Using encapsulation

From the course: Learning Java 8

  • Course details

    Java is one of the top-five programming languages, and is used for websites, embedded controllers, and Android app development. This is an introduction to get you started programming with Java. Peggy Fisher introduces the basics: data types, strings, arrays, expressions, loops, and functions. She'll help you control the flow and logic of your code, and create classes using the principles of object-oriented design. Then go a bit beyond the basics and learn advanced techniques for working with arrays, manipulating files, and building graphical user interfaces (GUIs) that respond to user input. This three-hour capsule course is perfect for developers who need to get up to speed with Java fast, as well as for beginning programmers who want their first taste of this popular language.

    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

    - In object-oriented programming languages, you'll often hear the term encapsulation. Encapsulation ensures data integrity and reusability. Encapsulation is one of the benefits of using object-oriented programming languages. It allows the programmer to hide the definition of instance data and methods from the user. This ensures that data structures and operators are used as intended. Encapsulation can be described as a protective barrier that prevents the code and data from being randomly accessed by other code, defined outside the class. Let's think about a checking account. The balance is declared as private, so it can only be updated using a method. The withdraw method checks to make sure the balance is greater than the withdrawal amount prior to reducing the balance. This provides a way to make sure the customer cannot withdraw more money than what is in the account. Some banks might also charge a withdrawal fee. That logic would be included in the method as well. This is an example of encapsulation. For a more detailed explanation, please refer to Foundations of Programming: Object-Oriented Design with Simon Allardice, What is Encapsulation?

  • Practice while you learn with exercise files

    Download the files the instructor uses to teach the course. Follow along and learn by watching, listening and practicing.

    Download the exercise files for this course. Get started with a free trial today.

  • Download courses and learn on the go

    Watch courses on your mobile device without an internet connection. Download courses using your iOS or Android LinkedIn Learning app.

    Watch this course anytime, anywhere. Get started with a free trial today.

Contents