Что произойдет, если вместо ключевого слова 'class' использовать 'object'?

Using the keyword object instead of class in Kotlin creates a singleton object declaration.

• Creates a single instance of the class.
• Initialized lazily upon first access.
• Does not require calling a constructor.
• Can have properties, methods, and other members like a regular class.
• Used for implementing singletons, companion objects, or creating anonymous objects.

Example:

// Class declaration
class MyClass {
    // ...
}

// Object declaration (singleton)
object MySingleton {
    // ...
}

Access to object members is direct by the object name, without creating an instance:

// For MyClass, need an instance
val instance = MyClass()
instance.someMethod()

// For MySingleton, direct access
MySingleton.someMethod()