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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.
Lecturer at Penn State UniversityPeggy 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
- When working with objects, we need to understand how to test for a null reference, which is exactly what it sounds like, a reference to nothing: null. This happens when you create an object which creates a variable name and an address where the data will reside but it is not then instantiated. Do you remember what the keyword was for instantiation? I hope you said new. That's correct. For example, if we wanna create an employee object but we didn't instantiate an address for this employee, the address would have a value of null. Let's see what this looks like. Let's say we add the address object for the third employee but we're not sure what it is yet, so we just set it equal to null for now, figuring we'll come back and fix it later. Now we're going to go ahead and create the third employee, so I do Employee ee3 = new Employee and this new employee is Jane Smith, and this is her phone number: 510-555-1212 and her address is a3, and her employee ID is 456789 and finally, she's in…
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