如何在 Java 8 中检查 Stream<String> 是否包含另一个 Stream<String>
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How to check if a Stream<String> contains another Stream<String> in Java 8
提问by jimakos17
I created two Stream
我创建了两个流
Stream<String> first= ...
Stream<String> second= ...
Both of them have numbers. Let's say the first file has 1 to 1000 and the second one has 25 to 35. I'd like to check if the first one contains the numbers of the seconds one.
他们俩都有号码。假设第一个文件有 1 到 1000，第二个文件有 25 到 35。我想检查第一个文件是否包含秒数。
first.filter(s-> !s.contains(second.toString())
.collect(Collectors.toList());
If I replace second.toString()with "10" then it works but how can I check the whole stream and not only a char or a string?
如果我替换second.toString()为“10”，那么它可以工作，但是我如何检查整个流而不仅仅是一个字符或字符串？
回答by Jean Logeart
You need to collect the secondstream and store all its values in some adapted data strucutre.
您需要收集second流并将其所有值存储在一些适应的数据结构中。
For example using a Set:
例如使用一个Set：
Set<String> secondSet = second.collect(Collectors.toSet());
List<String> f = first.filter(s -> secondSet.contains(s))
.collect(Collectors.toList());
回答by ceyun
List<String> first = new ArrayList<String>();
List<String> second = new ArrayList<String>();
for (Integer i = 0; i < 100; i++) {
first.add(i.toString());
}
for (Integer i = 25; i < 36; i++) {
second.add(i.toString());
}
boolean result = second.stream().allMatch(
value -> first.stream().collect(Collectors.toList()).contains(value));
