Web Reference: Jan 8, 2026 · In this short article, we saw a summary of the stream lifecycle to understand how peek () works. We also saw two everyday use cases when using peek () is the most straightforward option. We create a stream of Widget objects via Collection.stream(), filter it to produce a stream containing only the red widgets, and then transform it into a stream of int values representing the weight of each red widget. May 5, 2024 · Since Java 9, if the number of elements is known in advance and unchanged in the stream, the .peek () statement will not be executed due to performance optimization.
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