Computer scienceProgramming languagesJavaCode organizationDesign patternsCreational patterns

Thread-safe singleton

On-demand initialization

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Which of the following is the correct way to implement a thread-safe singleton pattern using the "initialization-on-demand holder" technique?

Select one option from the list

Creating a singleton class with a public constructor, a static instance variable, and a static getInstance() method

Creating a singleton class with a private constructor and a static instance variable

Creating a singleton class with a private constructor, a static instance variable, and a static inner class

Creating a singleton class with a private constructor, and a static getInstance() method

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