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I'm developing a swing based application where I'm using many FileDialogs? So I say why not to make just one FileDialog object instead all of these instances and use it in the whole project? Is this a good assumption? does this have any performance improvement?
Thanks
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The most popular approach is to implement a Singleton by creating a regular class and making sure it has: A private constructor. A static field containing its only instance. A static factory method for obtaining the instance.
The Singleton's purpose is to control object creation, limiting the number of objects to only one. Since there is only one Singleton instance, any instance fields of a Singleton will occur only once per class, just like static fields.
It is used where only a single instance of a class is required to control the action throughout the execution. A singleton class shouldn't have multiple instances in any case and at any cost. Singleton classes are used for logging, driver objects, caching and thread pool, database connections.
In Java, Singleton is a design pattern that ensures that a class can only have one object. To create a singleton class, a class must implement the following properties: Create a private constructor of the class to restrict object creation outside of the class.
This is a great example of a use case where application performance doesn't really matter and the question actually falls into the premature optimization class of problem solving. Why? Using FileDialog means that you are interacting with the user who, even if skilled beyond skilled with shortcut key Kung Fu, will be many orders of magnitude slower than the application. How many FileDialogs could a speedy user open, use and close in one minute? Say a dozen. You should not need to care about a dozen objects coming and going in one minute. Shouldn't even appear on your radar. Use your energies elsewhere. In fact, you should create a new object every time and avoid any caching headaches.
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