Exercise 1: Basic Singleton Implementation Objective: Implement a basic Singleton Pattern. Steps: Create a Logger class that follows the Singleton Pattern. Ensure only one instance of Logger is created. Add a method log(String message) to log messages.

Exercise 2: Thread-Safe Singleton Objective: Implement a thread-safe Singleton. Steps: Modify the Logger class to make it thread-safe. Use the double-checked locking principle to ensure thread safety. Demonstrate logging from multiple threads.

Exercise 3: Lazy Initialization Objective: Implement Singleton with lazy initialization. Steps: Create a DatabaseConnection class that follows the Singleton Pattern with lazy initialization. Ensure the instance is created only when needed. Add a method connect() to simulate database connection.

Exercise 4: Singleton with Enum Objective: Implement Singleton using an enum. Steps: Create an enum Configuration that follows the Singleton Pattern. Add methods to set and get configuration values. Demonstrate setting and getting configuration values.

Exercise 5: Serialization and Singleton Objective: Ensure Singleton property during serialization. Steps: Create a Settings class that follows the Singleton Pattern. Ensure the Singleton property is maintained during serialization and deserialization. Demonstrate serialization and deserialization of Settings.

Exercise 6: Singleton and Reflection Objective: Protect Singleton from reflection attacks. Steps: Create a Preferences class that follows the Singleton Pattern. Protect the Singleton instance from being instantiated via reflection. Demonstrate the protection mechanism.

Exercise 7: Singleton in Multithreading Environment Objective: Implement a Singleton for a multi-threaded environment. Steps: Create a Cache class that follows the Singleton Pattern. Ensure the Cache class works correctly in a multi-threaded environment. Add methods to add and retrieve items from the cache.

Exercise 8: Singleton in Dependency Injection Objective: Integrate Singleton with a dependency injection framework. Steps: Choose a dependency injection framework (e.g., Spring). Create a ServiceManager class that follows the Singleton Pattern. Integrate ServiceManager with the chosen dependency injection framework. Demonstrate the injection of ServiceManager into a client class.

Exercise 9: Singleton with Bill Pugh Method Objective: Implement Singleton using Bill Pugh Singleton Design. Steps: Create a ResourceManager class that follows the Singleton Pattern using Bill Pugh Singleton Design. Ensure thread safety and lazy initialization. Demonstrate accessing the ResourceManager instance.

Exercise 10: Test Singleton Pattern Objective: Write unit tests for Singleton implementation. Steps: Choose a Singleton class (e.g., Logger). Write unit tests to ensure only one instance of the class is created. Write tests to ensure thread safety and correct behavior of methods