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How to Create a Lazily Initialized Singleton in Java

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Here’s how to create a lazily initialized singleton in Java.

import java.time.LocalDateTime;

public final class MySingletonClass {

    private final LocalDateTime creationDateTime;

    private MySingletonClass(LocalDateTime creationDateTime) {
        this.creationDateTime = creationDateTime;
    }

    public LocalDateTime getCreationDateTime() {
        return creationDateTime;
    }

    public static MySingletonClass getInstance() {
        return InstanceHolder.INSTANCE;
    }

    private static final class InstanceHolder {
        static final MySingletonClass INSTANCE = new MySingletonClass(LocalDateTime.now());
    }
}

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