Singleton Design Pattern is the most widely used pattern in all the programming languages (Java, Javascript, Python, etc)
Here's what it means in the simplest terms:
Here's what it means in the simplest terms:
1. Singleton design pattern ensures that a class has only one instance and provides a global point of access to that instance.
2. To implement the singleton pattern in Java, we need to create a class with a private constructor to prevent other classes from instantiating it.
We also need to create a static method that returns the instance of the class.
Eg:
We also need to create a static method that returns the instance of the class.
Eg:
3. This static method (`getInstance()` in above snippet) checks if an instance of the class already exists.
If it doesn't, it creates one and returns it.
If it already exists, it simply returns the existing instance.
If it doesn't, it creates one and returns it.
If it already exists, it simply returns the existing instance.
4. By doing this, we ensure that only one instance of the class is created and that all other classes can access it through the global point of access provided by the static method.
5. The singleton pattern is useful when we need to make sure that only one instance of a class exists, such as in cases where we need to manage resources or access shared data.
For eg:
1. You want to ensure your entire application only uses single DB connection.
2. You want to load class which is very heavy, so we can load it in singleton manner where it is getting initialized only one time and used everywhere. For eg: Logger classes to print logs.
1. You want to ensure your entire application only uses single DB connection.
2. You want to load class which is very heavy, so we can load it in singleton manner where it is getting initialized only one time and used everywhere. For eg: Logger classes to print logs.
That's a wrap!
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