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Java: Generic Classes

Challenge: Eliminate duplicates

From the course: Java: Generic Classes

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  • Course details

    Learn how to use Java generics to write cleaner and more robust code. Peggy Fisher walks through how to describe generics in Java and goes over syntax examples and type erasure. Peggy also covers the existing types of generic classes, interfaces, and methods, and shows how to create your own. Plus, at the conclusion of the course, she provides a hands-on challenge designed to help you practice and master what you learned.

    Instructor

    • Click here to view Peggy Fisher’s instructor page

      Peggy Fisher

      Content Strategist, Software Development Languages at Linkedin Learning Solutions with Lynda.com content

      Peggy Fisher is a programmer and content manager at LinkedIn Learning.

      Peggy's main focus is application programming in Java, Arduino, and C++. She has also worked on courses in COBOL and discrete ,athematics. Previously she was a faculty member at Penn State University's College of Information Sciences and Technology. She started out as a programmer working for a large insurance company, but after 18 years she left her job as a director of information technology to pursue her true passion teaching. She earned a master's degree in math education, and went on to teach high school math and computer science in Pennsylvania. In 2012, Peggy accepted a position as an instructional designer at Penn State, and shortly thereafter began teaching Intro to Application Programming with Java. She is a strong supporter of women in STEM. As one of the few female programming teachers, she serves as a mentor to incoming female freshmen who are considering a career in programming. She was also the K–12 outreach coordinator for the college, where she scheduled, ran, and taught summer camps for middle school and high school students. In a PBS NewsHour interview, she expressed that all students should take at least one programming class either in high school or college. Peggy enjoys constantly learning and finding new and exciting ways to bring technology to life in and outside of the classroom, such as using Arduino microcontrollers or Lego Mindstorms, to help make learning hands-on and fun.

    Skills covered in this course

  • Welcome

    - [Instructor] Welcome to your challenge. The objectives of this challenge include, creating a generic method, pass a generic ArrayList to this method, in the array list, eliminate any duplicates and create a new ArrayList and finally, return the new ArrayList without duplicates. For this particular challenge, I wanted to give you a little bit more information so I created a flowchart to walk through the process. At the top, you're going to start by creating a new list. Once you have the new list created inside your method, add the first element to the list, get the next element in the list, then check for duplicates in the new list. If a duplicate is found, go ahead and get the next element until you reach the end of the list. If no duplicate is found, then you want to add this to the new list and again, you want to go back up and get the next element if there are more elements that exist in the original list. I think the concept is not too difficult to understand. I do want to point…

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