英文:
Is it a good practice to use Java Streams in POJO as attributes
问题
我刚第一次看到这个，我想知道这是不是一个好的做法，还是像往常一样，这取决于情况。
在域中将流（Streams）用作属性，而不是列表（List）。
public class MyDomain {
Integer id;
Stream<SubDomain> subDomains;
}
英文:
I just saw this for the first time and I would like to know if this is a good practice or as always it depends.
Using Streams as attributes in the domain instead of a List.
public class MyDomain {
Integer id;
Stream<SubDomain> subDomains;
}
答案1
得分: 10
不，这不是一个好的实践。流（Streams）的创建是为了支持对元素流进行函数式操作（详见官方 Javadoc），而不是为了将它们持久化。
在官方的 Javadoc 中还有另一个好的引用：
流与集合在几个方面不同：
没有存储。流不是存储元素的数据结构；相反，它通过计算操作的管道，从诸如数据结构、数组、生成器函数或I/O通道等来源传递元素。
因此，不要将其用作持久化集合。
英文:
No, that isn't a good practice. Streams have been created to support functional-style operations on streams of elements (see official Javadoc) but not to persist them.
The is an other good quote in the official Javadoc:
> Streams differ from collections in several ways:
> No storage. A stream is not a data structure that stores elements; instead, it conveys elements from a source such as a data structure, an array, a generator function, or an I/O channel, through a pipeline of computational operations.
So don't use it as a persistent collection.
答案2
得分: 8
这不是一个好主意，流（stream）只能被消耗（consumed）一次。将其作为对象字段将使得很可能需要多次消耗它。为了能够做到这一点，您需要存储集合类（例如一个 List），并在需要将其内容作为流访问时调用其 stream() 方法。
英文:
This is not a good idea, a stream can be consumed once. Having it as a field in an object will make it likely it is necessary to consume more than once. To be able to do that, you need to store the collection class (eg a List), and call its stream() method when you need to access its contents as a stream.
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