Threads and concurrency are important programming topics that allow our workstations, phones, etc. to handle multiple tasks simultaneously, both in terms of a single application doing several things...

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Concurrency introduction -
concurrency is the composition of independently executing processes.
Multi-threading or concurrent processing means performing more than one task at a time.
Concurrent processing is achieved by running more than one Thread in parallel.
Concurrency has three levels:
● Multiprocessing: Multiple Processors/CPUs executing concurrently.
● Multitasking: processes running concurrently on a single CPU. The OS executes these
tasks by switching between them.
● Multithreading: Multiple parts of the same program running together.
Thread Creation -
1) User class can implement Runnable interface and provide an implementation of run()
method. Contents inside the run() method are executed by a separate thread.
2) Extending Thread Class
Another way of creating a...