Simply Singleton: The Singleton pattern is one of the simplest design patterns, but for Java developers, it’s full of pitfalls
The Single Java Object – A singleton is an class that can be instantiated once, and only once. This is a fairly unique property, but useful in a wide range of object designs.
The double-checked locking idiom – be used with the Singleton creation pattern to limit how much code is synchronized. However, it is not guaranteed to work. Instead of failing consistently, it will fail sporadically.
- Will every application use this class exactly the same way? (exactly is the key word)
- Will every application ever need only one instance of this class? (ever and one are the key words)
- Should the clients of this class be unaware of the application they are part of?
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