英文:
How to deal with Unsafe null type conversion
问题
我有一段代码，其中 "Currencies" 是枚举，"Currency" 是实体：
public final Map<Currencies, Currency> currencies = new EnumMap<>(Currencies.class);
但是 Eclipse 生成了一个警告：
Unsafe null type conversion (type annotations):
The value of type '@NonNull EnumMap<TestDataServiceImpl.@NonNull Currencies,Currency>'
is made accessible using the less-annotated type 'Map<TestDataServiceImpl.Currencies,Currency>',
corresponding supertype is 'Map<TestDataServiceImpl.@NonNull Currencies,Currency>'
处理它的正确方式是什么？我是否应该使用 Optional 包装我的 map？这是强制性的吗？我应该忽略这个警告吗？因为我知道不会有空的情况。
英文:
I have a part of a code where "Currencies" is Enum and "Currency" is Entity:
public final Map<Currencies, Currency> currencies = new EnumMap<>(Currencies.class);
But Eclipse generates a warning:
Unsafe null type conversion (type annotations):
The value of type '@NonNull EnumMap<TestDataServiceImpl.@NonNull Currencies,Currency>'
is made accessible using the less-annotated type 'Map<TestDataServiceImpl.Currencies,Currency>',
corresponding supertype is 'Map<TestDataServiceImpl.@NonNull Currencies,Currency>'
What is the right way to handle it? Should I wrap my map with Optional? Is it mandatory? Should I ignore the warning as I know there will be no null case?
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