Learn about Java implementation of singleton patterns.
- [Instructor] A class that is based upon…a Singleton pattern restricts object creation…to a single instance of that class.…The print queue accessor class in your solutions model…simulates providing access to a print queue.…We'll assume that there is a requirement that…only one object has access to this queue.…After we create the class, we create a private static field…based on the queue interface.…We'll parametrize this to a string…and we'll call it hidden print queue.…In production, if we were developing a print queue,…we wouldn't parametrize it with string,…we'd have something like, a print job, or something…an object along those lines.…
But since we're really interested in learning about the…Singleton pattern, a string is sufficient…for teaching purposes.…Next, and this is the key, to a Singleton pattern,…we create a constructor and we label it, private.…Here in the comments we can see,…this restricts public access.…If we were to have additional constructors,…and there wouldn't be a reason to,…we would mark each of those private, also.…
- The IMQAV model
- Downloading software
- Installing and setting up a Java coding environment
- Mock tests
- Code coverage
- Using windows, views, and modes in IntelliJ IDEA
- Creating classes and attributes
- Creating constructors
- Casting variables
- Matching literals with regular expressions
- Regular expressions
- Design patterns
Skill Level Intermediate
Java: Database Integration with JDBCwith David Gassner2h 51m Intermediate
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NumPy Data Science Essential Trainingwith Charles Kelly3h 54m Intermediate
1. Getting Started with Java
2. Test-Driven Development
3. IntelliJ IDEA
4. Object-Oriented Java
6. Regular Expressions (Regex)
8. Design Patterns
9. Applying Data Science
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