java.lang.IllegalStateException: stream has already been operated upon or closed

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stream has already been operated upon or closed
java.lang.IllegalStateException: stream has already been operated upon or closed
at java.util.stream.AbstractPipeline.sourceStageSpliterator(AbstractPipeline.java:279)
at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:580)
at codermag.net.java8.StreamTestingClass.main(StreamTestingClass.java:15)

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