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6 Modules
Which of the following statements about the Singleton Pattern in Java is true?
A Singleton class can have multiple instances.
The Singleton Pattern ensures that a class has only one instance.
The Singleton Pattern is used to create a new instance every time it is called.
The Singleton Pattern can be implemented using an enum.
What is the primary purpose of using the Singleton Pattern?
To restrict instantiation of a class to a single object.
To allow multiple instances of a class.
To provide a global point of access to the instance.
To improve performance by caching instances.
Which of the following is a common implementation technique for the Singleton Pattern in Java?
Lazy Initialization
Eager Initialization
Thread-safe Singleton using synchronized method
Static Block Initialization
What is a potential drawback of using the Singleton Pattern?
It can lead to resource wastage.
It introduces global state into an application.
It makes unit testing difficult.
It is not thread-safe by default.
In a thread-safe Singleton implementation using double-checked locking, which of the following statements is correct?
The instance is created inside a synchronized block.
The instance is checked twice before creation.
The volatile keyword is not needed.
It prevents multiple threads from creating multiple instances.
6 Modules