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Questions and Answers
What is the primary reason for controlling the number of instances a class has?
What is the limitation of using a regular constructor in implementing the Singleton pattern?
Which creational pattern is most suitable for controlling the number of instances a class has?
What happens when you try to create a new instance of a Singleton class after an instance already exists?
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Which of the following is an example of a shared resource that might require Singleton pattern implementation?
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What is the primary advantage of using a Singleton pattern in a class that accesses a shared resource?
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Which of the following patterns is most closely related to the Singleton pattern in terms of controlling the number of instances of a class?
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What is the key challenge in implementing the Singleton pattern using a regular constructor?
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Which of the following is a common use case for the Singleton pattern?
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What is the main difference between the Singleton pattern and the Factory Method pattern?
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Study Notes
Singleton Class
- A singleton class ensures that only one instance of the class exists.
- The main reason for controlling the number of instances is to control access to shared resources, such as databases or files.
Singleton Class Behavior
- Creating multiple objects from a singleton class will return the same instance, rather than creating a new one.
- This behavior cannot be achieved using a regular constructor, as it always returns a new object by design.
Singleton Class
- A singleton class ensures that only one instance of the class exists.
- The main reason for controlling the number of instances is to control access to shared resources, such as databases or files.
Singleton Class Behavior
- Creating multiple objects from a singleton class will return the same instance, rather than creating a new one.
- This behavior cannot be achieved using a regular constructor, as it always returns a new object by design.
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Description
Learn about the Singleton class in programming, its purpose, and how it works to control access to shared resources.
