构造 ImmutableSortedSet 而不发出警告
我想要构造ImmutableSortedSet。我编写了如下代码 smt：
Set<String> obj = new HashSet<String>();
Comparator<String> myComparator = new Comparator<String>(){
@Override
public int compare(String o1, String o2) {
return 0;
}
};
Set<String> ordered = ImmutableSortedSet.copyOf(obj)
.orderedBy(myComparator).build();
但它会生成警告：
静态方法 orderBy(比较器) 来自 ImmutableSortedSet 类型应该 以静态方式访问
如何在没有 @SuppressWarnings("static-access") 的情况下删除此警告？谢谢。
I want construct ImmutableSortedSet. I wrote code smt like:
Set<String> obj = new HashSet<String>();
Comparator<String> myComparator = new Comparator<String>(){
@Override
public int compare(String o1, String o2) {
return 0;
}
};
Set<String> ordered = ImmutableSortedSet.copyOf(obj)
.orderedBy(myComparator).build();
but it generates warning:
The static method
orderedBy(Comparator) from the
type ImmutableSortedSet should
be accessed in a static way
How can I remove this warning without @SuppressWarnings("static-access")? Thanks.
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它向您发出该警告是因为
orderedBy是静态方法，并且您在ImmutableSortedSet的实例上调用它。这通常意味着你认为自己在做一件事，而实际上你在做另一件事，这里就是这种情况。结果是这段代码不会做你认为它会做的事情......它将丢弃由
copyOf(obj)创建的ImmutableSortedSet（它只是用于访问静态方法orderedBy，可以直接使用）并返回一个空集，就像您刚刚调用ImmutableSortedSet.orderedBy(myComparator).build()。这就是你想要做的（正如 R. Bemrose 所说）：
为了后代，这是我最初匆忙发布的内容（具有相同的结果）：
It's giving you that warning because
orderedByis a static method and you're calling it on an instance ofImmutableSortedSet. This often means you think you're doing one thing when really you're doing something else, and that's the case here.The result is that this code isn't going to do what you think it does... it's going to throw away the
ImmutableSortedSetcreated bycopyOf(obj)(it's only being used to access the static methodorderedBy, which could be used directly) and return an empty set, as if you had just calledImmutableSortedSet.orderedBy(myComparator).build().Here's what you want to do (as R. Bemrose said):
For posterity, here's what I hastily posted initially (which has the same result):
查看 Guava
ImmutableSortedSet文档后，您似乎实际上想要copyOf的其他重载之一。具体来说，您需要
copyOf(Comparator, Collection)重载：After looking at the Guava
ImmutableSortedSetdocs, it appears that you actually want one of the other overloads tocopyOf.Specifically, you want the
copyOf(Comparator, Collection)overload: