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Advanced Java Programming

Using method references 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

  • Learn advanced Java programming

    - [Instructor] Method references are a shorthand way of writing a certain type of lambda expression. If you have a lambda expression that passes in a variable and then calls a method on that variable, you can replace it with a method reference. In this example, I have a class called square. This class has one private field of type int called side length. And a public calculate area method, which calculates the area by multiplying side length by side length. The constructor of the square class specifies that I have to pass in an int for the side length value. I also have a functional interface called shapes. This has a single abstract method called get area. Finally, I have a main class. In the main method of the main class, I create a new square object with a side length of four. Then, I implement the shapes interface and overrides the get area method using a lambda. Inside the lambda, I just return the result of calling the calculate area method on my square object. Finally, I have a…

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