Click here to watch in Youtube :
https://www.youtube.com/watch?v=6_6ytShUcJU&list=UUhwKlOVR041tngjerWxVccw
StreamDemo.java
https://sites.google.com/site/ramj2eev1/home/javabasics/StreamDemo_reuse_stream_exe.zip?attredirects=0&d=1
Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/StreamDemo_reuse_stream_exe
Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/adf72ea7a150b1a34af5820c19f2232b522614b9/BasicJava/StreamDemo_reuse_stream_exe/?at=master
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https://www.youtube.com/watch?v=6_6ytShUcJU&list=UUhwKlOVR041tngjerWxVccw
StreamDemo.java
import java.util.Optional; import java.util.stream.Stream; public class StreamDemo { public static void main(String[] args) { Stream<String> stream = Stream.of("a", "b", "c"); Optional<String> anyElement = stream.findAny(); System.out.println("anyElement = " + anyElement); /* * Attempt to reuse the same reference after calling the * terminal operation will trigger the IllegalStateException. * * As the IllegalStateException is a RuntimeException, a * compiler will not signalize about a problem. So, it is very * important to remember that Java 8 streams can’t be reused. * * This kind of behavior is logical because streams were * designed to provide an ability to apply a finite sequence * of operations to the source of elements in a functional * style, but not to store elements. */ Optional<String> firstElement = stream.findFirst(); System.out.println("firstElement = " + firstElement); } }Output
anyElement = Optional[a] Exception in thread "main" java.lang.IllegalStateException: stream has already been operated upon or closed at java.util.stream.AbstractPipeline.evaluate(Unknown Source) at java.util.stream.ReferencePipeline.findFirst(Unknown Source) at StreamDemo.main(StreamDemo.java:28)Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/StreamDemo_reuse_stream_exe.zip?attredirects=0&d=1
Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/StreamDemo_reuse_stream_exe
Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/adf72ea7a150b1a34af5820c19f2232b522614b9/BasicJava/StreamDemo_reuse_stream_exe/?at=master
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