This example illustrates the use of concurrent threads to process multiple requests from a server. The server is a process that receives a request to compute the nth Fibonacci number, which it then computes and returns to the requestor.
You can run the Fibonacci Server from the command line as java fibonacci.FibonacciServer and you should do this from the appropriate directory where the binary files are.
To run the Fibonacci Client, you would similarly use java fibonacci.FibonacciClient.
You can run the programs using your IDE but it is easier to visualize the multithreaded behaviour from the command line.