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I understand why the following code is ok. Because the collection is being modified before calling the terminal operation.
List<String> wordList = ...;
Stream<String> words = wordList.stream();
wordList.add("END"); // Ok
long n = words.distinct().count();
But why is this code is not ok?
Stream<String> words = wordList.stream();
words.forEach(s -> if (s.length() < 12) wordList.remove(s)); // Error—interference
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In Java8 Streams, performance is achieved by parallelism, laziness, and using short-circuit operations, but there is a downside as well, and we need to be very cautious while choosing Streams, as it may degrade the performance of your application.
With Java 8, Collection interface has two methods to generate a Stream. stream() − Returns a sequential stream considering collection as its source. parallelStream() − Returns a parallel Stream considering collection as its source.
There are a lot of benefits to using streams in Java, such as the ability to write functions at a more abstract level which can reduce code bugs, compact functions into fewer and more readable lines of code, and the ease they offer for parallelization.
Stream.forEach() is a terminal operation, and the underlying wordList collection is modified after the terminal has been started/called.
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