Declare variables in Java by choosing a data type such as int, String, Double, or Boolean, name your variable, and assign a value. Print with System.out.println() in VarDemo.

Explore how to use Java operators, including relational and logical operators, to build boolean expressions, compare numbers, and print true or false.

Implement a UDP client-server using datagram sockets, binding port 8088, handling datagram packets, and exchanging 'how are you' data via getByName() resolved IP and port.

Learn to create Java threads by extending Thread or implementing Runnable, override run, instantiate ThreadDemo, and start threads to observe asynchronous output printing 0–4 and 10–14 to the terminal.

Learn how to implement thread pooling with an executor service using newCachedThreadPool to run multiple tasks simultaneously. Achieve a clean shutdown after tasks complete.

Build an SSL client-server socket program over TCP/IP, configuring server and client keystores and truststores, and enabling cipher suites. Perform handshake, exchange certificates, exchange hello messages, and close the connection.

Learn to communicate with a proxy server and perform http requests through a socks proxy in Java by building a proxy client and testing with a Windows proxy.