Example 01:

Learning Goals

• How to create a thread by extending the Thread class.
• How to start a thread using .start()
• How two threads (main thread + your custom thread) can run concurrently.
• How to set and get a thread's name

Concurrency: Both Main thread and GreetingThread are running at the same time — output may be interleaved.

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Example 02:

Learning Goals

• Creating a thread by implementing Runnable
• Showing Main thread and a custom thread running concurrently.
• Better design: Using Runnable lets you reuse your task code in other contexts (thread pools, etc.).
• Runnable interface separates task logic from thread creation.

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Extending Thread vs Implementing Runnable?

Both approaches are valid. However, implementing Runnable and passing an instance of the implementation to a Thread instance is often preferable. This approach allows better flexibility, particularly when working with thread pools.

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Example 03:

Learning Goals

• Use interrupt(), not stop().
• Check Thread.currentThread().isInterrupted() inside loops.
• Handle InterruptedException properly and reset the interrupted status.
• Graceful shutdown of threads is critical in real-world applications.
• When interrupted during sleep:
  • You re-set the interrupt flag (interrupt() again inside catch).
  • You can then break the loop and cleanly exit.

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Example 04:

Learning Goals

• join(): Blocks the calling thread until the specified thread completes. Essential for ensuring sequential execution when needed.
• You cannot restart a finished thread—calling start() on a terminated thread throws an IllegalThreadStateException.

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Example 05 and 06:

Objectives

• Implement a loader UI that provides feedback to users while background tasks are running.
• Ensure the background task runs concurrently without blocking the main execution flow.
• Use a hashing function to hash a list of passwords

Learning Goals

• Learn how to use Java Threads for background operations.
• Practice what you've learned in this session

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Additional Resources

• Java Concurrency and Multithreading
• Multithreading Benefits
• Concurrency vs. Parallelism
• Creating and Starting Java Threads
• What is SHA-256 Hashing in Java?