Initializing the state of an object: The init method is used to initialize the state of an object, including assigning values to member variables and creating the object, ensuring that the object is in a usable state before it is used.
Perform necessary setup: the init method can be used to perform essential setup operations such as connecting to the database, loading configuration files, and initializing threads.
Registering a listener: The init method can be used to register a listener, so that notifications can be received when the object’s state changes.
Performing initialization and cleanup of resources: The init method can be used to perform operations such as opening and closing files, connecting to servers, in order to initialize or cleanup resources.
Start threads: the init method can be used to start threads, ensuring that the object can run normally during use.
Performing validation and checking: the init method can be used to perform validation and checking operations, such as checking the validity of incoming parameters, validating object states, and so on.