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Guidelines for Using Java 8 Features

Guidelines for Using Java 8 Features

Owned by Mahesh Rajaram Gawali
Jun 26, 2024
1 min read

1. Use of findFirst

Example: Optimizing Iteration with findFirst and Predicate

Optional<Channel> matchingChannel = channels.stream() .filter(c -> c.getConnectionId() != null && appAutomation.getConnectionId() != null && c.getConnectionId().equals(appAutomation.getConnectionId())) .findFirst(); // Use the matchingChannel if it is present matchingChannel.ifPresent(channel -> { // Perform actions with the found channel });

Explanation:

  • Use of stream() and filter():

    • Use the stream() method on your collection (channels in this case) to convert it into a stream.

    • Use the filter() method with a predicate to filter the elements based on the condition provided (c.getConnectionId().equals(appAutomation.getConnectionId())).

  • findFirst():

    • Use findFirst() to return an Optional containing the first element that matches the predicate. This method is short-circuiting, meaning it stops iterating further once it finds a matching element.

  • Handling the Result with Optional:

    • Use Optional to safely handle the result of findFirst(). If a matching channel is found, perform actions with it using ifPresent().

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