Lombok典型示例

public class ConsumptionResult {
    private BigDecimal cash;
    private BigDecimal coupon;
    private BigDecimal rebate;

    public ConsumptionResult() {
    }

    private ConsumptionResult(Builder builder) {
        this.cash = builder.cash;
        this.coupon = builder.coupon;
        this.rebate = builder.rebate;
    }

    public static Builder newBuilder() {
        return new Builder();
    }

    public BigDecimal getCash() {
        return cash;
    }

    public void setCash(BigDecimal cash) {
        this.cash = cash;
    }

    public BigDecimal getCoupon() {
        return coupon;
    }

    public void setCoupon(BigDecimal coupon) {
        this.coupon = coupon;
    }

    public BigDecimal getRebate() {
        return rebate;
    }

    public void setRebate(BigDecimal rebate) {
        this.rebate = rebate;
    }


    public static final class Builder {
        private BigDecimal cash;
        private BigDecimal coupon;
        private BigDecimal rebate;

        private Builder() {
        }

        public ConsumptionResult build() {
            return new ConsumptionResult(this);
        }

        public Builder cash(BigDecimal cash) {
            this.cash = cash;
            return this;
        }

        public Builder coupon(BigDecimal coupon) {
            this.coupon = coupon;
            return this;
        }

        public Builder rebate(BigDecimal rebate) {
            this.rebate = rebate;
            return this;
        }
    }
}

public ConsumptionResult getConsumption(@RequestParam("userId") String userId) {
    BigDecimal cash = ...
    BigDecimal coupon = ...
    BigDecimal rebate = ...
    return ConsumptionResult.newBuilder().cash(cash).coupon(coupon).rebate(rebate).build();
}

@Data
@Builder
public class ConsumptionResult {
    private BigDecimal cash;
    private BigDecimal coupon;
    private BigDecimal rebate;
}

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.16.6</version>
    <scope>provided</scope>
</dependency>