Podcast
Questions and Answers
What is the primary reason for controlling the number of instances a class has?
What is the primary reason for controlling the number of instances a class has?
- To reduce memory allocation
- To increase application performance
- To improve code readability
- To control access to shared resources (correct)
What is the limitation of using a regular constructor in implementing the Singleton pattern?
What is the limitation of using a regular constructor in implementing the Singleton pattern?
- It must always return a new object (correct)
- It cannot return a null object
- It is only applicable to primitive data types
- It can only be used with abstract classes
Which creational pattern is most suitable for controlling the number of instances a class has?
Which creational pattern is most suitable for controlling the number of instances a class has?
- Builder Pattern
- Factory Method
- Abstract Factory
- Singleton Pattern (correct)
What happens when you try to create a new instance of a Singleton class after an instance already exists?
What happens when you try to create a new instance of a Singleton class after an instance already exists?
Which of the following is an example of a shared resource that might require Singleton pattern implementation?
Which of the following is an example of a shared resource that might require Singleton pattern implementation?
What is the primary advantage of using a Singleton pattern in a class that accesses a shared resource?
What is the primary advantage of using a Singleton pattern in a class that accesses a shared resource?
Which of the following patterns is most closely related to the Singleton pattern in terms of controlling the number of instances of a class?
Which of the following patterns is most closely related to the Singleton pattern in terms of controlling the number of instances of a class?
What is the key challenge in implementing the Singleton pattern using a regular constructor?
What is the key challenge in implementing the Singleton pattern using a regular constructor?
Which of the following is a common use case for the Singleton pattern?
Which of the following is a common use case for the Singleton pattern?
What is the main difference between the Singleton pattern and the Factory Method pattern?
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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