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Advanced Java Programming

Implementing a LinkedHashMap

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] When using a normal HashMap there is no guarantee that you can get the entries back in the same order that you put them in. However, when you use a linked HashMap, the order of the entries is retained. In this example, I have a class called LinkedHashMap example with a main method in it. In the main method there is a linked HasMap called phonebook which has the contact's name as the key, and their phone number as the value. I have added four contacts called Kevin, Joe, Brenda, and Gary to the phonebook. After adding the contacts, I print out the value associated with the name Kevin. Finally, I have a for each loop that iterates over all of the entries in the map and prints out the key and the value for each one. With Linked HashMaps, you can specify if you want the elements to be retrieved in the order that they were added in, or in the order that they have been accessed in. To choose between these options, I need to alter the constructor I used when I created the…

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