Singleton Interview Questions and Answers

A Singleton class is a class that can only have one instance at a time.

• It restricts the instantiation of a class to a single object.

• It provides a global point of access to that instance.

• It is often used in situations where a single object is required...read more

A Singleton ensures a class has only one instance and provides a global point of access to it.

• A Singleton class restricts instantiation to a single object.

• To make a Singleton non-clonable, override the clone() method and throw an exception.

• Example in...read more

Static is a keyword used to declare a variable or method that belongs to the class. Singleton is a design pattern that restricts the instantiation of a class to one object.

• Static members are accessed using the class name, while Singleton objects are ...read more

Yes, a singleton class is a class that can only have one instance created.

• Ensure the constructor is private to prevent external instantiation.

• Provide a static method to access the single instance.

• Use a static variable to hold the single instance.

• Exam...read more

Singleton services can be made multiton by maintaining a map of instances with unique keys.

• Create a map to store instances with unique keys

• Use a factory method to retrieve instances based on keys

• Ensure that only one instance is created per key

Thread safe singleton can be implemented using double-checked locking or synchronized block.

• Use double-checked locking to ensure only one instance is created.

• Use synchronized block to make sure only one thread can access the creation of instance at a...read more

Singleton and static are both design patterns used to create objects with global access, but they differ in their implementation.

• Singleton restricts the instantiation of a class to a single object, while static allows multiple instances.

• Singleton pro...read more