(code)) {
                    return item.text;
                }
            }
        }
        return null;
    }
//    public String getTextByCode(Integer code) {
//        return this.getText()
//    }

}

使用

   //优惠劵
                assetCouponResDTO.setCouponTypeName(CouponTypeEnum.match(assetCouponResDTO.getCouponType()));

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