This project implements a multithreaded client-server architecture for a key-value store. The server can handle multiple client connections concurrently using threads. Clients can send commands to the server to perform operations on the key-value store.

• Client: Connects to the server and sends commands to perform operations on the key-value store.
• Server: Listens for incoming connections from clients and handles requests concurrently using threads.
• Key-Value Store: Stores key-value pairs and supports various operations like SET, GET, DELETE, etc.

1. Server: Start the server by running the Server class with the desired port number as a command-line argument.

   Example: java Server 5000

2. Client: Run the Client class with the server's host address and port number as command-line arguments.

   Example: java Client localhost 5000

3. Commands: Use the following commands to interact with the server:

   • SET key value: Sets the value of the specified key.
   • SETX key value expiration_time Sets the value of the specified key and also sets an expiration time (in milliseconds)
   • GET key: Retrieves the value of the specified key.
   • DELETE key: Deletes the specified key-value pair.
   • INCREMENT key: Increments the value of the specified key if it's a number.
   • DECREMENT key: Decrements the value of the specified key if it's a number.
   • LPUSH key value: Pushes a value to the beginning of a list stored at the specified key.
   • RPUSH key value: Pushes a value to the end of a list stored at the specified key.
   • LLEN key: Gets the length of the list stored at the specified key.
   • SAVE filename: Saves the key-value store to a file.
   • LOAD filename: Loads the key-value store from a file.

• Java 8 or higher