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Advanced Java Programming

Understanding streams in Java

From the course: Advanced Java Programming

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  • Course details

    Want to get more out of the Java language and platform? In this platform- and framework-neutral course, instructor Bethan Palmer digs into some of the language’s more advanced features, helping you expand your programming skills as she equips you with techniques you can use when building applications anywhere Java is used: in web, mobile, and desktop applications. Bethan covers a variety of topics, including generics, working with the Collections Framework, and functional programming. Plus, learn about I/O in Java, working with files and directories, and structuring applications using the modular system available in Java.

    Instructor

    • Click here to view Bethan Palmer’s instructor page

      Bethan Palmer

      Software Developer and Java Champion

      Bethan Palmer is a developer who loves technology and has a master's degree in computer science.

      For her day job, Bethan is a Java programmer and the product manager for a Java PDF library at IDRsolutions. She gets to spend a lot of time writing and refactoring code, as well as deciding on product strategy and road maps.

      She also spends much of her time attending conferences and is a regular speaker at Oracle Code One and NetBeans Days. She manages and writes articles about Java, technology, the books she's reading, and conferences she's attending on the Java PDF blog.

    Skills covered in this course

    For each course you will get

    • Exercise files and quizzes
    • Certificate of completion from LinkedIn
    • Offline and audio-only options
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  • Learn advanced Java programming

    - [Instructor] Streams provide a clean and simple way to iterate over a collection in Java. Instead of using a forEach loop, streams allow functional programming techniques to be used. These streams are not to be confused with input and output streams which are something completely different. For example, this is a forEach loop, which iterates over a collection of books. If the author of the book's name begins with the letter J, then the two-string method of book is called and printed to the terminal. When I use a forEach loop like this in Java, it uses something called external iteration. What actually happens under the hood is an iterator object is created. The iterator object controls the iteration process. For each item in the collection, it checks if the book's author begins with J. If it does, it goes to the print statements. And if not, then it does nothing. Then it checks if there is a next item in the collection. If there is, then it calls the next method to move to the next…

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Contents