- 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 main"…but now we've added something that says…
Author
Released
6/29/2015- Getting started with parsing
- Reviewing data types
- Using decisions
- Creating user-defined methods
- Command-line debugging
- Exploring the Java API
- Creating and instantiating classes
- Working with interfaces
- Storing items with arrays
Skill Level Intermediate
Duration
Views
Q: How can I make my debugger function like the author’s?
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Introduction
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Welcome58s
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1. Command Level Programming
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Challenge: Hello world1m 8s
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Solution: Hello world2m 22s
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2. Basics Review
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Reviewing data types4m 32s
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Using decisions2m 37s
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Managing loops4m 36s
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Challenge: College cost app1m 12s
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Solution: College cost app4m 23s
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3. Debugging
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Setting breakpoints1m 42s
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Stepping through the code4m 37s
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Command line debugging3m 50s
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Solution: Debugging5m 25s
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4. Java API
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Exploring the Java API3m 2s
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Challenge: API51s
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Solution: API2m 16s
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5. Simulations and Algorithm Analysis
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Using simulations3m 24s
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Random number generator3m 5s
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Analyzing algorithms4m 49s
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Leveraging recursion1m 59s
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Challenge: Monte Carlo2m 1s
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Solution: Monte Carlo3m 2s
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6. Classes and Objects
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Diagramming with UML1m 42s
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Creating classes7m 4s
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Using encapsulation1m 28s
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Instantiating classes7m 16s
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Avoiding null references4m 27s
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Challenge: Kathie's Catering2m 53s
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Solution: Kathie's Catering4m 41s
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7. More on Classes
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Introducing inheritance6m 35s
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Working with interfaces4m 30s
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Using polymorphism2m 14s
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Solution: Pizza ordering app3m 51s
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8. Data Structures
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Storing items with arrays4m 15s
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Utilizing 2D arrays3m 3s
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Managing ArrayLists5m 33s
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Enhanced for Loop5m 9s
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Challenge: Name finder1m 8s
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Solution: Name finder3m 42s
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Conclusion
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Next steps34s
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Video: Improving your program with error handling