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Java Essential Training for Students

Working with interfaces

From the course: Java Essential Training for Students

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  • Course details

    Taking a college-level programming course? Maximize your learning with these Java tutorials. Peggy Fisher explores command-level programming, basic techniques such as managing loops and creating methods, debugging Java code, working with classes and objects, and storing and sorting arrays. Along the way, she investigates the Java API and Java's capabilities for running simulations and algorithm analysis, and issues challenges to write programs that utilize all of these Java features.

    Instructor

    • Click here to view Peggy Fisher’s instructor page

      Peggy Fisher

      Lecturer at Penn State University

      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

    - The next topic I want to talk about is interfaces. An interface is like a contract between a class and the outside world. When a class implements an interface, it promises to provide the behavior included by that interface. Interfaces can also be used to store constants. This section defines a simple interface and explains the necessary changes for any class that implements it. As you've already learned, objects define their interaction with the outside world through the public methods used to get and set information. Methods form the object's interface with the outside world. The keys on your keyboard, for example, are the interface between you and the electrical wiring on the other side of its casing, which connects it to the computer. Also, the power button. When you press the power button on your computer, it turns the computer on or off. It's an interface. Most interfaces are a group of related methods with empty bodies. Let's use a bicycle as an example. A bicycle's behavior…

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