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Java Essential Training for Students

Improving your program with error handling

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

      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

    - When programming, it's really important to remember that you have to account for potential user errors. Most programming languages have code that helps handle unexpected errors. It provides the programmer control over the exception so they can provide meaningful messages and avoid program interruptions. This program reads a series of numbers from a text file. I created a text file in the IDE called "numbers.txt" and added a few numbers. The program is designed to read the numbers and at the end of file, it will calculate the average of the numbers. Let's take a look at the program and the error logic that I added for both any "Input File Errors" that might occur and any potential "Null Pointer Exceptions" that might occur. At the top of the program you can see I had to import the java.io to get the library that allows me to read and write from files and the java.util because I need to use the scanner object. Let's start by looking at line 17. We have our normal "public static void…

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Contents