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Java Essential Training for Students

Creating user-defined methods

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

    - Let's review the process of creating our own user-defined methods. A method is a group of statements used to accomplish a specific task. It is sometimes referred to as a black box and it helps to reinforce encapsulation. Methods can only return a single value or the method might not return anything. The return value from a method can be a primitive data type or a data structure. When a method does not return a value, it is considered a void method and the keyword void is put in the method header in place of the return type. When we write methods, any variables that are defined inside the method are considered local and only visible for the duration of the method body, starting with the open curly bracket and ending with the close curly bracket. To make a variable accessible to all methods in a class, you can declare them in the class but outside of any specific method and this is considered a global variable. By using methods, we are encapsulating the process used to update and…

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