Question

我有两套产品

public enum ProductType {

    FOUNDATION_OR_PAYMENT ("946", "949", "966"),
    NOVA_L_S_OR_SESAM ("907", "222");

    private String[] type;

    ProductType(String... type) {
        this.type = type;
    }
}

然后给定值“ actualProductType”，我需要检查它是否是productType的一部分..我该如何做..

isAnyProductTypes(requestData.getProductType(), ProductType.NOVA_L_S_SESAM)

 public boolean isAnyProductTypes(String actualProductType, ProductType productTypes) {
        return Arrays.stream(productTypes).anyMatch(productType -> productType.equals(actualProductType));
    }

我在这部分Arrays.stream（productTypes）遇到错误

Answer 1

由于您的枚举没有改变，因此可以在其中建立Map以便快速查找：

public enum ProductType {


    FOUNDATION_OR_PAYMENT("946", "949", "966"),
    NOVA_L_S_OR_SESAM("907", "222");

    static Map<String, ProductType> MAP;

    static {
        MAP = Arrays.stream(ProductType.values())
                    .flatMap(x -> Arrays.stream(x.type)
                                        .map(y -> new SimpleEntry<>(x, y)))
                    .collect(Collectors.toMap(Entry::getValue, Entry::getKey));
    }

    private String[] type;

    ProductType(String... type) {
        this.type = type;
    }

    public boolean isAnyProductTypes(String actualProductType, ProductType productTypes) {
        return Optional.ofNullable(MAP.get(actualProductType))
                       .map(productTypes::equals)
                       .orElse(false);
    }
}

Answer 2

您应该将类型更改为Set<String>，并将构造函数也更改为

ProductType(String... type) {
    this.type = new HashSet<>(Arrays.asList(type));
}

查找将非常简单

return productType.getType().contains(requestData.getProductType())

如何访问数组枚举

2 个答案: