[英]How to check if a Stream<String> contains another Stream<String> in Java 8
I created two Stream我创建了两个流
Stream<String> first= ...
Stream<String> second= ...
Both of them have numbers.他们俩都有号码。 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.
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?如果我将
second.toString()
替换为“10”,那么它可以工作,但是如何检查整个流而不仅仅是字符或字符串?
You need to collect the second
stream 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
Set
:
Set<String> secondSet = second.collect(Collectors.toSet());
List<String> f = first.filter(s -> secondSet.contains(s))
.collect(Collectors.toList());
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));
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